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Contents
1. 1 Gear loose on frame www Seerne GEAR AND PUMP 5 ee Correction 1 Slight hiss is normal and in no way affects steering Do not re place valve unless hiss is ex tremely objectionable A replacement valve will also exhibit slight noise and is not always a cure for the ob jection Investigate clearance around flexible coupling rivets Be sure steering shaft and gear are aligned so flexible coupling rotates in a flat plane is not distorted as shaft rotates Any metal to metal contacts through flexible coupling will transmit valve hiss into pas senger compartment through the steering column 1 Check gear to frame mounting screws Tighten bolts to specifications 2 Steering linkage looseness 2 Check linkage pivot points for wear Replace if necessary 3 Pressure touching other of 3 Adjust hose position Do not bend tubing by hand MM M 4 Loose pitman shaft over center adjustment slight rattle may oc cur on turns because of increased clearance off the high point This is normal and clearance must not be reduced below specified limits to elimi nate this slight rattle 4 Adjust to specifications e _ Squawk noise steering gear when turning or re covering from a2. Figure 3F 29 Installing Rack Piston d Turn the stub shaft clockwise with a 3 4 twelve point socket or box end wrench to thread the rack piston onto the worm while holding Tool J 7539 against the end of the worm e When the rack piston is completely threaded on the worm remove Retainer J 7539 and Seal Compressor J 8947 Install a new O ring in the side cover and retain with heavy grease Most integral b Turn the stub shaft until the rack piston teeth are cen tered in the pitman shaft opening then install the pitman shaft and side cover so that the center tooth of the pitman shaft engages the center groove of the rack piston c Install new side cover bolts and tighten to specifications 7 Install the rack piston plug in the rack piston and torque to 75 ft lbs Figure 3F 30 8 Install a new housing end cover O ring and lubricate it with Power Steering Fluid Install the end cover and retaining ring TORQUE END PLUG TO 75 LB FT 3F 45 Figure 3F 30 Installing Rack Piston Plug 9 Adjust the over center sector preload as follows a Make sure the pitman shaft over center adjusting screw is backed all the way out Then turned back in 1 2 turn b Install an inch lb torque wrench with a 3 4 12 point socket on the stub shaft splines c Rotate the stub shaft from one stop to the other Count the number of turns and locate the center of travel then check the combined ball and t
3. 17 Insert both stud bolts and tighten with proper sized wrenches 25 40 ft 1b 18 Install new O ring on union and lubricate with Power Steering Fluid Make sure O ring is in the groove next to the head hex Insert union in flow control valve hole in back of reservoir and tighten with proper size wrenches 25 40 ft lbs 19 Check for bind in pump by rotating drive shaft Shaft must rotate freely by hand 27 www CAMBLPOWER STEERING GEAR AND PUMP 9b 4E 1 35 ASSV ONIS 1 35 ONIY ASSY JATVA TOULNOD 5 a J LINDVIN m ed 31V1d 34055344 1v3s ONT Oo 31V1d 1V3S N 0 TaMOdqQ 31V1d 15 8 1 13 5 ONIX Y zi j 01 SINVA 31V ld pou 31vd 30055334 NOINN 1V3S ONIX MI3YIS SNINIV138 31V1d SNI3dS WuIOA33S33 JIOAAYISA 1 qnis ONILNNOW Figure 3F 46 Exploded View Oil Pump 28 1975 BUICK SERVICE MANUAL TeamBuick com nr LEVE A SPECIFICATIONS Tightening Specifications Use a reliable torque wrench to tighten the parts listed to insure proper tightness without training or distorting parts These specifications are for clean and lightly lubricated threads only Dry or dirty threads produce increased friction which prevents accurate measurements of tightness Gear
4. Loosen the adjuster plug lock by using a drift 4 Loosen the adjuster plug 1 turn Figure 3F 32 5 Turn the stub shaft to the right stop and then back 1 2 turn 3F 21 6 Using an in lb torque wrench on the stub shaft meas ure the drag torque 7 Bottom out the adjuster plug firmly clockwise avoid excessive torque At this stage there must be no axial lash in the assembly Then back off the adjuster plug counter clockwise to obtain 3 4 in Ib stub shaft torque in excess of the drag torque Example drag torque reading 3 in lbs Total torque reading without adjuster plug tightened 6 7 in Ibs 8 the adjuster plug locknut securely while hold ing the adjuster plug in position with spanner J 7624 tool Preload torque tends to drop off when the lock nut is tightened Therefore the torque reading must be re checked with the lock nut tight and the torque must still be 3 4 in lb in excess of the seal drag It is not possible to properly adjust the thrust bearing preload unless the adjuster plug is firmly bottomed out and the torque set while the adjuster plug is being loos ened Never attempt to adjust the thrust preload while tightening or advancing the adjuster plug into the gear assembly PITMAN SHAFT OVER CENTER SECTOR ADJUSTMENT 1 Turn the stub shaft from stop to stop counting the total number of turns Divide this number by 2 Starting at either stop turn the stub shaft 1 2
