PVWH Instructional Bulletin, User Manual
Contents
1. Faulty output circuit components pay particular atten tion to relief valves The use of a spike relief valve fast acting is recommended EXCESSIVE NOISE Pump incorrectly being stopped or started under load Low fluid level in reservoir or insufficient supercharge resulting in cavitation Air entering hydraulic system Fluid too cold or viscosity to high Suction line problem i e obstruction in line line too long line diameter too small too many bends and or loops in line Broken or worn piston shoe assembly 15 Pump rotating in wrong direction EXCESSIVE HEATING NR COS Q TO Operating pump above rated or peak pressure Low fluid level in reservoir or insufficient supercharge Air entering hydraulic system Worn piston pump Worn or grooved cylinder barrel 18 and or valve plate 22 matching surfaces Faulty output circuit components continuous blowing relief valve or slip through valves cylinder etc Insufficient cooling provision or clogged coolers SOY Wb xb VI TESTING AND ADJUSTING WARNING Shut pump off and release pressure from the system before disassembling components Failure to comply with these instructions could result in personal injury or death Blocking pressure line before up stream from pump relief valveor system high pressure relief valve will result in dam age and could result in serious personal injury A PISTON PUMP To check for worn piston pump2. gt 20 230 34 45 350 60 390 6 4 NA 3 Bulletin 947015A 1500 psi PVW 2500 ps NA 3 8 NA 150 2 5 150 2 5 N NA fas 8 7 350 5 7 5 NA NA N NA N NA NA NA NA N 3000 psi 3500 psi 4000 psi A NA PIENE NA A NA NA A NA A NA NA NA NA Page 6 DISASSEMBLY A GENERAL Refer to Figures 10 and 11 It will be advantageous to tag simi lar parts particularly screws plugs and o rings during disas sembly to be certain they don t become confused with similar parts and to assure they will be returned to original location Do not remove locator roll pins unless they are deformed or other wise in need of replacement B PREPARATION For disassembly and assembly a crane and or sling capable of handling 200 Ib loads will be useful When disassembling or assembling unit we recommend choos ing an area where no traces of dust sand or other abrasive par ticles which could damage the unit are in the air We also rec ommend not working near welding sand blasting grinding benches and the like Place all parts on a CLEAN surface To clean parts which have been disassembled it is important to use CLEAN solvents All tools and gages should be CLEAN prior to working with these units and new CLEAN lint free rags used to handle and dry parts WARNING NEVER attempt to remove or install any com ponents or assemblies while unit and system is running
3. OPTIONAL THRU SHAFT COVER 8 VALVE PLATE ASSEMBLY WITH KEYWAY SHAFT BRA o sS ROLL PINS TO EXTEND 0 06 0 01 1 5025 FROM SADDLE SURFACE 185 184 82 180 183 ip Fi FRONT oa i 22 SAN PUMP PUMP ASSEMBLY 122 ASSEMBLY X REAR PUMP TO ADAPTER lt MOUNTING BOLTS 189 LOCKWASHERS 190 ARE 3 EA KASS NOT SHOWN WHEN FRONT PUMP IS SIZE 06 OR IO At P STUDS 191 NUTS I92 AND 3 22A oR 22B LOCKWASHER 190 ARE 1 USED INSTEAD OF MOUNT ING BOLTS 188 8 189 181 186 THRU SHAFT VALVE PLATE WITH KEYWAY SHAFT a DUAL PUMP ADAPTER ASSEMBLY Figure 10 Parts Drawing Basic PVWH PVWW PVW Pumps without Controls DS SW 8A 511783 Bulletin 947015A Page 10 X PARTS LISTS Parts used in this assembly are per Oilgear Specifications Use Oilgear parts to ensure compatibility with assembly requirements When ordering replacement parts be sure to include pump type and serial number To assure seal and packing compatibility specify type of hydraulic fluid used ITEM ITEM NO DESCRIPTION NO DESCRIPTION 1 Driveshaft w Keyway side port 16 Ball Fulcrum 1B Driveshaft w SAE Spline side port 17 Spring Shoe Retainer 1D Driveshaft w Keyway rear port 18 Barrel Cylinder 1E Driveshaft w SAE Spline rear port 19 Pin Roll 2 Key Driveshaft 20 Pin Saddle Locating 3 Bearing Front Driveshaft 21 Gasket Valve Plate 4 Ring Shaft Retainer 22
4. measurement of the leakage can be made from the case drain while the pump is under pres sure but pressure control when used is not unloading After the unit is warm either install a flow meter in the drain line or have the flow from the drain line directed into a large container or reservoir The pump case must remain full of fluid during this test CAUTION Do not run a pump on stroke against a blocked output un less it is protected by a high pressure relief valve and then run no longer than necessary to check slip Limit discharge to prevent dropping reservoir fluid below low level With an accurate high pressure gage in the pressure line start pump put it on stroke and stall or block output device to raise system pressure to maximum as set by system relief valve Read the flow meter or time the case drain flow to fill a known size container and calculate the flow rate in terms of cubic inches per minute cipm The leakage should conform with Table 4 or 5 Additional leakage indicates wear but does not become criti cal until it impairs performance B CONTROL Refer to applicable referenced pump control instructions ma terial Table 4 PVWH Pump NOMINAL CASE SLIP vs High Pressure at 1800 rpm viscosities of 160 SSU ps 2500 psi Table 5 PVWW amp PVW Pump NOMINAL CASE SLIP vs High Pressure at 1800 rpm viscosity of 160 SSU Case Slip at Full Stroke and Indicated Pressure PUMP SIZE i
