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1. L2 M6 M4 ox A M1 1 m Bi max T disp i gt 1 X QU ont le T3 2 B1 US plug for uet T8 M9 A ext servo press Tim X3 M5 E Servo press external M2 Servo Bp Pressure x internal oe L1 EE M7 X1 M8 51000028 Fig 10 34 EP and EQ Control Schematic 10 12 Series 51 Electrohydraulic Proportional Control Types EP and EQ This control consists of a valve block and PCP Pres sure Control Pilot valve mounted on the multi func tion block The valve block incorporates a pilot piston with centering springs A pin transmits force from the pilot piston to the control spool in the end cap Feedback springs single spring for 060 080 and 110 and a threshold spring are installed in the end cap These springs function similar to the HS control Servo pressure may be supplied from an external source or internally by the shuttle spool in the multi function block PCOR is available with this control An external pilot pressure source is connected to the inlet of the PCP valve which produces differential pilot pressures proportional to the current through it These pressures are applied to the pilot piston The operation of this control is similar to that of the HP Control with the motor displacement being propor tional to the current through the PCP valve An incre
2. Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Control Orifices Orifices are installed in the motor end cap to regulate oilflowtothe servo control valve andthe servo piston To gain access to these orifice plugs remove the three 3 plugs located on the motor end cap nearest the multi function block or control using a 716 or 9 16 hex wrench Remove the orifice plugs plain plugs for N2 control with a3 mm internal hex wrench Install the orifice plugs and torque to 4 Nm 35 inelbsf Torque the 5 16 outer plugs to 9 Nm 7 ft Ibsf and the 9 16 outer plug to 37 Nm 27 ftelbsf Orifices are also installed in the servo control valve sleeve to control oil flow from the servo piston to the motor case Plug Fitting Torques If any plugs or fittings are removed from the unit during servicing they should be torqued as indicated in the accompanying table Pressure Gauge Ports 37 Nm 9 16 18 O Ring Hex 27 ftelbsf Construction Plugs 20 Nm 9 16 18 O Ring Int Hex 15 ft Ibsf Construction Plugs 9 Nm 5 16 24 O Ring 7 ftelbsf Screw Plugs 4 Nm M6 Int Hex 35 inslbsf Fig 50 145 Servo Fig 50 146 Servo Pressure Supply Orifice for Maximum Orifice T1 Displacement T2 Fig 50 147 Servo Fig 50 148 Servo Orifice for Minimum Drain Orifices T7 Displacement T3 and T8 50 27 SAUER SUNDSTRAND 6 e
3. Install the seal lock nut and torque to 19 Nm 14 ftelbsf Servo Pressure Shuttle Valve Remove the servo pressure shuttle plug with an 11 6 hex wrench Remove the shuttle ball seat with a 5 mm internal hex wrench and remove the ball Install the servo pressure shuttle ball Install the shuttle ball seat and torque to 11 Nm 8 ftelbsf Install the shuttle passage plug and torque to 37 Nm 27 ftelbsf Control Pressure Shuttle Valve Remove the shuttle spool plugs with a 1 4 internal hex wrench Remove the control pressure shuttle spool Install the control pressure shuttle spool Install the shuttle spool plugs and torque to 20 Nm 15 ftelbsf SAUER SUNDSTRAND Bent Axis Variable Displacement Motors CONTENTS aaa Series 51 Minor Repair and Replacement Variable Motor Continued Pilot Piston and Control Housing Thoroughly clean external surfaces prior to disas sembly of control Remove the four 4 screws retaining the cover to the control housing with a 4 mm internal hex wrench Remove the housing cover and gasket with the adjusting screw and seal lock nut Remove the control start adjustor spring seat and spring from the pilot piston Remove the pilot piston from the control housing Remove the pilot piston pin seat and pin from the control housing or pilot piston Remove the control start spring from the control housing Remove the four 4 screws and washers
4. 50 22 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors s oe Series 51 Minor Repair and Replacement Variable Motor Continued Blocking Plate for Multi function Block Without PCOR The blocking plate may be removed by removing the four 4 screws with a 5 mm internal hex wrench Remove the O rings from the plate Install new O rings on the blocking plate and retain with petroleum jelly Install the plate on the multi function block and install the screws Torque the screws to 11 Nm 8 ftelbsf Pressure Compensator Valve for Pressure Compensator Over Ride PCOR and Pressure Compensator Regulator Type PC Loosen the adjusting screw lock nut with a 1 1 16 hex wrench Remove the adjusting screw from the valve block with a large screwdriver Remove the pressure compensator valve spring and the spool assembly from the block Remove the valve block plug with a 1 hex wrench Remove the four 4 screws retaining the valve block to the multi function block with a 5 mm internal hex wrench Remove the valve block and O rings Install new O rings on the pressure compensator valve block and retain with petroleum jelly Install a new O ring on the adjusting screw The plugs on the valve block may be removed with a 7A6 hex wrench When reinstalling torque the 5 16 plugs to 9 Nm 7 ftelbsf a Am 000 Fig 50 124 Remove Fig 50 125 Torque Blocking Plate Less Blo
5. Bent Axis Variable Displacement Motors Series 51 Notes 50 28 SAUER SUNDSTRAND 6 Bent Axis Variable Displacement Motors Series 51 Notes SAUER SUNDSTRAND 5 Hydraulic Power Systems SAUER SUNDSTRAND Hydraulic Power Systems Market Leaders Worldwide SAUER SUNDSTRAND is a world leader in the design and SAUER SUNDSTRAND specializes in integrating a full manufacture of Hydraulic Power Systems Research and range of system components to provide vehicle designers development resources in both North America and Europe with the most advanced total design system enable SAUER SUNDSTRAND to offer a wide range of design solutions utilizing hydraulic power system SAUER SUNDSTRAND is Your World Source for technology Controlled Hydraulic Power Systems Heavy Duty Axial Piston Pumps and Motors Heavy Duty Bent Axis Cartridge Motors Variable Motors Compact Wheel Drives 239 P Medium Duty Axial Piston Pumps and Motors Microcontrollers and Hydrostatic Transmission Electrohydraulic Controls Packages Open Circuit Axial Piston Pumps Gear Pumps and Motors Worldwide Service Support SAUER SUNDSTRAND provides comprehensive worldwide service for its products through an extensive network of Authorized Service Centers strategically located in all parts of the world Genuine Parts Original Ersatzteile SAUER SUNDSTRAND COMPANY SAUER SUNDS
6. Increase the pilot signal differential to the required control start pressure An increase in minimum angle servo pressure will be noted as the motor displace ment starts to decrease The differential control start pressure should be the same no matter which pilot pressure is higher Differ ences in control operation when the pilot pressure differential is reversed indicate a problem with the shuttle spool in the control block Toadjustthe control start differential pressure loosen the lock nut using a 10 mm hex wrench and turn the adjusting screw with a 4 mm internal hex wrench Turning the screw clockwise increases the control start pressure Torque the lock nut to 9 Nm 6 6 165 after adjusting Shutdown the prime mover Remove the gauges and install the gauge port plugs Return the pump and motor controls to their normal operation Servo pressure supply oil is usually provided inter nally from the main system ports of the motor If external servo pressure supply is utilized a minimum of 25 bar 360 psi is required to change the motor displacement with the motor shaft turning and a minimum of 70 bar 1015 psi is required with the motor shaft locked SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Component Adjustment Continued Two Line Hydraulic Proportional Control for Dual Path Vehicles Type HC The differential control start pressure for this control may be adjusted wi
7. The plugs on the control housing may be removed with a 7 16 or 11 16 hex wrench When reinstalling torque the 5 16 plugs to 9 Nm 7 ft lbsf and the 9 16 plugs to 37 Nm 27 ftelbsf The valve housing is equipped with filter screens in the passages between the housing and the end cap Units with internal servo pressure supply have a filter screen installed in the end cap passage leading to the valve spool sleeve These screens shouldbe pressed into position with the rounded edge of the filter screens facing out until they are flush to 2 0 mm 0 08 in below the machined surface of the valve housing or end cap Units with external servo pressure supply have a plug installed in the end cap passage leading to the valve spool sleeve This plug may be removed with a 2 5 mm internal hex wrench When installing this plug torque to 2 Nm 18 inelbsf Install anew O ring onto the valve spool sleeve in the end cap Install new O rings onto the end cap Install the valve housing onto the multi function block and install the screws Torque the screws to 78 Nm 58 ftelbsf for 060 080 or 110 units or to 110 Nm 81 ftslbsf for 160 or 250 units Fig 50 43 Remove HZ Control Housing Fig 50 42 Remove HZ Control Housing Screws 44 LL Fig 50 44 HZ Control Components 51000016 Er Eu L Fig 50 45 HZ Fig 50 46 End Cap Control Housing O Rings Installed Screens 00008
8. Pressure Control Pilot PCP Valve for Electrohydraulic Proportional Control Types EP and EQ r r Thoroughly clean external surfaces of control n Using a 4 mm internal hex wrench remove the four w DE A 4 screws and remove the PCP valve Check surfaces for damage Clean internal 51000133 Fig 50 107 Remove Fig 50 108 PCP screens PCP Valve Screws Valve Components Install new O rings on the PCP housing and retain with petroleum jelly Position the PCP on the control valve housing and install the screws Torque the screws to 5 4 Nm 48 inelbsf Fig 50 109 Install Fig 50 110 Torque PCP onto Control PCP Valve Screws 50 20 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Multi function Block Removal and Installation Remove the external control assembly as described in the instructions for the specific control Remove the four 4 screws and washers for 060 080 and 110 units retaining the multi function block tothe end cap with an 8 mm internal hex wrench 060 080 and 110 units or a 10 mm internal hex wrench 160 and 250 units Remove the multi function block from the end cap Remove the O rings between the multi function block and the end cap and the O ring on the valve spool sleeve The multi function block is equipped with filter screens in the passages bet
9. Q60 40 3 SAUER SUNDSTRAND 6 1 en Axial Piston Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued Controls M1E1 E2 E5 1 1 2 1 1 2 M1K1 K2 E1 E2 E5 F1 F2 H1 H2 K1 K2 40 4 SAUER SUNDSTRAND S Bent Axis Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued Controls Continued Oe Applies to the indicated n frame size s 50 NE S11T 060 080 110 S11T 10 160 250 060 080 510 10 E 160 250 cud 110 M50A 6 M50 9 50 M48A Mit M34 ji 060 080 110 M26 S Jio 34 M10 40 5 sauer SUNDSTRAND 6 1 e Bent Axis Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued PC Regulator Z10 amp Z20 usan 45 e a Q60 40 6 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 S Exploded View of the Series 51 Variable Motor Continued Item B000 B80 L35 L40 L50 L70 C000 L40 L50 L75 L80 Fiss F10 F20 G00A GOOB GOOR G00S G12 G14 G16 G18 G20 G20N G24 G26 G30 G36 G38 G42 G44 G50 G70 G90 K10 K14 K16 K16 K18 K18N K50 K70 K80 K90 K90N Description Quantity COMMON PARTS GROUP SAE FLNG O RING FLANGE SAE SEAL SHAF
10. SAUER SUNDSTRAND Series 51 Variable Motors Service Manual SAUER SUNDSTRAND Bent Axis Variable Displacement Motors General Description Series 51 Variable Displacement Motors are bent axis design units incorporating spherical pistons These motors are designed primarily to be combined with other products in closed circuit systems to trans fer and control hydraulic power Series 51 Motors have a large maximum minimum displacement ratio 5 to 1 and high output speed capabilities SAE flange and cartridge motor configu rations are available A complete family of controls and regulators is avai lable to fulfill the requirements of a wide range of applications S Series 51 Motors equipped with controls normally start at maxi mum displacement This provides maximum starting torque high acceleration The controls may utilize externally or internally sup plied servo pressure They may be overridden by a pressure compensator which functions when the motor is operating in motor and pump modes A defeat option is available to disable the pressure compensator override when the motor is running in pump mode The pressure compensator option features a low pressure rise short ramp to provide optimal power utilization throughout the entire displacement range of the motor The pressure compensator is also available as a stand alone regulator The Series 51 Advanced Technology Today T