5. Tight or frozen steer 9 Replace bearings ing shaft bearings 10 Rubber spacer binding 10 Make certain spacer is properly seated Lubricate inside diameter with silicone 11 Sticky or plugged valve 11 Remove and clean or replace spool valve M a 12 Steering gear adjust 12 Check adjustment with gear out ments tight of vehicle Adjust as required Car pulls to one side or 1 Front end misaligned 1 Adjust to specifications the other Keep in mind road condition and wind Test car on flat road going in both directions 2 Tire pull Radial 2 Check tires for running true Tires under load 3 Unbalanced steering 3 Replace valve gear valve If this is cause steer ing effort will be very light in direction of lead and heavy in op posite direction Momentary increase in 1 Low oil level in pump 1 Add power steering fluid as effort when turning required wheel fast to right or left 2 Pump belt slipping 2 Tighten or replace belt 3 High internal leakage 3 Check pump pressure see pump pressure test lt Steering wheel surges 1 Low oil level 1 Fill as required Jerks when turning with engine running especial ly during parking 3F 8 1975 BUICK SERVICE MANUAL T eamBuick com Condition Possible Cause Correction 2 Loose pump belt 2 Adjust tension to specification 3
6. bearing over Tool J 6221 with the bearing manufactur er s identification against the tool and drive the bearing into the adjuster plug until the end of bearing is flush with bottom surface of stub shaft seal bore Place a block of wood under plug to protect it 2 Lubricate new stub shaft seal with power steering oil and install seal with spring in seal toward adjuster plug using Tool J 5188 See Figure 3F 15 Install seal only far enough in plug to provide clearance for dust seal and retaining ring Place new dust seal with lip up in plug then install retaining ring with Internal Pliers J 4245 4 Lubricate the thrust bearing assembly with Power Steering Fluid Place the flanged thrust bearing washer on the adjuster plug hub then install the upper thrust bearing small bearing washer and spacer grooves of spacer away from bearing washer J 5188 ADJUSTER PLUG 3F 25 Figure 3F 15 Installing Seal 5 Install a new bearing retainer on the adjuster plug by carefully tapping on the flat surface of the retainer Figure The projections must not extend beyond the spacer when the retainer is seated The spacer must be free to rotate VALVE AND STUB SHAFT Disassembly It is very uncommon to have to make any Service repairs www Caterina GEAR AND PUMP 15 UPPER THRUST BEARING amp RACES ADJUSTER PLUG 3F 26 Figure 3F 16 Installing Retainer to the valve assembly with the poss
7. ring with Power Steering Fluid and install in groove on adjuster plug Place Seal Protector J 6222 over stub shaft then install the adjuster plug assembly in the housing until it seats against the valve body Remove Seal Protector 4 Adjust thrust bearing preload as follows a Using spanner wrench J 7624 tighten adjuster plug up snug clockwise Back adjuster plug off 1 4 turn and measure seal drag using 3 4 12 point socket and in lb torque wrench b Bottom out the adjuster plug again snugly clockwise avoid excessive torque Then back off the adjuster plug counterclockwise obtain 3 4 in lbs in excess of the seal drag measured in Step 4a or a maximum of 10 200 inches at rim of adjuster plug whichever comes first Tighten the adjuster plug locknut securely while holding adjuster plug in position with Tool J 7624 Preload torque tends to drop off when the locknut is tightened Therefore the torque reading must be re checked with the locknut tight and the torque must still be 3 4 in Ibs in excess of the seal drag 5 Install the rack piston as follows a Lubricate the rack piston teflon seal with Power Steer ing Fluid b Position Seal Compressor J 8947 against the shoulder in the housing With Ball Retainer J 7539 in place in the rack piston push the rack piston with teeth toward pitman shaft opening into the housing until Tool J 7539 contacts the center of worm Figure 3F 29 RACK PISTON NUT