5. to mate with the rectangular groove milled in arc shaped swashblock 11 Place steel backed saddle bearing on pin 9 in other loca tion For size 11 15 20 34 45 and 60 Pumps only both saddle bearings are steel backed It is recommended they be put back in their original locations If replacement saddle bearings are used it makes no difference which is placed in which loca tion For all size PVWW PVW Pumps only both bearings are the same It is recommended they be put back in their origi nallocations If replacement saddle bearings are used it makes no difference which is placed in which location NOTE Install saddle bearings on size 04 thru 20 with notched corners toward shaft and bearing Does not apply to 25 thru 60 size Place the swashblock into the case and be sure the swashblock swivels in the saddle bearings With new bearings swivelling may be stiff not always smooth Position the hydrodynamic bearing 12 into the case so the pin in the bearing will fit per Table 6 a corresponding slot in the housing The bearing should fit into place with little difficulty and be square to the axis of the pump Tap bearing into place if necessary using extreme care not to damage the bearing Insert retaining ring 13 to hold bearing in place Table 6 HYDRODYNAMIC BEARING LOCATION PIN POSITION Left Hand CCW Pumps Pin at 8 00 o clock position between saddle protrusion and pump housing R
6. Bulletin 947116 Pump Control Instructions RU amp RR Solenoid Two Volume Bulletin 947815 Pressure Compensating Controls RS amp Solenoid Two Volume amp CN amp CL Single Pressure Bulletin 947515 Neutral Bulletin 947816 C2 amp C3 Multiple Pressure Bulletin 947518 CU Soft Start Pressure Bulletin 947517 Electronic CH High Low Pressure Bulletin 947514 VU Solenoid Operated Servo Bulletin 947715 HP Horsepower Limiter Bulletin 947513 VV Servo Valve Bulletin 947716 I PREPARATION AND INSTALLATION A MOUNTING ing position is with the driveshaft axis on a horizontal plane and PUMP WITHOUT RESERVOIR The pump may be mounted with case drain Port 1 to the top side Secure the unit to a rigid in any position But for convenience the recommended mount mounting surface See section B on Piping amp Fittings THE OILGEAR COMPANY 2300 So 51st Street Re Issued November 1995 Milwaukee WI 53219 BULLETIN 947015A PUMP WITH RESERVOIR These units are usually fully piped and equipped although it may be necessary to connect to super charge circuit when used Mount reservoir on level foundation with reservoir bottom at least six 6 inches above floor level to facilitate fluid changes B PIPING AND FI
7. relief valves Install bleed valve s at highest point s in system Consult The Oilgear Company for other rec ommendations C POWER Power is required in proportion to volume and pressure used Motor size recommendations for specific applications can be obtained from The Oilgear Company Standard low starting torque motors are suitable for most applications CAUTION Never start or stop unit under load unless system is approved by The Oilgear Company It may be necessary to provide delivery bypass in some circuits D DRIVE See rotation direction plate on units housing Units are avail able for left hand CCW or right hand CW rotation but are not reversible Use direct drive Size and install coupling per manufacturer s instructions CAUTION Do not drive coupling onto pump driveshaft If fit is too tight it may be necessary to heat coupling see manufacturer s instructions Misalignment of pump shaft to driveshaft should not exceed 0 005 0 13 mm Total Indicator Readout TIR in any plane Bulletin 947015A Page 2 E FILTRATION To assure long life from your hydraulic system keep fluid clean at all times See reference bulletins on Filtration Recommen dations and Contamination Evaluation Oilgear recommends the use of a filter in an auxiliary pilot pump circuit Replace filter element s when filter condition indicator reaches change area at normal fluid temperature Drain and thoroughly clean filter