11. 50 21 SAUER G SUNDSTRAND Lr Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Servo Pressure Supply Shuttle Spool Remove the servo pressure supply shuttle spool plug from the multi function valve with a 9 16 hex wrench NOTE If a pressure compensator valve block is installed the opposite end of the shuttle spool bore in the multi function valve is 4 i plugged with an internal hex head plug lo i cated under the valve block If a pressure 000139 0 120 Remove compensator valve block is not installed the Servo Pressure Servo Pressure opposite end of the shuttle spool bore is Supply Spool Plug Supply Shuttle Spool phage a hex head plug Remove the servo pressure supply shuttle spool from the multi function valve block Inspect the shuttle spool for burrs or scoring The spool must slide free in its bore The shuttle ballin the spool must be free to move 51000030 Fig 50 121 Multi function Block with Servo Pressure Supply Shuttle Spool Install the shuttle spool into the multi function block Install the hex head plug into the multi function valve and torque to 37 Nm 27 ftelbsf NOTE If an internal hex head plug was removed from the opposite end of the shuttle spool bore torque it to 20 Nm 15 ftelbsf Fig 50 122 Install Fig 50 123 Torque Servo Pressure Servo Pressure Supply Shuttle Spool Supply Spool Plug
12. Functional Description Continued _ Fig 10 14 Series 51 Motor with S1 Control 91000163 Fig 10 15 S1 Control Components L2 M6 M4 M3 x A M1 1 A4 disp 504 opt T3 f T2 1 B1 E TW 05 7 plug for T8 M9 i xt x pes T X3 M5 Servo press external M2 Servo B Pressure internal 51000085 Fig 10 16 S1 Control Schematic Series 51 Electric 2 Position Control Type S1 A 12 VDC solenoid valve mounted on the multi function block directly operates the control valve spool in the end cap The control valve in the end cap is biased by a threshold spring and controls oil flow to the ends of the servo piston Servo pressure may be supplied from an external source or internally by the shuttle spool in the multi function block PCOR is available with this control With the S1 control energizing the solenoid causes the motor to shift to maximum displacement When the solenoid is not energized the motor is held at minimum displacement SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Hydraulic Proportional Control Type HZ The HZ control consists of a cover plate mounted directly on the end cap A ball type shuttle valve provides internal servo pressure supply to the control valve in the end cap PCOR
13. XB Pressure Tee into Defeat Pressure Line s SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Start Up Procedure and Maintenance Start Up Precautions Cleanliness Ensure that all system components including fittings pipes and hoses are completely clean If cloths are used for cleaning components they must be made of lint free materials Follow the guidelines presented in Sauer Sundstrand publication BLN 9887 or 697581 for required fluid cleanliness levels at machine start up Reservoir and Fluid Level The reservoir should be designed to accommodate maximum volume changes during all system operat ing modes and to promote de aeration of the fluid as itpasses through the tank The reservoir outlet charge pump inlet and the reservoir inlet fluid return must always be below the normal fluid level A sight glass is the preferred method for checking fluid level The reservoir inlet fluid return should be positioned so that flow to the reservoir is directed into the interior of the reservoir for maximum dwell and efficient de aeration A baffle or baffles between the reservoir inlet and outlet ports will promote de aeration and reduce surging of the fluid No funnel shaped eddying at the reservoir outlet charge pump inlet or formation of foam at the reservoir inlet fluid return is permitted Start Up Procedure The following start up procedure should always be followed when starting up a new Ser
14. the pilot piston and spring from the valve housing Remove the pilot piston pin from the multi function block Install new O rings on the valve housing and retain with petroleum jelly The plugs on the control housing may be removed with a 1 4 internal hex wrench When reinstalling torque the 9 16 plugs to 20 Nm 15 ftelbsf oe sauer SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Install the pilot piston pin in the multi function block Position the valve housing with O rings on the multi function block c UUU Fig 50 101 Pilot Fig 50 102 Install Piston Pin Installed Control Housing Install the pilot piston into the housing and over the pin The end of the piston with the cross drilled hole should engage the pin Install the small spring in the outer end of the pilot piston Fig 50 103 Install Fig 50 104 Install Pilot Piston Spring Install the control cover and gasket Align the control assembly with the multi function block and install the four 4 screws Torque the control screws to 6 4 Nm 4 7 ftelbsf Reinstall the PCP valve if removed i 000130 Fig 50 105 Torque Fig 50 106 Install Cover Gasket and PCP Valve Screws 50 19 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued
15. 00008 Fig 50 47 Install HZ Fig 50 48 Torque Control Housing HZ Control Valve Housing Screws 50 59 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Hydraulic Proportional Control Type HS Thoroughly clean external surfaces prior to removal of control Remove the screws retaining the valve housing to the multi function block with a 4 mm internal hex wrench Remove the valve housing Fig 50 49 Remove HS Control Housing Screws The plug on the control housing may be removed with an 11 16 hex wrench When reinstalling torque the plug to 37 Nm 27 ftelbsf Install a new O ring onto the valve housing 91000019 Fig 50 50 HS Control Components Install the valve housing onto the multi function block and install the screws Torque the screws to 6 4 Nm 4 7 ftelbsf Fig 50 51 Torque HS Control Housing Screws 50 10 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Hydraulic Proportional Control with Maximum Angle Over ride Types H1 H2 or K1 K2 Thoroughly clean external surfaces prior to removing the control The solenoid may be removed from the valve by removing the nut with a 3 4 hex wrench The solenoid valve may be removed from the control valve housing with a 7 8 hex wrench Remove
16. 1 These controls do not require adjustment CAUTION Do not tamper with the adjusting screw in the end cap opposite the control Pilot pressure for the E1 E2 or F1 F2 electric sole noid valve is internally supplied When the solenoid is energized motor charge pressure should be present at test ports M7 and M8 When the solenoid is not energized test port M8 should drop to case pressure The S1 control utilizes a direct acting solenoid to operate the control valve spool in the end cap Servo pressure supply oil is usually provided inter nally from the main system ports of the motor If external servo pressure supply is utilized a minimum of 25 bar 360 psi is required to change the motor displacement with the motor shaft turning and a minimum of 70 bar 1015 psi is required with the motor shaft locked SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Hydraulic Proportional Control Types HZ HS H1 H2 and K1 K2 The control start pressure for these controls may be adjusted with the adjusting screw on the end cap opposite the control block Control start is that pilot pressure at which the motor displacement starts to decrease To check the control start setting install a gauge to monitor the pilot pressure connect to port M7 or tee into the pilot line connected to port X1 and the minimum angle servo pressure port M3 If adjusting an H1 or H2 control the o
17. 10 mm internal hex wrench 250 units Remove the cover Remove the O rings between the cover and end cap Install new O rings on the end cap and retain with petroleum jelly Install the cover onto the end cap and install the screws Torque the screws to 78 Nm 58 ftelbsf for 060 080 or 110 units or 110 Nm 81 ftelbsf for 160 or 250 units The plug in the cover may be removed with a 7 16 hex wrench Torque this plug to 9 Nm 7 ftelbsf Fig 50 19 Remove Fig 50 20 Remove Charge Relief Valve Charge Relief Valve Plug 51000069 Fig 50 21 Charge Relief Valve Components 79 Fig 50 22 Remove Fig 50 23 Install Servo Cover Screws Servo Cover 50 5 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors 6 Series 51 Minor Repair and Replacement Variable Motor Continued I 000 00007 Fig 50 24 Remove Fig 50 25 Remove Cover Plate Screws Cover Plate 51000168 Fig 50 26 Remove Valve Sleeve Bore Plug 51000010 Fig 50 27 N2 Control Components Fig 50 29 Torque Plug in End Cap Fig 50 28 Torque Cover Plate Screws 50 56 Hydraulic 2 Position Control Type N2 Thoroughly clean external surfaces prior to removal of cover plate Remove the four 4 screws retaining the cover plate tothe end cap with an 8 mm internal hex wrench 060 080 and 110 units or a 10 mm internal hex wrench 160 and 250 units Remove the cover plate Rem
18. 50 1 Shaft Seal SAE Flange Configuration is 50 2 Shaft Seal Cartridge Configuration sir 50 3 Loop Flushing Shuttle Valve iii 50 4 Charge Pressure Relief Valve nennen enne nsn rennen innen nenas 50 5 Minimum Angle Servo Cover ii enne 50 5 Hydraulic 2 Position Control Type iii 50 6 Electrohydraulic 2 Position Controls Types E1 E2 and F1 F2 50 7 Electric 2 Position Controls Type 1 iii 50 8 Hydraulic Proportional Control Type HZ sentent nennen 50 9 Hydraulic Proportional Control Type HS issus 50 10 Hydraulic Proportional Control with Maximum Angle Over ride Types H1 H2 or K1 K2 50 11 Two Connection Hydraulic Proportional Control Type HP 50 12 Two Connection Hydraulic Proportional Control for Dual Path Vehicles Type HC 50 14 Electrohydraulic Proportional Control Types EP and EQ ss 50 18 Pressure Control Pilot PCP Valve for Electrohydraulic Proportional Control Types EP and EQ 50 20 Multi function Block 50 21 Pressure Compensator Regulator Type iii 50 26 Control OriflgeS u his 50 27 Plug Fitting ere EE 50 27 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Introduction The purpose of this manual is to provide information necessary for t
19. 51000019 Fig 10 21 HS Control Components L2 M6 M4 M3 x i A M1 ER A1 m 4 max disp HL hh x EIE le 73 x 2 a O l B1 A k 4 T7 US plug for M9 ext servo press Tim X3 M5 b Servo press external M2 Servo B Pressure internal E L1 7 xi m HS s ci NM Fee due X la M7 X1 K1 K2 M X1 51000022 Fig 10 22 HS H1 H2 and K1 K2 Control Schematic Series 51 Hydraulic Proportional Control Type HS The HS control consists of a cover plate with a hydraulic port mounted on the multi function block Servo pressure may be supplied from an external source or internally by the shuttle spool in the multi function block PCOR is available with this control The function of the HS control is identical to the function of the HZ control SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Hydraulic Proportional Control with Electric Override Types H1 H2 and K1 K2 The function of the H1 H2 and K1 K2 controls is similar to the function of the HS control A 12 or 24 VDC solenoid valve is installed between the external pilot pressure source and the control spool With the H1 H2 controls energizing the solenoid allows the control to function as an HS control When the solenoid is not energized pilot pressure
20. Retaining Seal Carrier Ring Cartridge Cartridge 59 nu U Uu 00006 Fig 50 11 Seal Installed in Carrier Cartridge 510000 Fig 50 10 Seal Carrier Removed Cartridge 50 3 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued 51000057 Fig 50 13 Install Carrier Retaining Ring Cartridge Fig 50 12 Install Seal Carrier Cartridge 000 00006 Fig 50 14 Remove Fig 50 15 Remove Shuttle Valve Plugs Valve Spool Fig 50 16 Loop Flushing Shuttle Valve Components 64 000065 Fig 50 18 Install Plugs and Springs Fig 50 17 Install Valve Spool and Washers 50 4 Install the carrier O ring into the groove in the hous ing Priorto assembly lubricate the carrier O ring and the 1 0 of the seal with petroleum jelly Protectthe seallip from damage during installation by wrapping the spline or key end of shaft with plastic film or by using a seal installation tool Assemble the carrier and seal over the shaft and into the housing bore Take careto not damage the O ring or seal lip during installation Install the seal carrier retaining ring Loop Flushing Shuttle Valve Option Using an 11 16 wrench remove the hex plugs from both sides of end cap Remove springs and spring seat washers Note the orientation of the washers NOTE The250frame size motors usethicker s
21. connects the end of the control valve spool in the end cap with pilot pressure provided by the shuttle spool in the multi function block or with the motor case The control valve in the end cap is biased by a threshold spring and controls oil flow to the ends of the servo piston Servo pressure may be supplied from an external source or internally by the shuttle spool in the multi function block PCOR is available with these controls With the E1 and E2 controls energizing the solenoid will cause the motor to shift to minimum displace ment When the solenoid is not energized the motor is held at maximum displacement With the F1 and F2 controls energizing the solenoid causes the motor to shift to maximum displacement When the solenoid is not energized the motor is held at minimum displacement oe Series 51 2 i 0000 Fig 10 11 Series 51 Motor with E1 E2 F1 F2 Control 51000013 Fig 10 12 E1 E2 and F1 F2 Control Components L2 M6 M4 M3 x x disp a U4 opt 1 E 1 2 B1 ana 05 plug fi ELE mig cad ue press DX X3 M5 Servo press external M2 Servo B Pressure i internal T M M8 M7 51000014 Fig 10 13 E1 E2 and F1 F2 Control Schematic SAUER SUNDSTRAND Bent Axis Variable Displacement Motors