8. 5 Start engine allow system to reach operating temperatures and check fluid level adding any fluid if required When engine is at normal operating temperature the initial pressure read on the gauge valve open should be in the 80 125 PSI range Should this pressure be in excess of 200 PSI check the hoses for restrictions and the pop pet valve for proper assembly 6 Close gate valve fully three times Record the highest pressures times Record the highest pressures attained each time Do not leave valve fully closed for more than five seconds as the pump could be damaged internally a If the pressures recorded are within the listed specifications and the range of readings are within 50 PSI the pump is functioning within specifications Ex Spec 1350 1450 PSI readings 1370 1375 1380 M M 3F 10 1975 BUICK SERVICE TeamBuick com r ha sms Condition Possible Cause Correction ias a b If the pressures recorded are high but do not repeat within 50 PSI the flow controlling valve is stick ing Remove the valve clean it and remove any burrs using crocus cloth or fine hone If the system contains some dirt flush it If it is exceptionally dirty both the pump and the gear must be completely disassembled cleaned and reas sembled before further usage c If t
9. POWER STEERING GEAR Reassembly 1 Lubricate the worm lower thrust bearing and the two thrust washers with Power Steering Fluid then install one thrust washer the bearing and the other thrust washer over the end of the worm Figure 3F 26 2 Lubricate the valve body teflon rings and a new lower shaft cap O ring with Power Steering Fluid Install the lower shaft cap O ring the valve body so it is seated against the lower shaft cap Align the NARROW NOTCH in the valve body with pin in the worm then install the valve and shaft assembly in the gear housing Apply pressure to the VALVE BODY when installing If pressure is applied to the lower shaft during installation the shaft may be forced out of the valve body Figure 3 27 VALVE BODY STUB SHAFT WORM SHAFT LOWER THRUST BEARING O RING Sij NOTE IF GEAR IS BEING REASSEMBLED MAKE SURE OF ANGLE OF THRUST RACES ARE AS SHOWN 4 LOWER THRUST BEARING RACES 5B3F26 Figure 3F 26 Installation of Thrust Washers 3F 31 Figure 3F 27 Installing Valve Assembly VALVE ASSEMBLY D RETURN HOLE MUST BE FULLY UNCOVERED 3F 32 Figure 3F 28 Valve Assembly Installed 20 1975 BUICK SERVICE Team Bul and side cover follows valve body is properly seated when the return hole in the housing is entirely uncovered Figure 3F 28 3 Lubricate a new adjuster plug O
10. Part Location Thread Torque Size Lb Ft Bolt Gear Housing to Frame 7 16 14 70 Bolt Lower Coupling Flange to Worm Shatt 3 8 24 30 Nut Steering Column Coupling to Steering Gear Shaft aun ecc TT 5 16 24 20 3 8 24 20 Bolt Gear Side Cover to 5 3 8 16 45 Nut Pitman Arm to Pitman Shaft A B C E Series Special 180 H SONGS sivas cuts aa A Sans Tax Special 140 Nut Adjuster Plug Locking Special 80 Nut Pitman Shaft Lash Adjuster Locking Special 35 Plug Rack Piston Nut Special 75 Screw Ball Return Guide Retainer 1 4 28 5 Pump Fitting Pump Discharge Part 5 8 18 35 Nut Pump to Mounting 3 8 16 35 Bolt Pump Mounting Bracket to ENQINE 3 8 16 35 Fitting Pressure Hose to Pump 5 8 18 35 Fitting Pressure Hose to Gear 11 16 18 35 Fitting Return Hose to 5 8 18 35 Gear Specifications Gear hp CL Recirculating Ball Worm a
11. Steering linkage hit 3 Correct clearance ting engine oil pan at full turn 4 Insufficient pump 4 Check pump pressure See pump pressure pressure test Replace relief valve if malfunctioning 5 Sticky flow control 5 Inspect for varnish or damage valve Replace if necessary Excessive wheel kick 1 Air in system 1 Add oil to pump reservoir and back or loose steering gt bleed by operating steering Check hose connectors for proper torque and adjust as required 2 Steering gear loose on 2 Tighten attaching screws to frame specified torque 3 Steering gear flexible 3 Tighten flange pinch bolts to 30 coupling loose on shaft ft lbs if serrations are not or rubber disc mounting damaged Tighten upper flange to screws loose coupling nuts to specified torque 4 Steering linkage joints 4 Replace loose pivots worn enough to be loose 5 Front wheel bearings 5 Adjust bearings or replace with incorrectly adjusted or new parts as necessary worn 6 Worn poppet valve 6 Replace poppet valve gear 7 Loose thrust bearing 7 Adjust to specification with gear preload adjustment out of vehicle gear 8 Excessive over center 8 Adjust to specification with gear lash out of vehicle Hard steering or lack of 1 Loose pump belt 1 Adjust belt tension to assist specification 2 Low oil level in 2 Fill to proper level If exces reservoir sively low check all lines an