8. taken not to damage cylin der wear surface that matches against the valve plate bearing diameters or piston shoes The use of a sling and or assistance from others and use of proper lifting techniques are strongly recommended to prevent personal injury Page 7 Place the pump in a horizontal position and remove the rotating group by turning shaft 1 slowly while pulling the cylinder bar rel 18 from the housing SHOE RETAINER 14 PISTONS 15 BALL 16 SPRING 17 BARREL 8 Figure 7 Rotating Group Disassembly 511783 See Figure 7 Lift out shoe retainer 14 with piston shoe as semblies 15 and remove fulcrum ball 16 and shoe retainer spring 17 Remove retaining ring 13 and pull hydrodynamic cylinder bear ing 12 from pump housing F DRIVESHAFT GROUP Remove drive key 2 if used and driveshaft bearing retainer ring 29 Grasp outboard end of driveshaft 1 and pull out from pump housing Remove shaft retainer ring 4 and front driveshaft bearing 3 Remove seal retainer 6 and shaft seal 7 from housing only if necessary G SWASHBLOCK GROUP Reach inside the case and remove swashblock 11 Note which saddle bearing is in the upper 10A position and which is in the lower 10B position Remove saddle bearings 10A and 10B from the saddle 8 if necessary If necessary the saddle itself can be pulled out On most units the saddle is located by pin 20 and can be pulled from the housi
9. 0 90 010 90 010 90 012 90 FAM ESI Used on early units Consult factory Page 11 Bulletin 947015A 185 184 I9 192 183 Ip REAR g F FRONT PUMP j S PUMP REAR PUMP TO ADAPTER l F MOUNTING BOLTS 189 AND A LOCKWASHER 190 AFE E USED INSTEAD OF MOUNT hm ING BOLTS amp 1891 22A OR 22B OT sts sien sis PUMP IS SIZE 06 OR ID PEL lt Z STUOS 19 NUTS 192 29 s 190 INTEGRAL VALVE PLATE THRU SHAFT VALVE PLATE BUSHING IS NOT USED REMOVED WITH TYPE TH SPLINE DRIVEN THRU SHAFT VALVE PLATE FOR SPUNED SHAFT AND AUXILARY DRIVE SHAFTS FOR SPLINED SHAFT AND cuo es COVER ASSEMBLY ASSEMBLY Figure 11 Parts drawing Showing Driveshaft w SAE Spline Shaft Side Ports DS SW 8A 511783 IT IS RECOMMENDED THAT SPARE OR REPLACEMENT PARTS BE ORDERED AS PART OF THE FOLLOW ING KITS HOUSING amp PINS SCREWS KEY amp TAG KIT No 72 Kit No 80 ITEM DESCRIPTION ITEM DESCRIPTION 5 Housing Pump 2 Key Driveshaft 7 Seal Shaft 25 Screw Hex Hd 19 Pin Roll 26 N l Identificati 20 Pin Saddle Locating ARD 27 Screw Drive ROTATING GROUP Kit No 73 ROTATING GROUP BEARING 14 Retainer Shoe Kit No 81 15 Assembly Piston Shoe 16 Ball ur ads 12 Bearing Cylinder Hydrodynamic 17 Spring Shoe Retainer 13 Ring Retainer 18 Barrel Cylinder SHAFT amp BEARING SWASHBLOCK Kit No 74 Kit No 82 1 D
10. 2 If replacement is necessary the bushing is not available as a loose item it is included when ordering Valve Plate Assembly Kit No 79L or 79R IX ASSEMBLY Refer to Figures 10 and 11 The procedure for assembling the pump is basically the reverse order of disassembly During as sembly install new gaskets seals and o rings Kit No 77 Ap ply a thin film of CLEAN grease or hydraulic fluid to sealing components to ease assembly If a new rotating group Kit No 773 is used lubricate thoroughly with CLEAN hydraulic fluid Apply fluid generously to all wear surfaces A SWASHBLOCK GROUP If removed press shaft seal 7 into front of pump housing 5 and then place housing on bench with mounting flange side down Place saddle block 8 into housing center properly a locating hole in the saddle and a pin 20 in the housing must match On early units two dowel pins not shown locate the saddle and saddle is secured to housing by two nylock socket head cap screws The saddle bearings 10A and 10B and swashblock 11 can now be installed Check the swashblock faces that mate with the saddle bearings 10A and 10B One of these faces has a rectangular groove cut into it The groove should be on the control upper side of the swashblock for left hand driven pumps and on the lower side for right hand driven pumps For size 04 06 10 and 25 Pumps only the plastic backed saddle bearing should be positioned on pin 9
11. A Valve Plate Side Port rear shaft LH 5 Housing Pump 22B Valve Plate Side Port rear shaft RH 6 Retainer Seal 22C Valve Plate Rear Port LH 7 Seal Shaft 22D Valve Plate Rear Port RH 8 Block Saddle items 8 amp 9 sold as an assembly 23 Seal O ring 9 Pin Roll items 8 amp 9 sold as an assembly 24 Plug SAE Hollow Hex 10A Bearing Upper Saddle 25 Screw Hex Hd 10B Bearing Lower Saddle 26 Nameplate Identification 11 Swashblock 27 Screw Drive 11A Wearplate Swashblock size 60 only 28 Seal O 11 Pin Roll size 60 PVWH only 29 Ring Driveshaft Bearing Retainer 11C Seal O ring size 60 PVWH only 39 Gasket 12 Bearing Cylinder Hydrodynamic 40 Cover 13 Ring Retainer 41 Screw Hex Hd Cap 14 Retainer Shoe 15 Assembly Piston Shoe DUAL PUMP ADAPTER AND COUPLING KITS SIZE 04 06 amp 10 SIZE 11 THRU 60 ITEM ITEM NO DESCRIPTION NO DESCRIPTION 185 Seal O ring 180 Coupling Front 190 Lockwasher 181 Key Coupling 191 Stud 182 Coupling Rear 192 Nut 183 Gasket Adapter 184 Adapter Used when 04 06 or 10 is front pump in dual arrangement 185 Seal O ring instead of bolts 188 and 189 186 Key Coupling 187 Pin Roll 188 Screw Hex Hd Cap 189 Screw Hex Hd Cap not shown 190 Lockwasher not shown 191 Coupling Spline 192 Pin Roll O RING SIZES ARP 568 Uniform Size Number with Durometer ITEM PUMP SIZE 04 06 10 11 15 20 25 34 45 60 PVWH 60 Only 006 70 01