22. for 060 080 and 110 units retaining the control housing to the end cap with an 8 mm internal hex wrench 060 080 and 110 units or a 10 mm internal hex wrench 160 and 250 units Remove the control housing from the end cap Re move the O rings between the control housing and the end cap and the O ring on the valve spool sleeve Fig 50 77 Remove Fig 50 78 Remove HC Control Housing HC Control Housing Cover Screws Cover 1 LI YN m a Tn 51000107 Fig 50 79 Remove Fig 50 80 Remove Adjustment Spring Pilot Piston Pin and and Pilot Piston Control Start Spring rg 000109 Fig 50 81 Remove Fig 50 82 Remove Control Housing Control Housing Screws 50 15 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Fig 50 83 HC Control Components Fig 50 84 HC Control Housing Screens 51000112 51000110 510001 Fig 50 86 Install Fig 50 87 Torque 51000111 Fig 50 85 End Cap O Rings Installed for HC Control HC Control Housing HC Control Housing 50 16 Screws The plugs on the control housing may be removed with a 7 16 hex wrench or a 1 4 internal hex wrench When reinstalling torque the 5 16 plugs to 9 Nm 7 ftelosf and the 9 16 plugs to 20 Nm 15 ftelbsf The control housing is equipped with filter screens in the passages between the hou
23. in the multi function block routes system high pres sure to the PCOR spool valve For single direction PCOR operation the PCOR spool valve is connected to one 1 side of the closed loop through passages in the multi function block When system pressure exceeds the PCOR setting the spool valve moves to connect the displacement reducing end of the servo piston to the motor case and the displacement increasing end of the servo piston to system pressure This increases the motor displacement which reduces the motor output speed When the PCOR valve closes control of the servo piston returns to the control spool in the motor end cap CONTENTS O Series 51 91000029 Fig 10 35 Multi function Block Without Control 91000030 Fig 10 36 Multi function Block with Servo Pressure Supply Shuttle Spool d Fig 10 37 Multi function Block with PCOR Block and Spool Valve K1 K2 Control Shown 10 13 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued T DT Fig 10 38 Multi function Block Defeat Spool Components 5 10U0UU32 with PCOR Shuttle Valve Shuttle Valve NES A1 A1 Defeat T H i T5 a ji B1 i M L f B1 PCOR PCOR Valve Valve Standard with Defeat Pressure Compensat
24. is not available with the HZ control Feedback springs single spring for 060 080 and 110 and a threshold spring are installed in the end cap The feedback springs and threshold spring provide a force on the end of the control spool The force of the threshold spring is externally adjustable with an adjusting screw The feedback spring is positioned between the control spool and a feedback lug attached to the servo piston The force of the feedback spring increases as the motor s displace ment decreases Pilot oil pressure from an external source is applied to the end of the control spool opposite the feedback and threshold springs An increase in pilot pressure above the threshold pressure and within the modu lating pressure range will result in a decrease in motor displacement while a decrease in pilot pres sure will result in an increase in motor displacement Fig 10 17 Series 51 Motor with HZ Control 91000019 21 R Fig 10 18 HZ Control Components 91000016 L2 M6 M4 M3 x x M9 X3 M5 Servo press external M2 US plug for ext servo press Servo i Pressure internal Lil Fig 10 19 HZ Control Schematic 51000017 10 7 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Fig 10 20 Series 51 Motor with HS Control
25. loop flushing Series 51 motors used in open circuit appli 51000003 Fig 10 2 Loop Fig 10 3 Loop cations may have the optional loop flushing defeat Flushing Flushing Defeat components installed Components Components Series 51 motors equipped with an integral loop flushing valve also include a charge pressure relief valve The setting of the motor charge relief valve affects the function of the flushing circuit Higher motor charge relief settings reduce the loop flushing flow and increase the flow over the pump charge pressure relief valve when the circuit is operating Lower motor charge relief settings increase the loop flushing flow and may increase the motor case pres sure when the circuit is operating Anappropriate combination of pump and motor charge pressure settings should be maintained to insure the proper function of the loop flushing circuit Correct charge pressure must be maintained under all condi tions of operation to maintain pump control perfor mance in closed loop systems NOTE An optional orifice may be installed between the motor charge relief and the motor case to limit the maximum flushing oil flow SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Displacement Limiters All Series 51 motors incorporate mechanical dis placement limiters The minimum displacement of the motor can be limited within the standard range by a set screw in the moto
26. output shaft moves out of the housing the synchronizing shaft and rollers could fall out of position re quiring major disassembly of the unit Remove the old seal from the flange Once removed the seal is not reusable Inspect the flange and the new seal for any damage or nicks Using an arbor press press the new seal into the flange Be careful not to damage seal NOTE The outside diameter of the seal may be lightly coated with a sealant such as Loctite High Performance Sealant 59231 prior to Fig 50 4 Remove Fig 50 5 New 51000054 Seal Old Seal from Flange Installed in Flange installation This will aid in preventing leaks SAE SAE caused by damage to the seal bore in the flange Inspect the sealing area on the shaft for rust wear or contamination 50 2 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors CONTENTS Series 51 Minor Repair and Replacement Variable Motor Continued Install a new O ring on the flange Prior to assembly lubricate the flange O ring and the I D of the seal with petroleum jelly Protectthe seal lip from damage during installation by wrapping the spline or key end of shaft with plastic film or by using a seal installation tool Assemble the flange and seal over the shaft and into the housing bore Install four 4 of the flange screws and tighten them evenly to pull the flange into posi tion Take care to not damage the O ring o
27. spool in the end cap Feedback springs single spring for 060 080 and 110 and a threshold spring are installed in the end cap These springs function similar to the HS control Servo pressure may be supplied from an external source or internally by the shuttle spool in the multi function block PCOR is available with this control Two pilot pressures are provided to the control The shuttle spool directs the higher pilot pressure to the end of the pilot piston opposite the feedback spring andthe lower pressureto the opposite side ofthe pilot piston The rod transmits a force proportional to the difference of the pilot pressures to the control spool An increase in the difference between the pilot pres sures will result in a decrease in motor displacement while a decrease will result in an increase in displace ment SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Functional Description Continued Two Line Hydraulic Proportional Control for Dual Path Vehicles Type The HC control operates in a similar manner to the HP control however the HC control is optimized for use in dual path drive vehicles This control consists of a valve block with two 2 hydraulic ports mounted on the end cap The valve block incorporates a shuttle spool and a pilot piston with centering springs A pin transmits force from the pilot piston to the control spool in the end cap A bleed valve is provided
28. to eliminate any air which might become trapped in the pilot piston oil passages Feedback springs are installed in the end cap Servo pressure is supplied internally by a ball type shuttle valve in the control housing PCOR is not available with this control Two pilot pressures are provided to the control The shuttle spool directs the higher pilot pressure to the end of the pilot piston opposite the feedback springs and the lower pressure to the opposite side of the pilot piston The pin transmits a force proportional to the difference of the pilot pressures to the control spool An increase in the difference between the pilot pres sures will result in a decrease in motor displacement while a decrease will result in an increase in displace ment The feedback springs in the end cap have differing spring rates and operate in parallel 060 080 and 110 or series 160 or 250 to provide a linear relationship between motor displacement and pilot pressure differential 51000158 Fig 10 29 Series 51 Motor with HC Control 51000111 Fig 10 30 HC Control Components 12 M6 M4 M3 x1 Fig 10 31 HC Control Schematic 51000160 10 11 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Fig 10 32 Series 51 Motor with EP Control EQ Similar 51000027 Fig 10 33 EQ Control Components EP Similar
29. work func tion WARNING The following procedures may require the ve hicle machine to be disabled wheels raised off the ground work function disconnected etc while performing the adjustment to prevent injury to the technician and bystanders Install gauges to monitor system pressure connect to ports M1 and M2 the minimum angle servo pressure port M3 and the maximum angle servo pressure port M4 Start the prime mover and operate at normal speed Provide a signal to the pump control to provide a constant flow of hydraulic fluid to the motor Provide a signal to the motor control to maintain the motor at its minimum displacement Increase the load on the motor to increase the system pressure to the required regulator start pressure The maximum angle servo pressure M4 will increase and the minimum displacement servo pressure M3 will decrease as the PCOR or PC regulator operates The servo pressures will equalize and the maximum angle servo pressure continue to increase as the motor displacement starts to increase During the transition from minimum to maximum displacement an additional 10 bar 145 psi increase in system pressure may be noted Once the motor is at maximum displacement further increases in load will result in increasing system pressure until the maximum system pressure deter mined by the system relief valve or pump pressure limiter is reached CONTENTS r Fig 30 25 PCO
30. 0 and 160 motors or 110 Nm 81 for 250 motors 6 oe Series 51 51000046 Fig 30 10 Remove Minimum Angle Servo Cover Screws Approximate Change in Maximum Displacement with Change in Spacer Thickness cc mm in 1 in 51000070 Fig 30 11 Torque Maximum Displacement Limiter Screw SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Fig 30 12 Hydraulic 2 Position Control Type N2 Fig 30 13 Electrohydraulic 2 Position Control Types E1 E2 and F1 F2 Type S1 30 8 0000162 Fig 30 14 Electric 2 Position Control Series 51 Displacement Control Adjustments NOTE A change in motor displacement can be de tected by providing a constant flow of fluid to the motor and monitoring the motor output shaft speed while adjusting the control An increase in displacement will result in a de crease in shaft speed while a decrease in displacement will resultin an increase in shaft speed Hydraulic 2 Position Control Type N2 No adjustments are provided for the N2 control A minimum of 25 bar 360 psi servo pressure is required to change the motor displacement with the motor shaft turning A minimum of 70 bar 1015 psi servo pressure is required to change the motor dis placement with the motor shaft locked Electrohydraulic 2 Position Control Types E1 E2 and F1 F2 and Electric 2 Position Control Type
31. 73 Serial Number N 94 25 67890 Serial No Fabr Nr MADE IN GERMANY Place of Manufacture Name Plate German Production 40 1 sauer SUNDSTRAND 6 1 e Axial Piston Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued End Cap Applies to the indicated CH D F HE H G24 G30A D EM 70 amp gt G26 J60 98 so C cs M16 M96 C ad Lo m F K90 ME lt K50 J40 EJ a 4 K10 OR s n i 250 K90 K90A bn 060 160 NN AM G12A G30 ao RAS K18 FA RAS T Mo OR ui S lt K16 G30 060 080 080 160 K16 as G30A G30 aon 250 G30A yg G20A es MUN T3B0 B6 G20 G12 T3C2 i G12A om S20 on v G12A M11 T1A1 A9 AE Sa T1B0 B6 2 9 W T1C2 C7 a Git 0 250 S10 G90 160 250 e Z aoe U 250 30 lt T8A1 A9 p S 8 2 7 P d b G42 o 1 G36 am M11 T2A1 A9 G44 Led T2B0 B aged G38 KOR T2C2 C7 G42 40 2 re Axial Piston Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued Multi Function Block N72 N46 T5 N66 Nd L 5 lt N34 N84 210 amp 720 gt N22 amp d
32. 9810 2 14 M10x65 2 56 36 to 54 2 20 to 3 20 M10x80 3 15 110 22 to 46 1 34 to 2 81 M12x70 2 76 47 to 74 2 87 to 4 52 M12x80 3 15 160 3210 72 1 95 to 4 39 M12x75 2 95 73 to 107 4 45 to 6 53 M12x90 3 54 50 to 90 3 05 to 5 49 M12x75 2 95 91 to 130 5 55 to 7 93 M12x90 3 54 31 to 167 7 99 to 10 19 M12x100 3 94 6 Series 51 Minimum Displacement Limiter Adjustment The minimum displacement is set at the factory and the adjustment screw is covered with a tamper resistant cap WARNING Care should be taken in adjusting displace ment limiters to avoid undesirable speed con ditions The sealing lock nut mustbe retorqued after every adjustment to prevent an unex pected change in operating conditions and to prevent external leakage during unit operation NOTE Changes in motor displacement can be de tected by providing a constant flow of fluid to the motor while maintaining the motor at minimum displacement and monitoring the motor output shaft speed An increase in displacement will result in a decrease in shaft speed while a decrease in displacement will result in an increase in shaft speed To adjust the minimum displacement first remove and discard the cap covering the adjusting screw Using a 17 mm hex wrench for 060 and 080 frame size motors or a 19 mm hex wrench for 110 through 250 frame size motors loosen the lock nut retaining the minimum displacement limite