12. entire range slowly a few times with engine running Re check oil level and inspect for possible leaks If air becomes trapped in the oil the oil pump may be noisy until all air is out of oil This may take some time since air trapped in oil does not bleed out rapidly DISASSEMBLY OF POWER STEERING GEAR Disassembly The following procedures are with the gear assembly removed from the vehicle If complete assembly is not to be overhauled remove the unit to be overhauled and proceed to the disassembly and assembly of that unit 1 Rotate end cover retainer ring so that one end of the ring is over the hole in the side of the housing Force the end of the ring from its groove and remove ring Figure 3 9 RING 3F 37 Figure 3F 9 Removing End Cover Retaining Ring 2 Turn the coupling flange counter clockwise until the rack piston just forces end cover out of housing Remove cover and discard O ring CAUTION DO NOT turn stub shaft any fur ther than absolutely necessary to remove the end plug or balls from rack piston and worm circuit may escape and lay loose inside the rack piston chamber 3 Remove the rack piston end plug as shown in Figure 3F 10 To aid in loosening end plug tap end plug with a brass drift of 1 diameter or larger 4 Remove the pitman shaft and side cover as follows a Loosen the over center adjusting screw lock nut and remove the 4 side cover attaching bolts b Rotat
13. the gear it is found that oil leakage exists at the pitman shaft seals the seals may often be replaced without removing gear assembly from car as fol lows 1 Remove pitman arm nut and disconnect pitman arm from pitman shaft using puller J 5504 See Figure 3F 8 Do not hammer on end of puller PITMAN SHAFT PITMAN ARM Figure 8 Removing Pitman Arm From Pitraan Shaft 2 Thoroughly clean end of pitman shaft and gear housing then tape splines on end of pitman shaft to insure that seals will not be cut by splines during assembly Only one layer of tape should be used an excessive amount of tape will not allow the seals to pass over it due the close tolerance between the seals and the pitman shaft 3 Remove pitman shaft seal retaining ring with snap ring pliers J 4245 4 Start engine and turn steering wheel fully to the left so that oil pressure in the housing can force out pitman shaft seals Turn off engine Use suitable container to catch oil forced out of gear This method of removing the pitman shaft seals is recommended as it eliminates the possibility of scoring the housing while attempting to pry seals out 5 Inspect seals for damage to rubber covering on O D IF O D appears scored inspect housing for burrs Remove any burrs before installing new seals Also inspect for any other defects Installation 1 Lubricate the seals thoroughly with power steering fluid and install seals with installer J 6219 In
14. the power steering pump are the oil reservoir drive shaft pump housing cam ring pres sure plate thrust plate flow control valve and rotor and vane assembly Figure 3F 3 The pump housing and com ponent parts are encased in the oil reservoir The reservoir filler cap has a dipstick attached to show the oil level in the reservoir There are two bore openings at the rear of the pump housing The larger of these openings contains the cam 3F 2 1975 BUICK SERVICE MANUAL TeamBuick com RACK PISTON NUT T BACK UP O RING GEAR HOUSING PITMAN SHAFT ROTARY VALVE ASSEMBLY BECK ADJUSTER VALVE PLUG STUB SHAFT UPPER THRUST BEARING LOWER THRUST BEARING SNAP RING B C E SERIES 1 Figure 3F 1 Power Steering Gear Cutaway BODY VALVE BODY PRESSURE PORT SPRING RETURN PORT DAMPER O RING TORSION BAR O RING SEAL TORSION BAR VAL BODY RINGS VALVE SPOOL 4B3F2 Figure 3F 2 Rotary Valve Assembly ring pressure plate thrust plate rotor and vane assembly and end plate Figure 3F 3 The smaller opening contains the pressure line union flow control valve and spring The flow control orifice is part of the pressure line union Figure 3F 4 A pressure relief valve inside the flow control valve limits pump pressure A magnet is installed in the pump housing attached by its magnetic force The magnet will pick up metal impurities in the oil I