12. AME UNIT THEORETICAL RATED MAXIMUM FLOW RATE MAXIMUM SPEED POWER INPUT SIZE SIZE MAXIMUM CONTINUOUS PRESSURE at 1800 rom rated at 1800 rpm and 14 7 at rated continuous pressure DISPLACEMENT PRESSURE continuous pressure amp psia infet condition and 1800 rprn 147 psia 1 inlet condition in rev ml rev psi bar psi bar gpm l min rpm hp kw A 06 0 86 141 3000 2069 3500 2414 55 20 8 1800 12 9 96 10 1 35 22 1 2000 1379 2500 172 5 9 0 34 1 1800 13 3 99 B 15 2 06 338 3000 2069 3500 2414 127 48 1 1800 30 4 22 7 20 2 83 46 4 2000 1379 2500 172 5 20 3 76 9 1800 27 8 20 7 4 34 4 67 76 5 3000 2069 3500 2414 32 6 123 6 1800 68 4 51 0 45 6 00 983 2000 1379 2500 172 5 42 8 162 2 1800 59 7 445 60 7 94 130 2 1200 82 7 1500 103 4 56 6 2142 1800 47 0 35 1 Higher pressure available consult factory Table 3 NOMINAL DIMENSIONS and WEIGHTS without controls See Page 3 for V Malfunctions and Causes Page 5 04 06 amp 10 4 32 4 50 32 14 5 11 15 amp 20 4 80 6 11 68 30 9 25 34 45 amp 60 6 76 7 18 103 46 8 Note Minimum speed 600 rpm Bulletin 947015A D LOSS OF PRESSURE Worn piston pump Worn or grooved cylinder barrel 18 and or valve plate 22 matching surfaces Worn piston shoe assemblies 15 or piston bores in cylinder Faulty output circuit components Faulty control EXCESSIVE OR HIGH PEAK PRESSURE pas Shed prj Ace
13. Always stop the pump shut off power and release pressure from the system before servicing or testing Be sure provi sions have been made so case drain line can be disconnected from unit without causing the line to drain siphon the res ervoir Disconnect pump from drive motor and piping Usually it is necessary to remove the pump from it s mounting before the case can be drained After removing pump from mounting but before disassembly cap or plug all ports and clean the outside thoroughly to prevent entry of dust into the system Refer to Figure 10 and 11 Depending upon what part or parts are to be inspected it may not be necessary to completely take apart all assemblies C CONTROL GROUP See reference material for applicable information on the control your unit is equipped with Remove four hex head cap screws and lift the control group assembly with control pin straight up from the top of the pump assembly Control pin may or may not remain in the swashblock 11 Remove control gasket and o rings from pump housing D VALVE PLATE GROUP If another unit is coupled to thru shaft units it will be necessary to remove coupling half 180 or 190 before removing valve plate 22 Block unit on bench with driveshaft facing down Remove valve plate 22 by alternately removing four hex head screws 25 and lifting straight up Remove valve plate gasket 21 and o ring 28 E ROTATING GROUP WARNING Extreme care must be
14. Bulletin 947015A SERVICE INSTRUCTIONS OILGEAR TYPE PVWH PVWW AND PVW OPEN LOOP VARIABLE DISPLACEMENT PUMPS PURPOSE OF INSTRUCTIONS These instructions are written to simplify your work when installing operating and maintaining these Oilgear pumps Your acquain tance with the construction principle of operation and characteristics of these units will help you attain satisfactory performance reduce down time and increase the units life Some units have been modified from those described in this bulletin and other changes may be made without notice Figure 1 Typical Oilgear PVWH Open Loop Pump 55503R REFERENCE MATERIAL Specifications PVWW Pumps Bulletin 47013 Volume Pressure Sensing Controls Specifications Pumps Bulletin 47014 CF Single Pressure Load Sense Bulletin 947516 Specifications PVWH Pumps Bulletin 47015 2F Dual Pressure Load Sense Bulletin 947512 Fluid Recommendations Bulletin 90000 HF Horsepower Limit Load Sense Bulletin 947511 Contamination Evaluation Guide Bulletin 90004 Filtration Recommendations Bulletin 90007 Volume Controls Piping Information Bulletin 90011 HN Handwheel Bulletin 947115 MN amp MS Lever
15. TTINGS See reference Piping Information bulletin and individual cir cuit diagram before connecting pump to system For and Pumps using 150 300 SSU VIS COSITY FLUIDS an inlet strainer is not required Inlet should be unrestricted and have a minimum of fittings See reference Specification Bulletin for minimum inlet psia requirements at selected input rpm If suction line is used it should reach within 1 to 2 times its diameter from the bottom of reservoir do not bottom out tubes in reservoir For PVWW Pumps using 27 30 SSU VISCOSITY FLU IDS pumps should have a flooded inlet and an inlet filter should not be used Inlet should not be restricted and have a minimum of fittings Inlet velocity should not exceed 3 fps 0 9 m s Arrange case drain line so case remains full of fluid non si phoning at less than 25 psi 1 7 bar and case pressure must not be 10 psi 0 7 bar greater than inlet pressure Each drain line must be separate unrestricted full sized and connected directly to the reservoir below the lowest fluid level Drain tubing should NOT incorporate a suction break Provisions for opening this line without draining siphoning reservoir should be made WARNING Running pump in Neutral position zero delivery for long periods of time without supercharge or a case bleed thru circuit can damage the pump System and pump must be protected against over loads by sepa rate high pressure