33. D Bent Axis Variable Displacement Motors Safety Precautions When Series 51 units are used in vehicular Use caution when dealing with hydraulic hydrostatic drive systems the loss of hy drostatic drive line power in any mode of operation may cause a loss of hydrostatic braking capacity A braking system redun dant to the hydrostatic transmission must therefore be provided which is adequate to stop and hold the system should the condi tion develop Certain service procedures may require the vehicle machine to be disabled wheels raised off the ground work function discon nected etc while performing them in order to prevent injury to the technician and by standers fluid under pressure Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing seri ous injury Thisfluid may also be hotenough to burn Serious infection or reactions can develop if proper medical treatment is not administered immediately Some cleaning solvents are flammable To avoid possible fire do not use cleaning solvents in an area where a source of igni tion may be present 20 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Notes 20 2 S Series 51 p eco Bent Axis Variable Displacement Motors Series 51 Gauge Installation Various pressure gauge readings can be a great Snubbers are recommended to protect pressure asset in troubleshooting proble
34. FICE 1 T2 ORIFICE 2 T3 ORIFICE 1 T4 SCREW 2 T5 ORIFICE 1 T6 SCREW 1 7 ORIFICE 2 T8 ORIFICE 1 U3 SCREW FL PT 1 TOA2 CON ORIFICE A2 T1 ORIFICE 1 T2 ORIFICE 2 T3 ORIFICE 1 T4 ORIFICE 2 T5 SCREW 1 T6 ORIFICE 1 7 ORIFICE 2 T8 ORIFICE 1 WNNN SPCLHDW NONE A10 SPEED SENSOR 51V 0 B70 PLUG SOC HD 1 B71 PLUG PLASTIC 1 40 10 Item Y10 Y20 Y30 Z000 Z0 Z10 Z20 Series 51 Description Quantity MINIMUM DISPLACEMENT SCREW SET FLT PT 1 NUT HEX SEAL LOCK 1 TAMPER RESISTANT CAP 1 PRS COMP SET NONE PCOR PRESS COMP SETTING ADJUSTER THREADED 1 PIN STRAIGHT 1 2 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Charge Pressure Relief Valve Loop Flushing ac Valve Shaft gt Jj ey Seal T Control i B Orifices Multi function Block Control Minimum Displacement Limiter 51000052 Variable Displacement Motor SAE Flange Configuration Fig 50 1 Minor Repairs Minor Repairs may be performed following the proce dures in this section without voiding the unit war ranty Although specific products are illustrated these procedures apply to all units in the Series 51 family General Cleanliness is a primary means of insuring satisfac tory transmission life on either new or repaired units Cleaning parts by using a solvent wash and air drying is adequate
35. Fill to Proper Defective Inspect Inlet Filter Adjust Level and Replace if Adjust or Necessary Replace Replace 6 Check System Check Charge and Transmission OK Internal Leakage OK Control Pressures Pump and Motor High Incorrect SYSTEM RESPONSE IS SLUGGISH Check Oil iri Check Pump Inspect Shaft Inspect Shaft rennen or for e Rosena Loose Fitting Low Defective Defective Fill to Proper Purge Air and Inspect Inlet Filter Repair or Align Shafts Level Tighten and Replace if Replace Fittings Necessary EXCESSIVE NOISE AND OR VIBRATION Erg Oil Level OK OkK gt p Check es OK Check eS Inlet in Erg es eS Defective Incorrect Fill to Proper Clean Repair Repair as Inspect Inlet Filter Level or Replace Required and Replace if Necessary Replace Check System Check for Internal Check System Relief Transmission OK System Leakage OK Pressure Settings Low Pump and Motor High High Reduce Load on Repair as Required Adjust or Replace Transmission SYSTEM OPERATING HOT 30 15 SAUER G SUNDSTRAND e Bent Axis Variable Displacement Motors Series 51 Troubleshooting Continued Fault Logic Diagrams Closed Circuit Continued Check Charge Check Pump Interchange System Replace OK control System OK Relief Valves and or OK Transmission n Charge Check Pump and Decays in One Defective 1 Direction Forward Valves Motor irection Forwa r r
36. HEX 2 N66 PLUG STR THD HEX 160 250 1 M86 SCREW FL PT 1 N72 PLUG STR THD SOC HD 1 M90 PLUG STR THD HEX 1 N74 SCREW SET FL PT 3 M91 PLUG EXP 1 N82 O RING 1 M92 PLUG EXP 1 N84 PLUG SPECIAL 2 M96 GASKET 1 N84 PLUG STR THD HEX 2 M98 PLUG 1 N86 SCREW SET 1 24 O RING 5 U5 PLUG SOC EXT SUPPLY 1 U6 ORIFICE PCOR DAMPING 1 M0S1 CONTROL ELECTRIC 2 POS DIRECT U7 ORIFICE PCOR DAMPING 1 F32 BUSHING VALVE ASSY M1S1 SOLENOID 12V M10 ADAPTER PLATE SOLENOID M14 SCREW SOC HD M16 O RING M18 O RING NONN SERVO PRESS SPLY NONE POAA SYS PRESS PROTECT NONE P M20 PIN M O RING N90 PLUG STR THD HEX N91 PLUG EXP 40 9 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors S 1 Exploded View of the Series 51 Variable Motor Continued Item Description Quantity S00D G CONTROL RAMP HP HS H1 H2 K1 K2 10 GUIDE SPRING 160 250 S10D G CONT RAMP SPRING 060 110 S10D G CONT RAMP SPRING ASSY 160 250 S20 GUIDE SPRING S70 SEAT SPRING D SOON CONTROL RAMP NONE SOOT CONTROL RAMP HC 510 GUIDE SPRING S10T CONT RAMP SPRING S11T CONT RAMP SPRING 20 GUIDE SPRING 30 NUT ADJUSTING SCREW 540 O RING S50 NUT LOCK nn 560 SCREW ADJUSTING S70 SEAT SPRING 5000 2 CONTROL RAMP EP EQ S10 GUIDE SPRING 160 250 1 S10U Z CONT RAMP SPRING 060 110 1 S10U Z CONT RAMP SPRING ASSY 160 250 1 TOAO CON ORIFICE A0 NONE TOA1 CON ORIFICE A1 T1 ORI
37. M36 O RING M38 O RING M40 CONTROL SCREEN FILTER M42 PLUG SOC HD M44 PLUG PLASTIC M91 PLUG EXP N90 PLUG STR THD HEX k lt lt Pon pani un M0E1 E2 CONTROL ELHYD 2 POS MOF1 F2 CONTROL ELHYD 2 POS MAX ANG F32 BUSHING VALVE ASSY M1E1 VALVE ASSY SOLENOID 12V M1E2 VALVE ASSY SOLENOID 24V M10 HOUSING CONT ELHYD 2 POS E M10 HOUSING CONT ELHYD 2 POS F M12 PLUG EXP M14 SCREW SOC HD M16 O RING M18 PLUG STR THD HEX M20 O RING M22 PLUG STR THD HEX N90 PLUG STR THD HEX lt aa 40 7 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors S 1 Series 51 Exploded View of the Series 51 Variable Motor Continued Item MOHC F32 1 M10 M11 M12 M14 M16 M18 M20 M22 M24 M25 M26 M28 M32 M34 M38 M40 M44 M46 M47 M48 M50 MOHP F32 M1HP M10 M12 M14 M16 M18 M24 M26 M28 M30 M32 M34 M36 N90 N91 N92 40 8 Description Quantity CONTROL HYD PRPNL 2LN DUAL PATH BUSHING VALVE ASSY HOUSING HYD PRPNL 2LN DUAL SCREW SOC HD WASHER FLAT 060 080 110 COVER GASKET NUT SEAL LOCK SCREW SET FL PT GUIDE SPRING SPRING HELICAL COMPRESSION PISTON DELTA P SEAT SPRING PIN SCREW SOC HD CONTROL SCREEN FILTER PLUG SOC HD VALVE BLEED NUT SEAL LOCK VALVE SHUTTLE DELTA P SEAT BALL CHECK BALL SHUTTLE PLUG STR THD HEX PLUG STR THD HEX CONTROL HYD PRPNL 2LN W BLD BUSHING VALVE ASSY HOUSI
38. NG HYD PRPNL 2LN W BLD COVER GASKET PISTON SHUTTLE DELTA P SPRING HELICAL COMPRESSION PIN O RING VALVE SHUTTLE DELTA P PLUG SEALING O RING PLUG SEALING PLUG EXP SCREW SOC HD PLUG STR THD HEX PLUG EXP PLUG EXP 1 1 4 4 1 1 1 1 1 1 1 1 4 2 4 1 1 1 1 1 1 1 S42 AOA MA mu um un ui Item MOHS F32 1 5 M10 M12 M14 M16 N90 N91 N92 MOHZ F32 M1HZ M10 M12 M14 M16 M18 MOH1 H2 MOK1 K2 F32 M1H1 M1H2 M10 M12 M14 M16 M18 M20 M22 N90 N91 MON2 M1N2 M10 M11 M12 M14 M16 M18 Description Quantity CONTROL HYD PRP 1 LN BUSHING VALVE ASSY HOUSING VALVE HYD PRPRNL 1 LN SCREW SOC HD O RING PLUG STR THD HEX PLUG PLASTIC PLUG STR THD HEX PLUG EXP PLUG EXP Ce CONTROL HYD PRP 1 LN CMPCT BUSHING VALVE ASSY 1 HOUSING VALVE HYD PRP 1 LN CPT 1 VALVE ASSY DBL CHECK SCREW SOC DRILLED CONTROL SCREEN FILTER PLUG STR THD HEX PLUG STR THD HEX Q N N CONTROL HYD PRP 1 LN MAX ANG CONTROL HYD PRP 1 LN MIN ANG BUSHING VALVE ASSY VALVE ASSY SOLENOID 12V VALVE ASSY SOLENOID 12V HSG CONT ELHYD 2 POS PLUG EXP SCREW SOC HD O RING PLUG STR THD HEX O RING PLUG PLASTIC PLUG STR THD SOC HD PLUG EXP 1 1 ND ik 2 POS DIRECT COVER PLUG SCREW SET FLT PT O RING SCREW SOC GASKET PLUG RP rna Bent Axis Va
39. Problem Ch or Reverse Only anges Direction Inspect and Repair Repair or Replace Repair or Replace Loop Flushing Appropriate Valve Valve MOTOR OPERATES NORMALLY IN ONE DIRECTION ONLY Check Inlet Check Outlet Motor at Incorrect Repair or Replace Pressure at OK Pressure at Minimum Displacement Motor Low High Low Incorrect Y Pressure and or Repair LOW MOTOR OUTPUT TORQUE Displacement Control Check Oil Check Pump Level in Output Flow Check Motor Displacement Reservoir Incorrect Improper Incorrect OK Fill to Proper Repair Charge Repair Pump Check and Repair Level System Control and or Control System and Pump Displacement Controls Pump and Motor Repair or Replace IMPROPER MOTOR OUTPUT SPEED ler 30 16 nuda Bent Axis Variable Displacement Motors Series 51 Notes 30 17 SAUER G SUNDSTRAND 6 ez e Bent Axis Variable Displacement Motors Series 51 Notes 30 18 nz S rna Axial Piston Variable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor The following information is for general parts identi fication ONLY Refer to the applicable Service Parts List when ordering service parts Base Unit B80 OPTION WNNS Name Plate SAUER O sAUERSUNDS Ames lowa U S A Neum nster Germany Model Code Typ 51V160 7 E1A2 ANE1 NNN i Model Code 050AA210322 Model Number 516 40104 7866
40. R Block on Multi Function Block K1 K2 Control Shown 51000034 Fig 30 26 Pressure Compensator Regulator Type PC _ 91000048 Fig 30 27 System Pressure Ports Side Port End Cap 30 13 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Fig 30 29 Rotate PCOR PC Adjusting Screw 51000051 Fig 30 30 PCOR PC Adjusting Screw Stop Pin 30 14 Allow the pump to return to its neutral position Repeat the procedure for the other side of the closed circuit if so configured The PCOR or PC regulator must operate at the same start pressure as noted previously Any noticeable difference in operation from side to side may indicate a problem with the pressure supply shuttle spool or brake pressure de feat spool in the multi function block Series 51 NOTE Some motors may be configured for the PCOR or PC regulator to function on only one 1 side of the closed loop Refer to the nomenclature on the motor nameplate In order for the PCOR or PC regulator to function properly on motors equipped with a brake pressure defeat spool the defeat spool must be positioned correctly The control pressure for the defeat spool should be applied to the appropriate port XA or XB as shown in the following table to shift the defeat spool and permit PCOR or PC regulator operation Maximum pressure across the brake pressure defeat po
41. SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 General Description of the Series 51 Variable Displacement Motors The Series 51 variable displacement hydraulic mo tors use spherical pistons and piston rings The angle between the cylinder block and the output shaft can be set between 32 and 6 providing a 5 to 1 maximum to minimum displacement ratio At maximum displacement the motor will provide a certain maximum output shaft torque and minimum speed corresponding to the pressure and flow sup plied to the motor Under the same input conditions but at minimum displacement the shaft speed will be approximately five 5 times faster while the available outputtorque will decrease to approximately one fifth 1 5 the full displacement value The displacement is changed by a servo piston which is connected to the valve segment Minimum Displacement Limiter Hydraulic Pressure Compensator Proportional Override Control Control Pressure Port Go Bs Servo Piston Oylinder Charge Pressure Relief Valve Various hydraulic and electrohydraulic controls may be mounted on the motor end cap to control the servo piston and the motor displacement Servo pressure oil may either be supplied internally from the motor or externally For all controls except the N2 and PC servo pressure oilis suppliedto afour 4 way spool valve inthe motor end cap When a combination of pilot pressure or forc
42. T O RING SCREW SOC HD COMMON PARTS GROUP CARTRIDGE SEAL SHAFT O RING COVER SEAL RING RETAINING MAXIMUM DISPLACEMENT SPACER MAX DISPL LMTR SCREW SOC HD MAX DISPL LMTR END CAP AXIAL 160 250 END CAP AXIAL CODE 61 160 250 END CAP SIDE LOOP FL END CAP SIDE LOOP FL CODE 61 PLUG STR THD HEX PLUG EXP PLUG MANDREL SCREW SET FLAT PT PLUG SPECIAL PLUG STR THD HEX SCREW SOC HD COVER SERVO PISTON PLUG STR THD HEX O RING O RING O RING O RING PLUG ST THD HEX COVER PORT CONTROL SCREEN FILTER ADJ PLUG ASSY CHG RLF SPRING HELICAL COMP GUIDE SPRING 060 160 GUIDE SPRING 250 SHUTTLE VALVE SPOOL LOOP FLUSH SPOOL DEFEAT O RING SPRING HELICAL COMPRESSION POPPET CHG RELIEF NUT HEX LOCK PLUG ST THD HEX D ND ND D D 5 N D ND N Description Quantity JOOA K CONTROL START SETTING J10A K SPRING HEL COMP CONT START 1 J20 SEAT SPRING 1 J30 SEAT SPRING 1 J40 SCREW ADJUSTING 1 J50 O RING 1 J60 NUT ADJUSTING SCREW 1 J70 NUT LOCK 1 JOON CONT START N A FOR 2 POS CONT MOEP CONTROL ELHYD PRP PACKARD CONTROL ELHYD MS F32 BUSHING VALVE ASSY M1EP PCP VALVE PACKARD CONN M1EQ PCP VALVE MS CONN M10 HOUSING CONTROL M12 SCREW SOC HD M14 COVER M16 GASKET M18 SCREW SOC HD M24 PISTON SHUTTLE DELTA P M26 SPRING HEL COMPRESSION M28 PIN M30 O RING M32 PLUG SOC HD M34 PLUG MANDREL
43. TRAND GMBH amp CO SAUER SUNDSTRAND 2800 East 13th Street Postfach 2460 D 24531 Neum nster Ames IA 50010 U S A Krokamp 35 D 24539 Neum nster Germany Phone 515 239 6000 FAX 515 239 6618 Phone 04321 871 0 Fax 04321 871 465 BLN 10043 October 1992
44. adapter plate to the multi function block with a 4 mm internal hex wrench Remove the solenoid and the solenoid adapter plate from the multi function c i block Fig 50 36 Remove Fig 50 37 Remove Remove the solenoid pin from the multi function S1 Control Screws Adapter Plate and block Solenoid Install new O rings onto the adapter plate and the solenoid 91000163 Fig 50 38 S1 Control Components Install the solenoid pin into the hole in the multi function block 51000086 Fig 50 39 Install S1 Control Solenoid Pin Install the adapter plate with O rings onto the multi function block Install the solenoid with O ring onto the adapter plate Install the screws and torque to 6 4 Nm 4 7 ftelbsf 000166 Fig 50 41 Torque Adapter Plate and Control Solenoid Solenoid Screws Fig 50 40 Install 50 58 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors CONTENTS Series 51 Minor Repair and Replacement Variable Motor Continued Hydraulic Proportional Control Type HZ Thoroughly clean external surfaces prior to removal of control Remove the four 4 screws retaining the valve hous ing to the end cap with an 8 mm internal hex wrench 060 080 and 110 units or a 10 mm internal hex wrench 160 and 250 units Remove the valve hous ing Remove the O rings between the valve housing and end cap and the O ring on the valve spool sleeve