15. the total number of turns This is the center of the gear The flat on the stub shaft is normally up and parallel with the side cover when the gear is center Figure 3F 33 and the block tooth on the pitman shaft is in line with the over center preload adjuster Figure 3F 34 4B3F33 Figure 3F 33 Stub Shaft Parallel with Side Cover 2 Rotate the torque wrench approximately 45 degrees each side of center and read near or on center highest reading Figure 3F 35 Loosen the lock nut and turn the preload adjusting screw CW until the correct O center torque in excess of the reading just taken is obtained Limits for new and used gears are different as fol lows e ave mo cab 4B3F 34 Figure 3F 34 Block Tooth of Pitman Inline with Preload Adjuster Figure 3F 36 Marking Housing NG hem ter torque to be 4 8 Ibs in addi tional torque but total over center torque must not exceed 18 Ib in b Used gear 400 or more miles Over center torque to be 4 to 5 Ibs in additional torque but total over center must not exceed 14 Ibs in Tighten the lock nut to 35 ft Ibs while holding the pre load adjuster screw Recheck the O center adjustment Ifa gear is known to contain the new thrust bearing parts thrust bearing adjustment in service is greatly simplified Recommended procedure 1 Turn the adjuster plug in clockwise until the plug and thrust bearing are firmly botto
16. turn Chirp noise in steering pump Belt squeal particu larly noticeable at full wheel travel and stand Still parking Growl noise in steering pump 1 Dampener ring on valve spool cut 1 Loose belt 1 Loose belt 1 Excessive back pres sure in hoses or steering gear caused by re striction 1 Replace dampener O ring 1 Adjust belt tension to specification 1 Adjust belt tension to specification 1 Locate restriction and correct Replace part if necessary M M 6 1975 BUICK SERVICE eamBuick com Condition Possible Cause Correction Growl noise in steering 1 Scored pressure plates 1 Replace parts and flush system pump particularly thrust plate or rotor noticeable at standstill parking 2 Extreme wear of cam 2 Replace parts ring Groan noise in steering 1 Low oil level 1 Fill reservoir to proper level pump 2 Air in the oil Poor 2 Tighten connector to specified pressure hose connection torque Bleed system by operating steering from right to left full turn 3 Loose bolt in pump 3 Tighten to specifications mounting Rattle or knock noise 1 Loose pump pulley nut 1 Tighten nut to specified torque in steering pump Rattle noise in steering 1 Vanes not installed 1 Install properly pump properly 2 Vanes sticking in rotor 2 Free up by removing burrs slot
17. 5B3F51 SUPPORT WASHER PULLEY BOLT 1520 FT wASHER WASHER gt 1520 BOLT amp FRONT OF CAR WASHER 5B3F52 Figure 3F 52 X Series Pump Mounting L 6 Non 3F 32 1975 BUICK SERVICE MANWALV eamBuick com WASHER BRACE FRONT OF CAR ASHER 4f NUT PULLEY 5B3F53 WASHER PUMP PUMP SUPPORT LOWER 20 30 FT 3 ALAN A HOSE INLET HOSE OUTLET PIPE CLAMP OUTLET SUPPORT 20 20 FT LOWER HOSE OUTLET PIPE OUTLET DD 55 li SK SN STEERING GEAR Go NAAN S AN S ERES So INSTALLATION ANGLE TO BE SET BY ROTATING PIPE 1 TO CONTACT MOUNTING SUPPORT ROUTE PIPE ASSEMBLY PARALLEL TO OF STEERING GEAR OF STEERING JERE y t FRAME VIEW B FRONT CAR 5 54 Figure 3F 54 X Series Hose Routing 1 6 www GEAR AND PUMP ar aa PULLEY PULLEY EXCLUDING AIR CONDITIONING THIS BRACE HOLE PULLEY AND BRACE TO I PUMP ASSEMBLY EXCLUDING AIR CONDITIONING LINK WASHER BOLT FROM ENGINE MOUNT SUPPORT Fesso rr BOLT LOCK WASHER WASHER PUMP ASSEMBLY TO LINK 5B3F55 Figure 3F 55 X Series Power Steering Pump Mounting 260 8 queues POSITION CLAMP ON HOSE pu N y BETWEEN FIRST SECOND BEAD INSTALL HOSE OVER FIRST BEAD O
18. Install 5 Tighten lock nut hand plug to maintain alignment 6 Using an in Ib torque wrench turn the stub shaft to the right stop then back 1 4 turn Measure the torque Read ing should be taken at near vertical while turning counter clockwise Figure 3 38 If reading is less than 4 or more than 10 in lbs use the other procedure listed REMOVAL AND INSTALLATION OF OIL PUMP SHAFT SEAL WITH PUMP ASSEMBLED Removal 1 Remove pump as outlined in Oil Pump Assembly Re moval and Installation 2 Insert a piece of 005 shim stock approximately 2 1 2 long around shaft and push it past seal until it bottoms in pump housing See Figure 3F 40 3 Remove seal by cutting metal body of seal with a sharp tool and prying out See Figure 3F 40 Extreme care must be used to prevent damage to shaft and pump housing Figure 3F 40 Removing Oil Pump Shaft Seal Installation 1 Place seal protector J 7586 over shaft Lubricate new seal with power steering oil and drive in pump housing spring side first with installer J 7728 See Figure 3F 41 Just bottom seal in housing Excessive force must not be used when driving seal in place Figure 3F 41 installing Seal 3 Install pulley and drive belt Adjust belt tension to specification outlined in Section 6B 4 Fill pump reservoir to proper level with power steering oil and bleed pump REMOVAL AND INSTALLATION OF OIL PUMP FLOW CONTROL VALVE Rem