16. ULLETIN 947015A Litho in USA
17. VE PLATE 22A OR B Figure 3 Type PVWH Pumping Mechanism 511783 HI PRINCIPLE OF OPERATION A ONE WAY PUMP DRIVEN COUNTERCLOCKWISE LEFT HAND IS DESCRIBED See Figure 3 Turning the driveshaft rotates the splined cylinder barrel 18 which contains pumping pistons with swivel shoes 15 A shoe retainer 14 backed up by a spring 17 loaded fulcrum ball 16 holds piston shoes against a swashblock 11 Figure 4 POSITION A Plan Top View Swashblock Posi tioned for Full Delivery Port A 511783 SEE FIGURE 4 POSITION A When the control positions the swashblock for full delivery from Port A the swashblock face is at maximum angle to the cylinder face When cylinder is rotated the piston move in and out of their bores as the shoes ride against the angled swashblock As the cylinder rotates the individual piston bores are connected alternately to the lower Port B and upper Port A crescent shaped ports in the valve plate While connected to the lower suction Port B each piston moves outward drawing fluid from Port B into the piston bore until it s outermost stroke is reached At that point the piston bore passes from the lower crescent port to the upper crescent port While rotating across the upper crescent each piston moves across the angled swashblock face Thus each piston is forced inward Each piston displaces fluid thru the upper crescent port Bulletin 947015A Page 4 to Port A until
18. ZE SIZE MAXIMUM CONTINUOUS PRESSURE a 1800 rpm rated psia barabs SPEED T INPUT DISPLACEMENT PRESSURE continuous pressure amp at rated continuous 147 psia 1 batapg pressure and inlet condition 1800 rom 4 in3 rev mi rev psi bar psi bar gom l min 1200 rpm 1500 rpm 1800 rpm rpm hp kw 04 0 66 108 5000 3448 5800 4000 42 159 54 37 5 7 39 6 1 42 3000 163 122 A 06 0 86 141 4000 2759 4500 310 3 59 224 5 5 38 59 41 64 44 3000 17 7 132 10 1 35 22 1 3000 206 9 3500 E 95 36 0 5 5 38 60 41 70 48 3000 202 151 F 11 1 55 254 5000 3448 5800 4000 109 413 70 48 7 3 50 82 57 3000 365 272 B 15 2 06 33 8 3500 241 4 4000 275 9 147 557 70 48 76 52 84 58 3000 355 265 20 2 83 464 2500 172 4 3000 2069 206 78 1 7 2 50 7 9 54 90 62 2400 350 26 1 segues 25 3 88 636 5000 3448 5800 4000 274 1038 7 6 52 8 5 59 9 5 66 2400 951 70 9 C 34 4 67 765 3500 2414 4000 12759 33 7 127 7 80 55 86 59 96 66 2400 804 600 45 6 00 983 2500 172 4 3000 2069 433 164 1 76 52 86 59 98 68 2400 741 553 60 7 94 1302 1500 103 4 2000 137 9 582 2203 80 55 93 64 145 1 00 1800 64 0 47 8 For higher speeds see suction curves Higher speeds available consult factory Note Minimum speed 600 rpm PVWW Pumps with 27 30 SSU VISCOSITY FLUID FR
19. bleed petcocks at highest point in the system Close connections or petcocks tightly when solid stream of fluid ap pears Figure 2 Cut a Way cross section of Typical PVWH Pump from the right side 88050R CONSTRUCTION Refer to Figures 2 10 and 11 A driveshaft 1 runs through the centerline of pump housing 5 saddle block 8 and valve plate 22 Pump cylinder barrel 18 is splined to driveshaft A bear ing 3 supports the outboard end of the driveshaft and a bush ing integral with the valve plate supports the inboard end The pump cylinder barrel is carried in a journal type hydrodynamic cylinder bearing 12 The valve plate 22 has two crescent shaped ports Pumping piston shoe assemblies 15 in the cyl inder barrel are held against a swashblock 11 by a shoe re tainer 14 The shoe retainer is held in position by a fulcrum ball 16 which is forced outward by shoe retainer spring 17 The spring acts against the pump cylinder barrel forcing it against the valve plate while also forcing the piston shoe against the swashblock 11 The semi cylinder shaped swashblock limits the piston stroke and can be swivelled in arc shaped saddle bear ings 10A and 10B which are pinned 9 into the saddle 8 The swashblock is swivelled by a control covered in referenced material For PVWH Pumps only the pressure side saddle bear ing is force lubricated A small hole in the face of the swashblock 11 provides