45. all the small spring in the outer end of the pilot piston Install the control cover and gasket Align the control assembly with the multi function block and install the four 4 screws Torque the control screws to 6 4 Nm 4 7 ftelbsf Fig 50 64 Install Fig 50 63 Pilot Piston Pin Installed Shuttle Spool and Plugs Fig 50 65 Install Fig 50 66 Install Control Housing Pilot Piston M 51000101 00010 Fig 50 67 Install Fig 50 68 Install Spring Cover Gasket and Screws 50 13 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Fig 50 69 Remove Fig 50 70 Install HC Control Bleed HC Control Bleed Valve Valve 51000104 li Fig 50 72 Remove Servo Pressure Ball Shuttle Valve Fig 50 71 Install HC Control Bleed Valve Seal Nut ur Fig 50 74 Torque Servo Pressure Shuttle Ball Seat Fig 50 73 Install Servo Pressure Shuttle Ball Valve 61 Fig 50 76 Torque Shuttle Spool Plugs Fig 50 75 Install Control Pressure Shuttle Spool 50 14 Two Connection Hydraulic Proportional Control for Dual Path Vehicles Type HC Bleed Valve Loosen the seal lock nut on the bleed valve with a 10 mm hex wrench and remove the valve with a 4 mm internal hex wrench Install the bleed valve and torque to 3 Nm 27 inelbsf
46. ase in current above the threshold current will result in a decrease in motor displacement while a decrease will result in an increase in displacement SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Multi function Block Components The Multi function Valve Block includes a shuttle valve which provides internally supplied servo pres sure and an optional Pressure Compensator Over Ride PCOR function with optional brake pressure defeat Servo Pressure Supply For internal supply the multi function block incorpo rates a shuttle spool with internal check ball valve that routes oil from the main circuit ports of the motor to the control valve in the end cap High side pressure is provided to the servo control valve in the end cap For external supply the connection between the shuttle spool and the servo control valve is blocked in the end cap The external pressure supply to the servo control valve connects to a port M5 on the end cap Pressure Compensator Over Ride PCOR The Pressure Compensator Over Ride PCOR sys tem includes a spool valve located in the PCOR block which is attached to the multi function block This system increases the motor displacement at system pressures above the PCOR valve setting Pressure Compensator Over Ride is not available with the N2 and HZ controls or the PC regulator For bi directional PCOR operation the shuttle valve
47. cking Plate PCOR Screws Less PCOR pw o B zi 000142 i l 1000 Fig 50 126 Remove Fig 50 127 Remove PCOR PC Adjustor PCOR PC Spring and Spool Valve 4 5100014 Fig 50 128 Remove Fig 50 129 Remove PCOR PC Plug PCOR PC Valve Block 51000146 Fig 50 130 Pressure Compensator Valve Block Components 50 23 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Fig 50 131 Install PCOR PC Valve Block w hy Fig 50 132 Install PCOR PC Valve Plug Fig 50 134 Install Adjusting Screw Fig 50 133 Install PCOR PC Spring and Spool Valve 1000149 Fig 50 135 PCOR and PC Regulator Orifices 51000172 Fig 50 136 PCOR and PC Regulator Orifices 50 24 Install the valve block on the multi function block and install the screws Torque the screws to 11 Nm 8 ftelbsf Install the valve block plug and torque to 54 Nm 40 ft Ibsf Install the pressure compensator spool assembly and the valve spring Install the adjusting screw and lock nut Perform the PCOR or PC regulator pressure adjustment as de scribed under Component Adjustment PCOR and PC Regulator Orifices To gain access to the PCOR or PC regulator orifices remove the three 3 plugs located between the defeat spool stop plugs on the multi function block using a 7 16 hex wrench Remove th
48. during start up The external control input signal should be discon nected at the pump control during initial start up This will allow the pump to remain in its neutral position Jog or slowly rotate prime mover until charge pres sure starts to rise Start the prime mover and run at the lowest possible RPM until charge pressure is established Excess air may be bled from the high pressure lines through the high pressure gauge ports Once charge pressure is established increase speed to normal operating RPM Note the charge pressure If charge pressure is incorrect shut down and deter mine cause for improper pressure Shut down prime mover and connect external control input signal Start prime mover checking to be certain pump remains in neutral With prime mover at normal operating speed slowly check for forward and reverse machine operation Charge pressure should be maintained during for ward or reverse operation Continue to cycle slowly between forward and reverse for at least five 5 minutes Shut down prime mover remove gauges and plug ports Check reservoir level and add fluid if neces sary The transmission is now ready for operation 30 3 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors soo Series 51 Start Up Procedure and Maintenance Continued Maintenance Cleanliness The reservoir breather air filter if equipped must be kept clean Clean the area around the filler cap be
49. e from an external control assembly and internal spring force shifts this valve servo pressure is routed to move the servo piston and change the motor s displacement A synchronizing shaft with spherical rollers synchro nizes the rotation of the output shaft and the cylinder block The ball end of each piston runs in a socket bushing pressed into the output shaft There are no other parts used to connect the pistons to the shaft Two tapered roller bearings support the output shaft Valve Segment Bearing Plate Tapered Roller Bearings Synchronizing Piston Shaft P001 196 Fig 10 1 Sectional view of Series 51 variable displacement motor SAE Flange Configuration with Hydraulic Proportional Control 10 1 x coureurs SAUER SUNDSTRAND e Bent Axis Variable Displacement Motors Series 51 Functional Description Loop Flushing Series 51 motors used in closed circuit applications incorporate an integral loop flushing valve as stan dard equipment Installations that require additional fluid to be removed from the main hydraulic circuit because of fluid cooling requirements or circuits requiring the removal of excessive contamination from the high pressure circuit can benefit from
50. e PCOR brake pressure defeat spool if installed Remove the ori fice plug s and plain plug s with a 2 5 mm internal hex wrench Refer to the appropriate Service Parts Manual for information on orifice locations and sizes Install the orifice plug s and plain plug s and torque to 4 Nm 35 inelbsf Install the outer plugs and torque to 6 Nm 4 ftelbsf Reinstall the PCOR defeat spool if removed Additional orifices are installed in the passages under the pressure compensator valve block SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued PCOR Brake Pressure Defeat Spool Remove the PCOR defeat spool bore plugs or fittings with a hex wrench Remove the PCOR defeat spool stop plugs with a 7 16 hex wrench Remove the defeat spool NOTE The defeat spool may be removed from ei ther end of its bore in the multi function block Inspect the defeat spool for burrs or roughness The spool must slide freely in its bore Inspect the pins in the stop plugs for damage Install the PCOR defeat spool into its bore in the multi function block Install the spool stop plugs into the multi function block Torque the stop plugs to 6 Nm 4 ftelbsf Install the defeat spool bore plugs or fittings and torque to 27 Nm 20 ftelbsf Fig 50 137 Remove Fig 50 138 Remove PCOR Defeat Spool PCOR Defeat Spool Plug or Fitting Sto
51. e reservoir 500 hrs It may be necessary to change the fluid more fre quently if the fluid becomes contaminated with for eign matter dirt water grease etc or if the fluid has been operating at temperature levels greater than the maximum recommended Never reuse fluid Thefilter should be changed when changing the fluid or whenever the filter indicator shows that it is neces sary to change the filter sauer SUNDSTRAND cyo Lr Bent Axis Variable Displacement Motors Series 51 Component Inspection and Adjustment WARNING The following procedures may require the ve hicle machine to be disabled wheels raised off the ground work function disconnected etc while performing the adjustments to prevent injury to the technician and bystanders Charge Pressure Relief Valve Adjustment Anappropriate combination ofpump andmotorcharge pressure settings should be maintained to insure the proper function of the loop flushing circuit Correct charge pressure must be maintained under all conditions of operation to maintain pump control performance in closed loop systems To measure motor charge pressure install a 0 to 60 bar or 0 to 500 psi pressure gauge in the motor charge Fig 30 6 Adjusting Charge Pressure pressure gauge port Installa gauge to measure case Relief Valve pressure Operate the system with the prime mover at normal operating speed and the pump at half stroke forward or reverse when m
52. easuring motor charge pressure 91000042 In most applications the motor charge relief valve is set 2 to 4 bar 29 to 58 psi below the setting of the pump charge relief valve measured with the pump in its neutral or zero angle position This setting as sumes a reservoir temperature of 50 C 122 F and is referenced to case pressure 00004 Series 51 motors are equipped with an external screw Fig 30 7 Tighten Charge Pressure Relief adjustable charge pressure relief valve To adjustthe Valve Lock Nut charge pressure loosen the lock nut with a 1 1 16 hex wrench and turn the adjustment plug with a large screwdriver Clockwise rotation of the plug increases the setting and counter clockwise rotation decreases the setting at a rate of approximately 3 4 bar 50 psi per turn The lock nut should be torqued to 52 Nm 38 ftelbsf Once the desired charge pressure setting is achieved remove the gauges and reinstall the port plugs 30 5 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Approximate Change in Minimum Displacement Per Revolution of Adjusting Screw 1 5 cc Rev 09 in3 Rev 2 1 cc Rev 13 in3 Rev 3 1 cc Rev 19 in3 Rev 4 0 cc Rev 24 in3 Rev 6 2 cc Rev 38 in3 Rev Min Displacement Screw Size Range and Length cc Rev in Rev mm in 12 to 29 73 to 1 77 M10x65 2 56 30 to 40 1 83 to 2 44 M10x80 3 15 16 to 35
53. fore opening the reservoir The hydraulic fluid should be filtered before it enters the reservoir Follow the guidelines presented in Sauer Sundstrand publication BLN 9887 or 697581 for required fluid cleanliness levels during machine operation Recommended Fluids Hydraulic fluids used with Sauer Sundstrand prod ucts should be carefully selected with assistance from a reputable supplier following the guidelines presented in Sauer Sundstrand publication BLN 9887 or 697581 Checking for Leaks Check the system components for leakage at regular intervals Tighten any leaking connections while the system is not under pressure Replace any defective seals and gaskets Check hydraulic hoses for damage or aging When installing replacements be certain that the hoses are clean and connected properly Checking the Fluid Level Check the reservoir daily for proper fluid level the presence of water noted by a cloudy or milky appear ance or free water in bottom of reservoir and rancid fluid odor indicating excessive heat 30 4 Changing the Fluid and Filter To insure optimum service life on Series 51 products regular maintenance of the fluid and filter must be performed The fluid and filter must be changed per the vehicle machine manufacturer s recommendations In the absence of such recommendations the following intervals may be used System with a sealed type reservoir 2000 hrs System with a breathing typ
54. he Most Technically Advanced Hydraulic Units in the Industry SAE Flange and Cartridge Motors Cartridge Motors designed for Direct Installation in Compact Planetary Drives Large Displacement Ratio 5 1 Complete Family of Control Systems Proven Reliability and Performance Optimum Product Configurations Compact Lightweight Front page Option hydraulic two position control Copyright 1992 Sauer Sundstrand Company All rights reserved Contents subject to change Printed in U S A 0992H SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Contents Hi GO H 0 2 Basic HYGraulic c de 0 2 General Description of the Series 51 Variable Displacement Motors 10 1 Functional Description sssri erar ttt e tte ten ne 10 2 Technical Specifications and Data Variable Displacement 10 16 Safety PrECAUTIONS 20 1 ECIAM 30 1 Start Up Procedure and Maintenance sienne 30 3 Component Inspection and Adjustment sise 30 5 Troubleshooting 30 15 Exploded View of the Series 51 Variable Motor 40 1 Minor Repair and Replacement Variable Motor 50 1 erc LE