19. N PIPE AND AGAINST SECOND BEAD PRESSURE POSITION PRESSURE HOSE PIPE AGAINST POWER STEERING BRACE AS SHOWN LIA TYPICAL HOSE CLAMPING HOSE pua EXCEPT AT PUMP END RETURN DI P Za CLAMP BOTH ENDS RETURN cA FRONT OF CAR PUSH HOSE ON PIPE CLAMP TO BEND IN PIPE POSITION PRESSURE HOSE HOSE CLAMPING PUMP END PIPE AGAINST SIDE COVER AS SHOWN 5B3F56 Figure 3F 56 X Series Power Steering Hose Routing 260 V8 3F 34 1975 BUICK SERVICE Team Buick com BRACKET REAR WASHER ENGINE SIZE IDENTIFICATION NUMBERS ARE STAMPED ON BRACKET 7 Figure 3F 57 X Series Power Steering Pump Mounting 350 V 8 and 231 V 6 less HOSE RETURN Ca SEPA HOSE PRESSURE CLAMP HOSE RETURN VIEW A DO NOT BEND OR DISTORT PIPES TO FACILITATE INSTALLATION AFTER TIGHTENING NUTS PRESSURE PIPE TO BE AGAINST GEAR SIDE COVER AS SHOWN AFTER TIGHTENING NUT PIPE TO LIE AGAINST PUMP AS SHOWN HOSES MUST BE INSTALLED TO CLEAR EACH OTHER AND ALL SURROUNDING PARTS MINIMUM CLEARANCE 50 RETURN HOSE MUST NOT BE TWISTED DURING INSTALLATION HOSE ENDS MUST BE KEPT FREE FROM DIRT AND OTHER CONTAMINATES 5B3F58 Figure 3F 58 X Series Power Steering Hose Routing 350 V 8 Www eam BLReWER STEERING GEAR AND PUMP 35 HOSE PRESSURE HOSE RETURN HOSE PRESSURE CLAMP HOSE RETURN VIEW A DO NOT BEND OR DIS
20. NS EXTEND ABOVE THE FLANGE BY THICKNESS OF FLANGE AFTER ASSEMBLY RUBBER DISC OF FLEXIBLE COUPLING MUST BE FLAT WITHIN 060 VIEW A 5B3F67 Figure 3F 67 A B C E Series Steering Gear Coupling
21. Remove pump pulley using J 25034 3 Remove reservoir cap and drain out oil in pump reser voir 4 Clamp front hub of pump in vise so that the extending portion of shaft is directed downward being careful not to clamp vise too tight as this may distort the bearing 5 Using proper sized wrenches remove union and O ring assembly and both mounting studs from back of reservoir Discard all seals and O rings Figure 46 6 Reservoir may then be removed from housing by rock ing it slightly back and forth to unseat the O ring Remove O ring and discard 3F 25 7 Remove both mounting stud and union seals from counterbored spaces between reservoir and housing Dis card these seals also 8 Remove the end plate retaining ring by inserting a small punch in the 1 8 inch diameter hole in the housing side opposite the flow control valve hole Compress the retaining ring with the punch and remove by inserting a screwdriver under the ring and twisting the screwdriver Figure 3F 42 RETAINING RING Figure 3F 42 Removing End Plate Retaining Ring 9 Remove end plate and end plate O ring End plate is spring loaded and will generally sit above the housing level for ease of removal If sticking should occur a slight rocking action of the end plate should be used to free it 10 Remove pump from vise and invert Flow control valve and valve spring will fall free 11 With end cover O ring and shaft key remov
22. ST PRESSURE HOSE PIPE AS SHOWN 2 PRESSURE a 20 30 LB FT HOSES MUST BE INSTALLED TO CLEAR EACH OTHER AND SURROUNDING PARTS RETURN HOSE MUST NOT BE TWISTED DURING INSTALLATION HOSE TO HOSE MINIMUM CLEARANCE 1 00 SURROUNDING PARTS MINIMUM CLEARANCE 50 HOSE ENDS MUST BE MEWA KEPT FREE FROM DIRT amp OTHER CONTAMINATES B C E SERIES AFTER TIGHTENING NUT PIPE LIE AGAINST PUMP ASM AS SHOWN HOSE PRESSURE NUT 20 30 LB FT HOSE RETURN VIEW A CLAMP A SERIES 5B3F63 Figure 3F 63 B C E Series Hose Routing 455 FRAME LEFT SIDE RAIL BOLT 60 80 LB FT BOLT 2 60 80 LB FT M 5B3F64 Figure 3F 64 A Series Power Steering Gear Installation 3F 38 1975 BUICK SERVICE wXRUAU T eam Buick com GEAR FRAME LEFT SIDE RAIL 5B3F65 Figure 3F 65 B C E Series Power Steering Gear Installation SHIELD UPPER L12 B C E LOCATE CLIP WITHIN THIS DISTANCE AND IN DIRECTION SHOWN CLIP REAR FRONT CAR SHIELD UPPER SHIELD UPPER L SHIELD UPPER SHIELD LOWER Sere rece SHIELD LOWER SECTION THRU SNAP TABS SECTION THRU LOCK TABS SECTION THRU GUIDE ALL SECTIONS ARE IN ASSEMBLED POSITION 5B3F66 Figure 3F 66 A B C E Series Steering Coupling Shield www Team ine GEAR AND PUMP 3F 39 GEAR NUT WASHER 15 25 LB FT COLUMN WASHER NUT 15 25 LB FT A PIN SHOULD BE CENTERED IN FLANGE SLOTS ANB ENDS OF PI
23. TORT PIPES TO FACILITATE INSTALLATION AFTER TIGHTENING NUT PIPE TO A BE AGAINST GEAR AS SHOWN RETURN HOSE PIPE TO BE AGAINST PRESSURE HOSE PIPE AS SHOWN AT X AFTER TIGHTENING NUT PIPE TO LIE AGAINST PUMP AS SHOWN HOSES MUST BE INSTALLED TO CLEAR EACH OTHER AND ALL SURROUNDING PARTS MINIMUM CLEARANCE 50 RETURN HOSE MUST NOT BE TWISTED DURING INSTALLATION HOSE ENDS MUST BE KEPT FREE OF DIRT AND OTHER CONTAMINATES 59 BRACKET VA BRACKET 5B3F60 Figure 3F 60 A B C E Series Pump Mounting 350 and 455 less A I R 36 1975 BUICK SERVICE MANUAL TeamBuick com BRACKET PUMP FRONT 5B3F61 POWER STEERING RETURN HOSE POWER STEERING PRESSURE A DO NOT BEND OR DISTORT PIPES FACILITATE INSTALLATION AFTER TIGHTENING NUT PIPE TO BE AGAINST GEAR SHOWN HOSES MUST BE INSTALLED TO CLEAR EACH OTHER AND ALL SURROUNDING PARTS RETURN HOSE MUST NOT BE TWISTED DURING INSTALLATION HOSE ENDS MUST BE KEPT FREE FROM DIRT AND OTHER CONTAMINATES HOS PRESSURE AFTER TIGHTENING NUT PIPE TO LIE AGAINST PUMP ASSEMBLY AS SHOWN 5B3F62 Figure 3F 62 A B Series 350 Hose Routing www Team GEAR AND PUMP 3F 37 HOSE HOSE RETURN HOSE RETURN PRESSURE A 00 NOT BEND OR DISTORT PIPES TO FACILITATE INSTALLATION AFTER TIGHTENING NUT PIPE TO BE AGAINST GEAR AS SHOWN RETURN HOSE PIPE HOSE 7 NUT TO BE AGAIN