20. case FOR 150 300 SSU VISCOSITY FLUID use of ten micron filtration Beta 10 of four or better in pressure or return line is recommended FOR 27 30 SSU VISCOSITY FLUID use of ten micron filtration Beta 10 of fifteen or better in pressure or return line is recommended Continuous filtration is required F FLUID COOLING When pump is operating continuously at rated pressure or fre quently at peak load auxiliary cooling of fluid may be neces sary Fluid temperature should not exceed limits specified in referenced bulletin on Fluid Recommendations G AIR BREATHER On most installations an oil bath type air breather is mounted on top of fluid reservoir Itis important for the breather to be of adequate size to allow air flow in and out of reservoir as fluid level changes Keep breather case filled to the fluid level mark About once every six months remove cover wash screens in solvent clean and refill case to fluid level mark and install dry screen See manufactures recommendations H FLUID FILLING AND STARTING RECOM MENDATIONS and PVW Pumps use 150 300 SSU VISCOS ITY FLUIDS meeting or exceeding lubricating specifications of SAE 10W API Engine Service Classifications SC CC or SE or ISOVG32 thru 68 is recommended viscosity range 150 300 SSU at 100 F 37 7 C For fire resistant fluids phos phate ester hydraulic fluids can be used in accordance with manufacturer s recommendations PVWW P
21. gage shaft splines Continue to slide cylinder forward until it encounters the hydrodynamic cylinder bearing 12 Lifting the tailshaft slightly helps cylinder barrel 18 and cylinder bear ing 12 engagement Continue pushing cylinder forward until the piston shoes contact the swashblock At this point the back of the cylinder should be located slightly outside the back of the pump housing D VALVE PLATE GROUP Place pump housing on bench with open end facing up Install new o ring 28 and gasket 21 on housing Make sure the tail end of shaft engages bushing while positioning the valve plate 22 on pins 19 and housing Finger tighten hex head cap screw 25 closest to o ring 28 first and then alternately tighten other cap screws per Table 7 On thru shaft units connected to another pump or device install coupling half Table 7 TORQUES SIZE VALVE PLATE CONTROL UNIT Ft Lbs N m Ft Lbs N m 04 06 10 8 3 11 3 11 15 20 8 3 11 3 25 34 45 60 16 6 22 6 E CONTROL GROUP See reference material for applicable information on the control your unit is equipped with See appropriate control reference for control group mounting See Table 8 for Torques to secure control group to pump housing SEE SECTION I PREPARATION and INSTALLA TION Bulletin 947015A 7 BUSHING IN SIZES H THRU 60 ONLY SIZE 60 ONLY REFERENCE CONTROL PIN HA IC HB 7 3 2 29
22. ic school is conducted in our Mil waukee plant on a regular basis Custom schools specifically addressing your particular hydraulic and electrohydraulic equip ment can be conducted in your plant SPARE PARTS AVAILABILITY Prepare for future needs by stocking Oilgear original factory parts Having the correct parts and necessary skills in plant enables you to minimize down time Oilgear has developed parts kits to cover likely future needs Oilgear field service techni cians also stand ready to assist your maintenance people in trouble shooting and repairing equipment OILGEAR EXCHANGE SERVICE Standard replacement pumps and motors are available to users of Oilgear equipment where comparable units will be returned in exchange When standard replacements must be modified to replace units which are special shipment will depend on avail ability of parts assembly and test time necessary To obtain this service place an order for an exchange unit and provide the serial number and type designation The replace ment unit will be shipped E O B our factory Milwaukee Wis consin User retains the replacement and returns the worn unit prepaid to The Oilgear Company for reconditioning and test When the unit is reconditioned or stocked the user is billed the cost of reconditioning or a flat rate exchange price if one has been applied to that particular type of unit THE OILGEAR COMPANY 2300 So 51st Street Milwaukee WI 53219 B
23. ight Hand CW Pumps Pin at 4 00 o clock position between saddle protrusion and pump housing Page 9 B DRIVESHAFT GROUP Place housing on its side with axis horizontal and then install seal retainer 6 Place front driveshaft bearing 3 onto driveshaft 1 and lock in place with shaft retaining ring 4 Lubricate shaft seal 7 and shaft then insert driveshaft and bearing as sembly into pump housing 5 and lock in place with driveshaft bearing retainer ring 29 C ROTATING GROUP See Figure 7 Place the cylinder barrel 18 wear surface down on a clean cloth Place the shoe retainer spring 17 in the center of the barrel with the fulcrum ball 16 on top of it Insert the pistons shoe assemblies 15 into the shoe retainer 14 As a unit fit the pistons into their bores in the cylinder barrel DO NOT FORCE If aligned properly the pistons will fit smoothly WARNING Assistance from others and proper lifting tech nique is strongly recommended to prevent personal injury while assembling larger sized pump rotating groups into the pump The rotating group can now be carefully installed over the tail of the driveshaft 1 and into the pump housing 5 When installing the rotating group support the weight of the cylinder barrel 18 as cylinder spline is passed over the tailshaft to avoid scratching or damage Push cylinder forward until the cylinder spline reaches the driveshaft spline and rotate the cylinder slightly to en