55. he normal servicing of the Series 51 family of variable displacement hydrostatic motors This manual includes unit and component descrip tion troubleshooting adjustments and minor repair procedures By following the procedures in this manual inspections and minor repairs may be per formed without affecting the unit warranty A Series 51 motor does occasionally require servic ing and these units are designed to meetthis require ment Many repairs or adjustments can be completed with out removing the unit from the vehicle or machine provided the unit is accessible and can be thoroughly cleaned before beginning any procedures Basic Hydraulic Circuits CASE DRAIN LINE OUTPUT FLOW BI DIRECTIONAL RESERVOIR Fig 0 1 Basic Closed Circuit 51000001 FLOW FLOW UNI DIRECTIONAL BI DIRECTIONAL OUTPUT 5 TU c a CONTROL VALVE CASE DRAIN LINE 51000002 RESERVOIR Fig 0 2 Basic Open Circuit 0 2 Series 51 Dirt or contamination is the greatest enemy of any type of hydraulic equipment The greatest possible cleanliness is necessary when starting up the sys tem changing filters or performing any other service procedure For Technical Information on Series 51 motors refer to publication BLN 10042 or 368753 For Fluid Quality Requirements refer to publication BLN 9987 or 697581 Sauer Sundstrand provides a complete repair serv ice for its pr
56. ies 51 installa tion or when restarting an installation in which either the pump or motor has been removed from the system WARNING The following procedure may require the ve hicle machine to be disabled wheels raised off the ground work function disconnected etc while performing the procedure in order to prevent injury to the technician and bystand ers Take necessary safety precautions before operating the vehicle machine Prior to installing the motor inspect the unit for damage incurred during shipping and handling Make certain all system components reservoir hoses valves fittings heat exchanger etc are clean prior to filling with fluid soo Series 51 Fill the reservoir with recommended hydraulic fluid which should be passed through a 10 micron nomi nal no bypass filter prior to entering the reservoir The use of contaminated fluid will cause damage to the components which may result in unexpected vehicle machine movement The inlet line leading from the reservoir to the pump must be filled prior to start up Check inlet line for properly tightened fittings and make sure it is free of restrictions and air leaks Be certain to fill the pump and motor housing with clean hydraulic fluid prior to start up Fill the housing by pouring filtered oil into the upper case drain port Install a 0 to 60 bar or 0 to 1000 psi pressure gauge in the charge pressure gauge port to monitor the charge pressure
57. is blocked andthe end ofthe control spool is drained to the motor case causing the motor to shift to maximum displace ment With the K1 K2 controls energizing the solenoid blocks pilot pressure and drains the end of the control spool to the motor case causing the motor to shift to maximum displacement When the solenoid is not energized the control functions as an HS control CONTENTS Series 51 Fig 10 23 Series 51 Motor with H1 H2 Control Fig 10 24 Series 51 Motor with K1 K2 B Control 01000021 Fig 10 25 H1 H2 K1 K2 Control Components SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Functional Description Continued Fig 10 26 Series 51 Motor with HP Control 51000024 Fig 10 27 HP Control Components L2 M6 M4 x x x B1 T3 US plug for M9 7 ext Servo press 9 X3 M5 Servo press XX external M2 Servo Press internal en 71 L1 EE L X2 X1 Fig 10 28 HP Control Schematic 51000025 10 10 Two Line Hydraulic Proportional Control Type HP This control consists of a valve block with two 2 hydraulic ports mounted on the multi function block The valve block incorporates a shuttle spool and a pilot piston with centering springs A pin transmits force from the pilot piston to the control
58. lized a minimum of 25 bar 360 psi is required to change the motor displacement with the motor shaft turning and a minimum of 70 bar 1015 psi is required with the motor shaft locked Series 51 Fig 30 15 Hydraulic Proportional Control Type HZ Fig 30 16 Hydraulic Proportional Control Type HS Fig 30 17 Hydraulic Proportional Control i with Electric Override Type H1 H2 K1 K2 Similar Fig 30 18 Adjusting Control Threshold Types HS HZ H1 H2 and K1 K2 30 9 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Fig 30 19 Two Line Hydraulic Proportional Control Type HP ee ut n Fig 30 20 Adjusting Control Threshold Type HP 30 10 Series 51 Two Line Hydraulic Proportional Control Type HP The differential control start pressure for this control may be adjusted with the adjusting screw on the end cap opposite the control block Control start is that differential pilot pressure at which the motor displace ment starts to decrease To check the control start setting install gauges to monitor the pilot pressures tee into the pilot lines connected to ports X1 and X2 and the minimum angle servo pressure port M3 NOTE Thepilot signals may be determined by prime mover speed other shaft speeds or other control pressures depending upon the de sign of the vehicle machine control circuit
59. ms with the Series 51 gauges Frequent gauge calibration is necessary to motor or support system insure accuracy Fig 30 1 Gauge Ports Motor with N2 Control Port Y2 Servo press external N2 Control Only y Gauge port M3 f lt Servo pressure min displacement Port L1 7 lt Charge pressure 9 16 18 UNF 2B Gauge port M2 Port B system pressure Port Y1 Servo press external N2 Control Only Gauge port M4 Servo pressure max displacement Side Port End Cap Axial Port End Cap Right Side View View in Direction X 51000037 Fig 30 2 Gauge Ports Motor with E1 E2 F1 F2 H1 H2 and K1 K2 Controls o Port X3 Servo press external port 5 i servo press internal Control E1 E2 1 2 Control E1 E2 F1 F2 Control H1 H2 K1 K2 Gauge port M8 Gauge port M7 Control H1 H2 control pressure Control pressure port X1 9 View T e Control K1 K2 Control pressure port X1 XB AI bre 51000038 Port X3 servo press ext Gauge port M5 Gauge port M7 servo press int XA Control pressure Gauge port M7 Control pressure View U View U HS HZ 4 Control pressure Control pressure port X1 port X1 51000039 30 1 SAUER SUNDSTRAND Bent Axis Variable Dis
60. nch Turning the screw clockwise increases the control start current Torque the lock nut to 9 Nm 6 6 ftslbsf after adjust ing PCP supply pressure oil is provided externally PCP supply pressure must be a minimum of 20 bar 290 psi and no more than 70 bar 1015 psi Shutdown the prime mover Remove the gauges and install the gauge port plugs Return the pump and motor controls to their normal operation Servo pressure supply oil is usually provided inter nally from the main system ports of the motor If external servo pressure supply is utilized a minimum of 25 bar 360 psi is required to change the motor displacement with the motor shaft turning and a minimum of 70 bar 1015 psi is required with the motor shaft locked SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Pressure Compensator Over Ride PCOR and Pressure Compensator Regulator Type PC Adjustment The PCOR or PC regulator valve setting may be adjusted with the adjusting screw on the PCOR PC valve block attached to the multi function block The regulator start pressure is that system pressure at which the PCOR or PC regulator starts to increase the motor displacement In order to measure the regulator start pressure setting of the PCOR or the PC regulator the motor output shaft must be loaded to increase the system working pressure This can accomplished by apply ing the vehicle s brakes or by loading the
61. oducts Contact any Sauer Sundstrand Authorized Service Center for details Sauer Sund strand Authorized Service Center locations are listed in publication BLN 2 40527 or 698266 Closed Circuit The main ports of the pump are connected by hydrau lic lines to the main ports of the motor Fluid flows in either direction from the pump to the motor then back tothe pumpin this closed circuit Either ofthe hydrau lic lines can be under high pressure The direction and speed of fluid flow and the motor output shaft rotation depends on the position ofthe pump swash plate The system pressure is determined by the machine load Open Circuit The outlet port ofthe pump is connected by a hydrau lic line to a directional control valve The working ports of this valve are connected to the main ports of the motor When the valve is actuated fluid flows first from the pump to the valve The valve then directs the fluid to the motor in either direction The direction of fluid flow and motor output shaft rotation depends on the direction the control valve is shifted The speed of fluid flow and motor output shaft soeed depends on pump output volume and the distance the control valve is shifted The system pressure is determined by the machine load Fluid returning from the motor is routed through the control valve to the reservoir Additional components may be necessary to provide dynamic braking and to deal with over running loads SAUER
62. or Override 51000033 Fig 10 39 PCOR and PCOR with Defeat Schematic 10 14 An optional brake pressure defeat spool may be installed in the multi function block When used with the PCOR this spool assures that the PCOR does not cause the motor displacement to increase during deceleration which could cause pump overspeed Pressure from a source such as the pump servos or an external valve shifts the defeat spool to block the high pressure supply to the PCOR valve from the deceleration side of the closed loop Either bi directional or single direction PCOR operation can be specified when PCOR defeat is installed Series 51 PCOR Brake Pressure Defeat Operation Rotation High pressure Control pressure port on port oe SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Pressure Compensator Regulator Type PC In this regulator the Pressure Compensator system in the multi function block assembly controls the motor displacement At system pressures below the compensator setting the servo piston is maintained in the minimum motor displacement position When system pressure exceeds the POR setting hydraulic pressure acts on the servo piston to increase the motor displacement With the Pressure Compensator regulator in crease in system pressure above the setting pres sure will result in an increase in motor displacement and output to
63. ove the solid plug from the valve sleeve bore in the end cap An 8 mm threaded hole is provided in the plug for a puller screw Remove the O ring from the plug Remove the O rings from the end cap Install new O rings on the end cap and retain with petroleum jelly Install a new O ring on the solid plug and install the solid plug into the end cap Install the cover plate onto the end cap and install the screws Torque the screws to 78 Nm 58 ftelbsf for 060 080 or 110 units orto 110 Nm 81 ft Ibsf for 160 or 250 units Set screws are installed in control orifice holes in the end cap to plug the valve sleeve bore passages To gain access to the screw plugs remove the outer plugs from the end cap with a 7 16 or 11 16 hex wrench Remove the screw plugs with 3 mminternal hex wrench When installing torque the screw plugs to 4 Nm 35 inelbsf Torque the 5 16 outer plugs to 9 Nm 7 ftelbsf and the 9 16 outer plugs to 37 Nm 27 ft Ibsf Refer to the Control Orifices topic for addi tional information The special plug and seal washer on the end cap opposite the control may be removed with a 13 mm hex wrench When installing torque this plug to 20 Nm 15 ftelbsf SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Electrohydraulic 2 Position Controls Types E1 E2 and F1 F2 Thoroughly clean external surfaces prior
64. p Plug Fig 50 141 Install PCOR Defeat Spool Stop Plug 51800185 Fig 50 140 Install PCOR Defeat Spool 50 25 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued 51000035 Fig 50 142 PC Regulator Components Valve Sleeve Bore Plug 50 26 Fig 50 143 Remove Fig 50 14 4 Servo Drain Orifice T7 Pressure Compensator Regulator Type PC The PC regulator utilizes the multi function block and pressure compensator valve to control the motor displacement Service procedures for these components are in cluded in the Multi function Block section of this manual A valve sleeve bore plug is installed in the motor end cap in place of the valve spool sleeve Remove the plug from the valve sleeve bore in the end cap An 8 mm threaded hole is provided in the plug for a puller screw Remove the O ring from the plug A single servo drain orifice is installed in the valve sleeve bore plug This orifice limits oil flow from the maximum displacement end of the servo piston to the motor case Install a new O ring on the valve sleeve bore plug Install the bore plug into the end cap The special plug and seal washer on the end cap opposite the multi function block may be removed with a 13 mm hex wrench When installing torque this plug to 20 Nm 15 ftelbsf SAUER SUNDSTRAND G r
65. placement Motors S Series 51 Gauge Installation Continued Fig 30 4 Gauge Ports Motor with HP Control Port X3 servo press ext port M5 servo press int servo press int Port X1 External PCP supply pressure X1 X2 Ports X1 X2 Control pressure 9 16 18 UNF 2B 51000040 XA View W T CN XB 9 gt MS Connector MS3102C Packard 7 8 20 UNEF Connector 51000041 Gauge Information System Pressure p Port A 9 16 18 O Ring Fitting System 600 bar or 10 000 psi Gauge Pressure ST Port B 9 16 18 O Ring Fitting Servo 600 bar or 10 000 psi Gauge M3 Pressure Min Angle Servo M4 Pressure T Max Angle 9 16 18 O Ring Fitting Servo 600 bar or 10 000 psi Gauge M5 Supply 9 16 18 O Ring Fitting or M9 Pressure Tee into Control Pressure Line 600 bar or 10 000 psi Gauge 2 9 16 18 O Ring Fitting 600 bar or 10 000 psi Gauge Motor Charge Pressure 60 bar or 1000 psi Gauge 9 16 18 O Ring Fitting M7 Control 60 bar or 1000 psi Gauge M8 Test Port 9 16 18 O Ring Fitting L1 60 bar 1000 psi Gauge 2 Pressure 060 080 110 1 1 16 12 O Ring Fitting 160 250 1 5 16 12 O Ring Fitting X1 Control 60 bar or 1000 psi Gauge X2 Pressure 9 16 18 O Ring Fitting X3 60 bar or 1000 psi Gauge