24. V 8 Engine Figures 1 Remove the adjusting nut on the back of the pump 2 Remove the pump bracket to A VRV Urackeptiltsrif 3 67 GEAR AND PUMP equipped 3 Remove the pump bracket to engine bracket bolts 4 Place pump belt out of way 5 Disconnect the return ana pressure hoses from pump Cover the hose ends and unions on pump to prevent dirt from entering 6 Remove pump and bracket 7 Remove pulley with puller J 25034 remove pulley 8 Remove the two pump bracket to pump bolts Installation 1 Reinstall pump bracket to pump bolts and torque 2 Reinstall pulley on pump with Tool J 25033 3 Reinstall pump and bracket on engine 4 Install pump bracket to A LR bracket bolts if equipped and rear of pump adjusting nut Do not torque at this time 5 Reinstall pump hoses torque as specified 6 Adjust belt as per Maintenance and Adjustment Section of this group Removal L 6 Engine Figure 1 Remove the front pump to support bracket bolt 2 Loosen the bolt in front and nut in back securing the pump to the lower support 3 Remove belt and oil lines 4 Remove bolt in front and nut on back of lower support and remove pump Installation L 6 Engine 1 Reverse the removal procedure for installation 2 Adjust belt as per Maintenance and Adjustment Section of this group DISASSEMBLY INSPECTION AND REASSEMBLY OF POWER STEERING OIL PUMP Disassembly 1 Remove oil pump front vehicle 2
25. VALVE 0 N RINGS 3 O RINGS 3 N INSTALLED UNDER TEFLON RINGS 2 VALVE BODY STUB SHAFT 3F 29 o M Figure 3F 19 Exploded View of Valve Body and Shaft Assembly 1 If valve body O rings and teflon rings were removed install new O rings in the oil ring grooves and lubricate with power steering fluid 2 Lubricate the three new teflon oil rings with power Steering fluid and install in grooves over O rings The teflon rings may appear to be distorted but the heat of the oil during operation of the gear will straighten them out 3 Lubricate the spool valve dampener O ring with Power Steering Fluid and install over the spool valve 4 Lubricate the spool valve and valve body with Power Steering Fluid and slide the spool valve into the valve body Rotate the spool valve while pushing it into the valve body being careful not to cut O ring Push the spool valve on through the valve body until the shaft pin hole is visible from the opposite end spool valve flush with shaft cap end of valve body 5 Lubricate the shaft assembly with Power Steering Fluid and carefully install it into the spool valve until the shaft pin can be placed into the spool valve 6 Align the notch in the shaft cap with the pin in the valve body and press the spool valve and shaft assembly into the valve body Figure 3F 20 NOTCH IN WWW SAM UPOWEBGTEERING GEAR AND PUMP 3F 17 a didic
26. card seals 5B3F23 Figure 3F 23 Prying Out Inner Seal 07 SINGLE itr BEARING LIP SEAT SEAL RETAINING BACK UP WASHERS RING 5B3F24 Figure 3F 24 Pitman Shaft Seals 2 If pitman shaft needle bearin MMAM B LPGWERSTEBRING GEAR AND PUMP 19 remove with Tool J 6657 Since this bearing is shouldered it must be pressed out the pitman shaft end of the housing Figure 3F 25 Figure 3F 25 Removing Pitman Shaft Needle Bearings Assembly 1 Clean parts and lubricate with power steering oil If pitman shaft needle bearing was removed because of dam age install new needle bearing into gear housing bore from seal bore end pressing against stamped identification on bearing with Tool J 22407 Press in until bearing clears shoulder in gear housing 1 32 maximum Rollers bearing must be free to rotate 2 Lubricate new pitman shaft seals with power steering oil Install the inner single lip seal in bore first then a back up washer See Figure 3F 23 Using Tool J 6219 drive the seal and washer in far enough to provide clear ance for the outer seal back up washer and retaining ring The seal must not bottom on the counterbore Install the outer double lip seal and the second back up washer only far enough to provide clearance for the retain ing ring with Tool J 6219 Install retaining ring with Tool J 4245 making certain that ring 15 seated properly REASSEMBLY OF