24. it s innermost stroke is reached At that point the piston bore passes from the upper to the lower crescent again and the operating cycle is repeated Figure 5 POSITION A 2 Plan Top View Swashblock Posi tioned for Partial Delivery from Port A 511783 SEE FIGURE 5 POSITION A 2 A study of the diagram will show that the degree of swashblock angle determines the length of the piston stroke difference between outermost and inner most position thereby determining the amount of delivery from the pump Figure 6 POSITION N Plan Top View Swashblock Posi tioned for Neutral no stroke no delivery 511783 SEE FIGURE 6 POSITION N Neutral position results when the control centers the swashblock The swashblock angle is now zero and swashblock face is now parallel to cylinder face Therefore no inward or outward motion of the pump piston ex ist as piston shoes rotate around the swashblock face The lack of inward and outward motion results in no fluid being displaced from the piston bores to the crescents in the valve plate and con sequently no delivery from pump ports IV SPECIFICATIONS See referenced material pump control material and individual application circuits for exceptions Tables 2 NOMINAL PERFORMANCE DATA PVWH AND PVW PUMPS with 150 300 SSU VISCOSITY FLUID FRAME UNIT THEORETICAL RATED MAXIMUM FLOW RATE MINIMUM INLET PRESSURE MAXIMUM POWER SI
25. laced all piston shoe assemblies must be replaced Replace as part of Piston Shoe Kit No 87 When installing a new rotating group kit make sure pistons are free in their bores D SWASHBLOCK GROUP Inspect the swashblock 11 for wear or scoring In the case of size 60 units inspect the swashblock wearplate 11A If dam age is extensive replace the swashblock and or wearplate as part of Swashblock Kit No 82 PVWH Pumps only check the very small holes in the face of the swashblock This hole provides porting for the hydro static balance fluid of the piston shoe assembly to be chan nelled through the swashblock to the face of the saddle bearing providing pressure lubrication Compare saddle bearing 10A and 10B thickness in worn area to thickness in an unworn area Replace saddle bearings if dif ference is greater than 0 008 in 0 2mm Check mating surface of swashblock for cracks or excessive wear Swashblock move ment in saddle bearings must be smooth Replace as part of Saddle Bearing Kit No 85 E DRIVESHAFT GROUP Check shaft seal 7 for deterioration or cracks Replace if nec essary Examine the sealing area of the shaft 1 for scoring or wear Inspect shaft bearing 3 for roughness galling pitting or binding Check shaft and splines for wear If driveshaft is bent scored or worn excessively or if bearing is bad replace as part of Shaft and Bearing Kit No 74K or 74S Inspect bushing in valve plate 2
26. ng On early units the saddle is located in the case by two dowel pins not shown and the saddle is secured to the case by two nylock socket head cap screws not shown which will have to be removed before the saddle can be withdrawn from the housing INSPECTION Clean all parts thoroughly Inspect all seals and o rings for hard ening cracking or deterioration and replace if necessary Check all locating pins for damage and spring for cracking or signs of fatigue WARNING Always wear safety goggles when using solvents or compressed air Failure to wear safety goggles could re sult in serious personal injury Bulletin 947015A BARREL 18 BALL 16 SPRING 17 Figure 8 Rotating Group Inspection 511783 A CONTROL GROUP See applicable reference material on pump controls Be sure to carefully check control pin for cracks and or signs of fatigue Check fit of control pin in swashblock It should be a slip fit without side play B VALVE PLATE GROUP Inspect the valve plate 22 surface that mates with the cylinder barrel 18 for excessive wear or scoring Remove minor de fects by lightly stoning the surface with a hard stone that is flat to within 0 001 0 03mm Be sure to stone lightly Any exces sive stoning will remove the hardened surface If wear or dam age is extensive replace the valve plate as part of Valve Plate Assembly Kit No 79L or 79R and cylinder barrel 18 C ROTATING GROUP In