66. pring seat washers Remove flushing valve spool Inspect parts for damage or foreign material Install flushing valve spool in end cap then install the spring seatwashers thick washers on 250 frame size motors on each end of the spool The step on the spring seat washers should face out toward the springs Install the spool springs and hex plugs Torque the plugs to 41 Nm 30 ftelbsf SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors 6 oe Series 51 Minor Repair and Replacement Variable Motor Continued Charge Pressure Relief Valve Before removing the screw adjustable relief valve plug mark the plug lock nut and end cap to allow maintaining the original adjustment when assem bling Remove the screw adjustable charge relief valve plug by loosening the lock nut with a 1 1 16 hex wrench and unscrewing the plug with a large screwdriver Remove the spring and relief valve poppet Inspect the poppet and mating seat in the end cap for damage or foreign material Install the poppet and spring Install the plug with its lock nut aligning the marks made at disassembly and torque the lock nut to 52 Nm 38 ftelbsf Check and adjust if necessary the charge pressure Minimum Angle Servo Cover Thoroughly clean external surfaces prior to removal of cover Remove the four 4 screws retaining the cover to the end cap with an 8 mm internal hex wrench 060 080 110 and 160 units or a
67. providing clean solvent is used As with any precision equipment the internal mechanism and related items must be kept free of foreign mate rials and chemicals Protect all exposed sealing surfaces and open cavi ties from damage and foreign material It is recommended that all gaskets and O rings be replaced Allgasket sealing surfaces mustbe cleaned prior to installing new gasket Lightly lubricate all O rings with clean petroleum jelly prior to assembly 50 1 saver SUNDSTRAND Lr Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Shaft Seal SAE Flange Configuration Liptype shaft seals are used on the Series 51 motors Replacement of the shaft seal usually requires re moval of the motor from the machine Remove the screws holding the flange tothe housing using a 6 mm internal hex wrench 060 and 080 units an 8 mm internal hex wrench 110 units a 10 mm internal hex wrench 160 units or a 12 mm internal hex wrench 250 units Remove the flange from the housing using a suitable puller Care must be taken so as to not damage the housing bore or shaft 1000178 51000179 Fig 50 2 Remove Fig 50 3 Remove Screws Holding Flange SAE Do not allow the output shaft to move out of the Flange to Housing housing while removing the flange After the SAE flange is removed do not attempt to remove the shaft from the housing If the
68. r Screw 100007 Fig 10 6 Internal Servo Pressure Supply Screen with Multi function Block and or Control Removed Plug for External Supply 000008 Fig 10 7 External Servo Pressure Supply Fitting Plug for Internal Supply 10 3 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued 91000010 Fig 10 9 N2 Control Components M4 Y2 M3 L2 M6 z U4 opt B Li 51000011 Fig 10 10 N2 Control Schematic Series 51 Hydraulic 2 Position Control Type N2 This is a two 2 position maximum minimum displacement control consisting of a cover plate mounted on the end cap An external control valve supplies servo pressure from an external source directly to the servo piston PCOR is not available with the N2 control When servo pressure is supplied to port Y1 the setting piston moves to the maximum motor displace ment position When servo pressure is supplied to port Y2 the setting piston moves to the minimum motor displacement position Orifices may be installed in the external control valve or its connections to regulate the speed of servo piston movement SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Functional Description Continued Electrohydraulic 2 Position Control Types E1 E2 and F1 F2 12 or 24 VDC solenoid valve mounted on the multi function block
69. r adjusting screw Using a 5 mm internal hex wrench for 060 and 080 frame size motors or a 6 mm internal hex wrench for 110 through 250 frame size motors rotate the adjust ing screw to limit the minimum displacement of the motor Rotating the adjusting screw clockwise will increase the minimum displacement of the motor while rotat ing the adjusting screw counter clockwise will de crease the minimum displacement For each full revolution of the adjusting screw the displacement will change according to the accompa nying chart Different minimum displacements may require differ ent length adjusting screws The various lengths are shown in the accompanying chart After establishing the desired minimum displacement setting tighten the lock nut on the adjusting screw to 51 Nm 38 ftelbsf for 060 and 080 frame size motors or 86 Nm 63 ftslbsf for 110 through 250 frame size motors Install a new tamper resistant cap on the adjusting screw oe SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Maximum Displacement Limiter Adjustment The maximum displacement of the Series 51 motors can be limited by limiting the stroke of the setting piston and the resulting movement of the valve segment A displacement stop screw is installed on the setting piston under the minimum angle servo cover to limit the stroke of the piston Spacers may be installed on the displacement stop
70. r housing The maximum displacement can be limited with spacers installed on the servo piston Controls General A wide range of control options is available for the Series 51 motors These include pilot operated Electrohydraulic 2 Position Controls Hydraulic Pro portional Controls single or two 2 connection and Electrohydraulic Proportional Controls A directly op erated Hydraulic 2 Position Control and a Pressure Compensator regulator are also available The Series 51 variable motor servo piston except when equipped with N2 control or the PC regulator may be operated either by servo pressure oil Supplied internally from the main ports ofthe motor or by servo pressure oil supplied from an external source The N2 control uses servo pressure supplied by an exter nal control valve The PC regulator obtains servo pressure from the main ports of the motor Orifice plugs are installed in the control spool sleeve inthe end cap to regulate the flow of oil from the servo piston to the motor housing Orifice plugs may be installed in the end cap to regulate the flow of servo pressure supply oil to the control valve and to regu late the flow of oil from the control valve to the servo piston CONTENTS 2 51 a Fig 10 4 Minimum Displacement Limiter m with Tamper Resistant Cap Cartridge Motor Configuration Shown _ 51000006 Fig 10 5 Maximum Displacement Limite
71. r seal lip during installation Install the flange screws and torque evenly to 32 Nm 24 ft Ibsf for 060 and 080 motors 63 Nm 46 ftelbsf for 110 motors 110 Nm 81 ft Ibsf for 160 motors and 174 Nm 128 ftelbsf for 250 motors Shaft Seal Cartridge Configuration Lip type shaft seals are used on the Series 51 motors These seals can be replaced without major disas sembly of the unit However replacement of the shaft seal requires removal of the motor from the wheel drive or track drive gearbox Remove the seal carrier retaining ring from the hous ing Carefully pull the seal cover out of the housing Care must be taken so as not to damage the housing bore or shaft Remove the O ring from the housing Remove the old seal from the carrier Once removed the seal is not reusable Inspect the carrier and the new seal for any damage or nicks Using an arbor press press the new seal into the carrier Be careful not to damage seal NOTE The outside diameter of the seal may be lightly coated with a sealant such as Loctite High Performance Sealant 59231 prior to installation This will aid in preventing leaks caused by damage to the seal bore in the seal carrier Inspect the sealing area on the shaft for rust wear contamination 51000056 Fig 50 6 Install Fig 50 7 Torque Flange onto Housing Flange Screws SAE SAE bos 51000058 Fig 50 8 Remove Fig 50 9 Remove Carrier
72. rews to 6 4 Nm 4 7 ftelbsf H5 51000116 Fig 50 89 Install Pilot Piston Pin Fig 50 88 Install HC Control Start Spring Fig 50 90 Install Fig 50 91 Install Pilot Piston Pin Seat HC Control Pilot Piston Fig 50 92 Install HC Control Start Adjuster Spring Fig 50 93 Install HC Control Start Adjuster Spring Seat Fig 50 95 Torque Control Cover Screws Fig 50 94 Install HC Control Cover and Gasket 50 17 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors 6 Series 51 Minor Repair and Replacement Variable Motor Continued 1 k um Fig 50 96 Remove Fig 50 97 Remove PCP Valve EP EQ Control Housing Screws 1000086 Fig 50 98 Remove Fig 50 99 Remove EP EQ Control Pilot Piston Pin Housing 51000027 Fig 50 100 EQ Control Components EP Similar 50 18 Electrohydraulic Proportional Control Types EP and EQ Thoroughly clean external surfaces prior to removal of control The Pressure Control Pilot PCP valve may be removed from the control valve housing as de scribed under the following heading Remove the screws retaining the control housing cover and control valve housing to the multi function block with a 4 mm internal hex wrench Remove the housing cover and gasket Remove the valve housing with the pilot piston from the multi function block Remove the O rings from the valve housing Remove
73. riable Displacement Motors Series 51 Exploded View of the Series 51 Variable Motor Continued Description Quantity Description Quantity MOPC REGULATOR PRESS COMP NOA1 6 SVO PRS SPLY PCOR DFT F32 PLUG VALVE BUSHING BORE 1 N1A1 6 HOUSING MULTI FUNCTION BLOCK 1 F33 O RING 1 N11 HOUSING VALVE 1 M1PC HOUSING VALVE 1 N14 NUT HEX LOCK 1 M10 HOUSING MULTI FUNCTION BLOCK 1 N16 O RING 1 M14 NUT HEX LOCK 1 N18 SPRING HELICAL COMPRESSION 1 M16 O RING 1 N20 SEAT SPRING PCOR 1 M18 SPRING HELICAL COMPRESSION 1 N21 BUSHING VALVE 1 M20 SEAT SPRING PC 1 N22 SPOOL PCOR VALVE 1 M21 BUSHING VALVE 1 N23 PLUG STR THD HEX 1 M22 SPOOL PC VALVE 1 N24 O RING 5 M23 PLUG STR THD HEX 1 N26 PLUG SOC HD W PCOR 1 M26 PLUG SOC HD 1 N26 PLUG STR THD HEX WO PCOR 1 M27 PLUG STR THD HEX 10 N27 PLUG STR THD HEX 17 M28 PLUG STR THD HEX 4 N28 PLUG PLASTIC W DFT 2 M29 SCREW SOC 4 N28 PLUG STR THD HEX WO DFT 2 M30 SPOOL BI DIRECTIONAL CHECK 1 N29 SCREW SOC 4 M34 PLUG STR THD HEX 10 N30 SPOOL BI DIRECTIONAL CHECK 1 M36 SCREW SET FLT PT 5 N32 PISTON 1 M38 PLUG EXP 11 N34 PLUG STR THD HEX 10 M50 PLUG EXP 8 N36 SCREW SET FLT PT 5 M52 CONTROL SCREEN FILTER 2 N38 PLUG EXP 060 110 ONLY 11 M54 PLUG EXP 1 N50 PLUG EXP 060 110 ONLY 6 M58 SCREW SOC HD 4 N52 CONTROL SCREEN FILTER 2 M62 PLUG EXP 1 N54 PLUG EXP 1 M66 PLUG STR THD HEX 2 N58 SCREW SOC HD 4 M72 PLUG STR THD SOC HD 1 N62 PLUG EXP 1 M82 O RING 1 N66 PLUG STR THD HEX 060 110 2 M84 PLUG STR THD
74. rque and a decrease in motor shaft speed 51000034 Fig 10 40 Series 51 Motor with PC Regulator 1000035 Fig 10 41 PC Regulator Components L2 M6 M4 M3 X U4 opt ca Om o B L Fig 10 42 PC Regulator Schematic 51000036 10 15 SAUER G SUNDSTRAND soo Bent Axis Variable Displacement Motors Series 51 Technical Specifications and Data Variable Displacement Motors Design Piston motor with variable displacement bent axis construction Type of Mounting SAE four 4 bolt flange SAE Flange Configuration Two 2 bolt flange Cartridge Motor Configuration Pipe Connections Main pressure ports SAE flange Remaining ports SAE O ring thread Direction of Rotation Clockwise and counter clockwise Installation Position Installation position discretionary The housing must always be filled with hydraulic fluid System Pressure Range Input Max 480 bar 6960 psi Min 10 bar 145 psi Case Pressure Max Continuous 3 bar 44 psi Intermittent Cold start 5 bar 73 psi Hydraulic Fluid Refer to Sauer Sundstrand publication BLN 9887 or 697581 Temperature 9 min 40 C 40 F intermittent cold start 9 nominal 104 C 220 F continuous 115 C 240 F intermittent at the hottest point normally the case drain line Hydraulic fluid
75. rts XA and XB is 50 bar 725 psi Pressure Compensator Override Defeat Operation Rotation High system Control pressure port pressure on port Pow 8 x The PCOR or PC regulator valve is screw adjustable To adjust loosen the locknut with a 1 1 16 hex wrench Turn the adjusting screw with a large screw driver until the desired pressure setting is estab lished Clockwise rotation of the adjustment screw willincrease the pressure setting at a rate of approxi mately 70 bar 1000 psi per turn CAUTION A stop pin is installed in the adjusting screw to prevent overtravel of the PCOR PC valve spool The stop pin must protrude distance X 19 mm 75 in from the spring seat for settings of 270 to 370 bar 3900 to 5350 psi or 24 mm 94 in for settings of 110 to 260 bar 1600 to 3750 psi Refer to the appropriate Service Parts Manual for further information While holdingthe adjusting screw fromturning torque the lock nut to 52 Nm 38 ftelbsf Recheck the PCOR or PC regulator setting Shut down the prime mover Remove the gauges and install the gauge port plugs Return the pump and motor controls to their normal operation oe Bent Axis Variable Displacement Motors Series 51 Troubleshooting Fault Logic Diagrams Closed Circuit Check Oil Level OK Check System OK gt Check Pump Check Prime Mover in Reservoir Relief Valve Inlet Pressure Speed Low Pressure Low Low OK Settings
76. screw to limit the stroke A longer or shorter screw must be used to retain a thicker or thinner spacer WARNING Care should be taken in adjusting displace ment limiters to avoid undesirable speed con ditions The stop screw must be retorqued after adjustment to prevent an unexpected change in operating conditions NOTE Changes in motor displacement can be de tected by providing a constant flow of fluid to the motor while maintaining the motor at maximum displacement and monitoring the motor output shaft speed An increase in displacement will result in a decrease in shaft speed while a decrease in displacement will result in an increase in shaft speed To adjust the maximum displacement first remove the screws retaining the minimum angle servo cover tothe end cap with an 8 mm internal hex wrench 060 080 110 and 160 units or a 10 mm internal hex wrench 250 units Remove the minimum angle servo cover and O rings Remove the displacement limiter screw with an 8 mm internal hex wrench Installing a thicker spacer on the end of the setting piston will reduce the maximum displacement of the motor Installing a thinner spacer will increase the maximum displacement The displacement will change according to the accompanying chart Torque the displacement limiter screw to 54 Nm 40 ft Ibsf Install the minimum angle servo cover and its O rings Install the cover screws and torque to 78 Nm 58 ftelosf for 060 080 11
77. sing and the end cap Units with internal servo pressure supply have a filter screeninstalled inthe end cap passage leading to the valve spool sleeve These screens should be pressed into position with the rounded edge of the filter screens facing out until they are flush to 2 0 mm 0 08 in below the machined surface of the valve housing or end cap Install a new O ring onto the valve spool sleeve in the end cap Install new O rings onto the end cap Install the valve housing onto the end cap and install the screws with flat washers on 060 080 and 110 units Torque the screws to 78 Nm 58 ftelbsf for 060 080 and 110 units or to 110 Nm 81 ftelbsf for 160 and 250 units SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Install the control start spring into the control housing Install the pilot piston pin The end of the pin must engage the recess in the end of the control valve spool Install the pilot piston pin seat Install the pilot piston into the housing and over the spring and spring seat The end of the piston with the deeper bore and the cross drilled hole should engage the start spring and pin seat Install the adjustor spring in the outer end of the pilot piston Install the adjustor spring seat Install the control cover and gasket with adjusting screw and seal lock nut Torque the control cover sc
78. stem ports of the motor Fig 30 21 Two Line Hydraulic Proportional Control Type HC 51000158 51000159 Fig 30 22 Adjusting Control Threshold Type HC 30 11 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Component Adjustment Continued Fig 30 23 Electrohydraulic Proportional Control Type EP EQ Similar Se E B o Fig 30 24 Adjusting Control Threshold EP EP 30 12 Series 51 Electrohydraulic Proportional Control Types EP and EQ The control start current for the EP and EQ controls may be adjusted with the adjusting screw on the end cap opposite the control block Control start is that current supplied to the PCP Pressure Control Pilot valve at which the motor displacement starts to de crease To check the threshold setting install instruments to monitor the PCP current and the minimum angle servo pressure port M3 NOTE The current supplied to the PCP may be determined by prime mover speed other shaft speeds control pressures or other elec trical signals depending upon the design of the vehicle machine control circuit Increase the PCP current to the required control start current An increase in minimum angle servo pres sure will be noted as the motor displacement starts to decrease To adjustthe control start current loosen the lock nut using a 10 mm hex wrench and turn the adjusting Screw with a 4 mm internal hex wre
79. th the adjusting screw on the control housing Control start is that differential pilot pressure at which the motor displacement starts to decrease To check the control start setting install gauges to monitor the pilot pressures tee into the pilot lines connected to ports X1 and X2 and the minimum angle servo pressure port M3 NOTE The pilot signals may be determined by prime mover speed other shaft speeds or other control pressures depending upon the de sign of the vehicle machine control circuit Increase the pilot signal differential to the required control start pressure An increase in minimum angle servo pressure will be noted as the motor displace ment starts to decrease The differential control start pressure should be the same no matter which pilot pressure is higher Differ ences in control operation when the pilot pressure differential is reversed indicate a problem with the shuttle spool in the control block To adjust the control start differential pressure loosen the lock nut using a 10 mm hex wrench and turn the adjusting screw with a 4 mm internal hex wrench Turning the screw counter clockwise CCW increases the control start pressure Torque the lock nut to 9 Nm 6 6 ftslosf after adjusting Shut down the prime mover Remove the gauges and install the gauge port plugs Return the pump and motor controls to their normal operation Servo pressure supply oil is provided internally from the main sy
80. the screws retaining the valve housing to the multi function block with a 4 mm internal hex wrench Remove the valve housing The plugs on the control housing may be removed with an 11 16 hex wrench When reinstalling torque the plugs to 37 Nm 27 ftelbsf Install new O rings onto the valve housing Install the valve housing onto the multi function block and install the screws Torque the screws to 6 4 Nm 4 7 ftelbsf When installing the solenoid valve into the valve housing the valve should be torqued to 20 Nm 15 ftelbsf When installing the solenoid onto the valve torque the nut to 15 Nm 11 ftelbsf Fig 50 52 Remove Fig 50 53 Remove H1 H2 or K1 K2 Solenoid Valve Control Solenoid Fig 50 54 Remove Control Housing Screws 51000021 Fig 50 55 H1 H2 and K1 K2 Control Components Fig 50 57 Install Solenoid Fig 50 56 Install Solenoid Valve 50 11 SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Fig 50 59 Remove Control Housing Fig 50 58 Remove HP Control Housing Screws Fig 50 60 Remove Fig 50 61 Remove Shuttle Spool Plug Pilot Piston Pin 51000024 Fig 50 62 HP Control Components 50 12 Two Connection Hydraulic Proportional Control Type HP Thoroughly clean external surfaces prior to removal of control Hold the control ho
81. to removing the control The solenoid may be removed from the valve by removing the nut with a 3 4 hex wrench The solenoid valve may be removed from the control valve housing with a 7 8 hex wrench Remove the screws retaining the valve housing to the multi function block with a 4 mm internal hex wrench Remove the valve housing The plugs on the control housing may be removed with an 11 16 hex wrench When reinstalling torque the plugs to 37 Nm 27 ftelbsf Install new O rings onto the valve housing Install the valve housing onto the multi function block and install the screws Torque the screws to 6 4 Nm 4 7 ftelbsf When installing the solenoid valve into the valve housing the valve should be torqued to 20 Nm 15 ftelbsf When installing the solenoid onto the valve torque the nut to 15 Nm 11 ftelbsf Fig 50 30 Remove Fig 50 31 Remove E1 E2 or F1 F2 Solenoid Valve Control Solenoid 51000013 Fig 50 32 E1 E2 and F1 F2 Control Components A Fig 50 33 Install E1 E2 or F1 F2 Control Valve Housing Fig 50 35 Install Solenoid Fig 50 34 Install Solenoid Valve 50 57 SAUER SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Electric 2 Position Controls Type S1 Thoroughly clean external surfaces prior to removing the control Remove the screws retaining the solenoid and sole noid
82. using in position and remove the screws retaining the cover and control housing to the multi function block with a 4 mm internal hex wrench Remove the housing cover and gasket Remove the valve housing with shuttle valve assembly and pilot piston from the multi function block Remove the O rings fromthe valve housing Remove the pilot piston and spring from the valve housing Remove the pilot piston pin from the multi function block Remove the inner shuttle spool plug from the valve housing A 5 mm threaded hole is provided in the inner plug for a puller screw Remove the shuttle spool from the valve housing Remove the outer shuttle spool plug Remove the O rings from the plugs Install new O rings on the shuttle spool plugs Install new O rings on the valve housing and retain with petroleum jelly SAUER G SUNDSTRAND Bent Axis Variable Displacement Motors Series 51 Minor Repair and Replacement Variable Motor Continued Install the pilot piston pin in the multi function block Install the outer thin shuttle piston plug with the large chamfer toward the shuttle valve bore Install the shuttle spool into its bore and install the inner thick plug with the large chamfer toward the shuttle valve bore Position the valve housing with O ring on the multi function block Install the pilot piston into the housing and over the pin The end of the piston with the cross drilled hole should engage the pin Inst
83. verride solenoid must be energized If adjusting a K1 or K2 control the sole noid must not be energized NOTE The pilot signal may be determined by prime mover speed other shaft speeds or other control pressures depending upon the de sign of the vehicle machine control circuit Increase the pilot signal to the required control start pressure An increase in minimum angle servo pres sure will be noted as the motor displacement starts to decrease To adjust the control start pressure loosen the lock nut using a 10 mm hex wrench and turn the adjusting screw with a 4 mm internal hex wrench Turning the screw clockwise increases the control start pressure Torque the lock nut to 9 Nm 6 6 ftslbsf after adjust ing For the H1 H2 controls the pilot signal pressure supplied to port X1 should also be present at test port M7 when the solenoid is energized When the sole noid is not energized test port M7 should drop to case pressure For the K1 K2 controls the pilot signal pressure supplied to port X1 should also be present at test port M7 when the solenoid is not energized When the solenoid is energized test port M7 should drop to case pressure Shutdown the prime mover Remove the gauges and install the gauge port plugs Return the pump and motor controls to their normal operation Servo pressure supply oil is usually provided inter nally from the main system ports of the motor If external servo pressure supply is uti
84. viscosity must be as shown below Fluid Viscosity Limits vmin 5mm s 42 SUS intermittent vmin 6 4mm s 47 SUS min continuous vmin 13 mm7s 70 SUS optimum 110 510 SUS max continuous v 1600 mm s 7400 SUS intermittent cold start Filtration Acceptable contamination level ISO Code 18 13 or better Refer to Sauer Sundstrand publication BLN 9887 or 697581 Frame Size Dimension 060 080 110 160 250 Displacement maximum 60 0 80 7 109 9 160 9 250 0 in 3 66 4 92 6 71 9 82 15 26 minimum cm 12 0 16 1 22 0 32 2 50 0 in 0 73 0 98 1 34 1 96 3 05 Continuous speed at max disp min rpm 3600 3100 2800 2500 2200 at min disp min rpm 5600 5000 4500 4000 3400 Max speed at max disp min rpm 4400 4000 3600 3200 2700 at min disp min rpm 7000 6250 5600 5000 4250 Theoretical at max disp Nm bar 0 95 1 28 1 75 2 56 3 98 torque Ibf in 1000 psi 583 784 1067 1563 2428 at min disp Nm bar 0 19 0 26 0 35 0 51 0 80 Ibfein 1000 psi 117 156 214 313 486 Max continuous Q max L min 216 250 308 402 550 flow gal min 57 66 81 106 145 Max corner power Pcorner max kW 336 403 492 644 850 hp 450 540 660 864 1140 Mass moment J kg m 0 0046 0 0071 0 0128 0 0234 0 0480 of inertia Ibf ft 0 1092 0 1685 0 3037 0 5553 1 1580 Weight m kg 28 32 44 56 86 with control N2 Ib 62 71 97 123 190 10 16 soo Series 51 SAUER G SUNDSTRAN
85. ween the block and the end cap Units with internal servo pressure supply have a filter screen installed in the end cap passage leading to the valve spool sleeve These screens shouldbe pressed into position with the rounded edge of the filter screens facing out until they are flush to 2 0 mm 0 08 in below the machined surface of the multi function block or end cap Units with external servo pressure supply have a plug installed in the end cap passage leading to the valve spool sleeve This plug may be removed with a 2 5 mm internal hex wrench When installing this plug torque to 2 Nm 18 inelbsf Install new O ring onto the valve spool sleeve in the end cap Install new O rings onto the end cap Install the multi function block onto the end cap and install the screws Torque the screws to 78 Nm 58 ftelbsf for 060 080 or 110 units or to 110 Nm 81 ftslbsf for 160 or 250 units Reinstall the external control assembly as described in the instructions for the specific control i 51000134 Fig 50 111 Remove Fig 50 112 Remove External Control HS Multi function Block Shown Screws k TN Fig 50 113 Remove Fig 50 114 Multi Multi function Block function Block Screens Fig 50 116 Install Multi function Block Fig 50 115 End Cap O Rings Installed Fig 50 117 Torque Fig 50 118 Install Multi function Block External Control HS Screws Shown

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