27. porting for the hydrostatic balance fluid of the piston shoe assembly 15 through the swashblock to a rectan gular shaped groove milled in one of the two arc shaped swashblock faces to lubricate the face of the mating saddle bear ing PVW and PVWW Pumps are not provided with this feature SEE PAGES 4and 5 III PRINCIPLE OF OPERATION and IV SPECIFICATIONS V MALFUNCTIONS AND CAUSES A UNRESPONSIVE OR SLUGGISH CONTROL 1 reference control instruction material 2 Low control input pilot pressure for R and V volume type controls only 3 Swashblock saddle bearings 10A amp 10B worn or damaged B INSUFFICIENT PUMP VOLUME 1 Delivery limited by faulty control see appropriate control instruction material 2 Obstructed suction circuit or insufficient supercharge vol ume 3 Insufficient drive motor speed Page 3 4 Worn or grooved cylinder barrel 18 and or valve plate 22 matching surfaces Worn piston shoe assemblies 15 or piston bores in cylin der 18 Worn or damaged piston shoe or swashblock 11 IRREGULAR OR UNSTEADY OPERATION C 9 p Faulty control Fluid level in reservoir is low or supercharge is insufficient Air entering hydraulic system Worn axial piston pump Faculty output circuit components cylinder motors valves etc Uu IE Bulletin 947015A CRESCENT PORT CYLINDER BARREL 18 PISTONS W SHOES 15 SHOE RETAINER 14 C C W ROTATION VAL
28. riveshaft 11 Swashblock 2 Key Driveshaft 3 Bearing Front Driveshaft SADDLE 4 Ring Front Driveshaft Kit No 84 6 Retainer Seal 29 Ring Driveshaft Bearing Retainer 8 Block Saddle 9 Pin Roll ASKET EAL KINO 77 i 10A Bearing Upper Saddle 10B Bearing Lower Saddle 7 Seal Shaft 21 Gasket Valve Plate SADDLE BEARING 23 Seal O ring Kit No 85 28 Seal O ring ay NO VALVE PLATE 10A Bearing Upper Saddle Kit No 79 10B Bearing Lower Saddle 21 Gasket Valve Plate 22 Valve Plate 23 Seal O ring 24 Plug Hollow Hex 25 Screw Hex Hd 28 Seal O ring Bulletin 947015A Page 12 Fold out for Parts Drawing and Parts List page 11 and 12 NOTES Page 13 Bulletin 947015A XL AFTER SALES SERVICES Oilgear builds products that last However it is the nature of this type of machinery to require proper maintenance regardless of the care that goes into its manufacture Oilgear has several service programs to help you STAY ON STREAM SERVICE By signing up for Oilgear s Stay On Stream program you can prepare for problems before they happen Certain field tests such as fluid testing slip testing and electronic profile recording comparisons can be performed by our field service people or your own trained personnel These tests can indicate problems before they become down time difficulties SERVICE SCHOOLS Oilgear holds schools to train your maintenance personnel A general hydraulic or electron
29. spect cylinder barrel 18 piston bores and the face that mates with valve plate for wear or scoring Remove minor defects by lightly stoning the surface with a hard stone that is flat to within 0 001 0 03 mm Be sure to stone lightly Any excessive ston ing will remove the hardened surface If defects can not be re moved by this method replace the cylinder barrel as part of Rotating Group Kit No 73 Inspect hydrodynamic cylinder bear ing 12 and matching cylinder barrel surface for galling pit ting roughness damage and replace if necessary Check all piston shoe assemblies 15 to be sure they ride prop erly on the swashblock EQUAL WITHIN 6 001 ozs mm AT THIS 0 003 INCHES 60076 mmj 0 006 INCHES OR 6 152 mm WHEN WORN WHEN NEW ALL SHOE FACES MUST BE FREE OF NICKS Figure 9 Piston and Shoe Inspection 511783 Bulletin 947015A Page 8 PISTON amp SHOE ASSEMBLY I5 SHOE RETAINER 14 See Figure 9 Piston shoes must pivot smoothly but end play should not exceed 0 006 0 152 mm Check end play as fol lows Place square end of piston on bench and hold down firmly Pull on end of shoe with other hand and note end play The shoe must rotate and pivot on the piston ball Inspect each shoe face for nicks and scratches Measure shoe thickness the part held between shoe retainer 14 and swashblock 11 All shoes must be equal within 0 001 0 025 mm If a single piston shoe as sembly needs to be rep
30. umps may use 27 30 SSU VISCOSITY FLU IDS it is suggested you confirm your selection with your Oilgear representative before you specify the type of hydraulic fluid High Water Content Fluids HWCF 95 5 water glycol and oil emulsion fluids can be used in accordance with fluid manufacturer s recommendations Refer to instruction plate on unit reservoir machine and or ref erenced Fluid Recommendations bulletin Pump all fluid into reservoir thorough a clean see Section E for Beta ratings filter Fill reservoir to but not above high level mark on sight gage with hydraulic fluid Remove case drain line at the pump and fill pump case with hydraulic fluid Turn driveshaft a few times by hand with a spanner wrench to be sure parts are free Table 1 TORQUE TO TURN SHAFT Approx Torque to Turn Shaft 04 06 10 11 15 20 25 34 45 60 23 28 40 4 5 10 8 11 3 1993 THE OILGEAR COMPANY ALL RIGHTS RESERVED With pump under no load or with pump control at neutral turn drive unit on and off several times before allowing pump to attain full speed The system can usually be filled by running the pump and operating the control Watch the fluid level in the reservoir and stop pump if the level reaches low level mark Add fluid and start again With differential cylinder systems fluid must not be above high level when ram is retracted or below low level when extended Bleed air from the system by opening air
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