27. ck piston remove ball return guide clamp guide halves and balls 2 If necessary to replace the teflon oil seal and O ring remove at this time Cleaning and Inspection 1 Wash all parts in clean solvent and dry with compressed air 2 Inspect gear housing bore If badly scored or worn replace housing 3 Inspect the worm and rack piston grooves and all the balls for excessive wear or scoring Inspect rack piston nut teeth for pitting wear or scoring Inspect O D of rack piston nut for wear scoring or burrs If either the worm or rack piston nut need replacing both must be replaced as a matched assembly 4 Inspect ball return guides making sure that the ends where the balls enter and leave the guides are not da maged Replace if necessary 5 Inspect lower thrust bearing and races for wear pitting scoring or cracking Replace any damaged parts Assembly 1 Thoroughly clean and lubricate the internal parts with power steering oil 2 Lubricate and install new teflon oil seal and O ring in groove on rack piston nut Place a new piston ring over the back up O ring See Figure 3F 21 PISTON BACK UP RING O RING MUST BE INSTALLED RACK PISTON UNDER PISTON NUT RING 3F 40 Figure 3F 21 Installing Ring on Rack Piston 3 Install worm into rack piston nut to bearing shoulder 4 Align the ball return guide holes in the rack piston nut with the worm groove Figure 3F 22 i 5 Lubricate the ba
28. d Low oil level will also joints for evidence of external result in excessive pump leakage Tighten loose connectors noise to specifications 3 Steering gear to column 3 Align steering column misalignment 4 Lower coupling flange 4 Loosen pinch bolt and assemble rubbing against steering properly gear adjuster plug Condition If checks 1 5 do not reveal cause of hard www Team BUIBSwWEASTterinc GEAR AND PUMP 9 PUN DS Possible Cause Correction A _ _ C M 5 Tires not properly 5 Inflate to recommended pressure inflated Further possible causes In order to diagnose conditions could be such as listed in 6 7 8 and 9 a steering follow the pro cedure below to deter mine fault test of the entire power steering system is required 6 Sticky flow control valve 7 Insufficient pump pressure output 8 Excessive internal pump leakage 9 Excessive internal gear leakage POWER STEERING SYSTEM TEST PROCEDURE 1 Disconnect pressure hose at union of pump use a small container to catch any fluid which might leak 2 Connect a spare pressure hose to pump union 3 Using Pressure Gauge J 5176 1 Adapter Fitting J 22326 connect gauge to both hoses 4 Open hand valve on gauge
29. e the side cover until the rack piston and pitman RACK PISTON NUT END PLUG 38 Figure 3F 10 Removing Rack Piston End Plug shaft teeth are visible then turn the coupling flange until the pitman shaft teeth are centered in the housing opening Tap the pitman shaft with a soft hammer and remove the pitman shaft and side cover from the housing Remove the side cover gasket Discard if damaged 5 Remove the rack piston as follows a Insert Ball Retainer Tool J 21552 into the rack piston bore with pilot of tool seated in the end of the worm Turn stub shaft counter clockwise while holding tool tightly against worm The rack piston will be forced onto the tool Figure 3F 11 Hold tool and pull rack piston farther onto tool to prevent end circuit balls from falling out b Remove the rack piston with Ball Retainer Tool from gear housing MRACK PISTON NUT 3 4 SOCKET WORM J 21552 5B3F Figure 3F 11 Removing Rack Piston 6 Remove the adjuster plug as follows a Loosen the adjuster plug locknut and remove b Remove adjuster plug assembly with Spanner Wrench J 7624 Remove and discard the plug O ring 14 1975 BUICK SERVICE MANUAL TeamBuj 0 vate Ceo being careful not to score the 7 Grasp the lower shaft and pull the valve assembly from the housing bore Separate worm and valve and remove the lower shaft cap O ring and discard 8 If the worm or the lo
30. ealign the spool valve then remove Figure 3F 18 Removing Spoo Valve 4 Remove dampener O ring from the spool valve and discard 5 If the teflon oil rings are to be replace cut the three teflon oil rings and O rings from the valve body and discard Cleaning and Inspection 1 Wash all parts in clean solvent and blow out all oil holes with compressed air 2 If the drive pin the the stub shaft or valve body is cracked excessively worn or broken replace the com plete valve and shaft assembly 3 If there is evidence of leakage between the torsion bar and the stub shaft or scores nicks or burrs on the ground eam Su CO Dan that cannot be cleaned up with crocus cloth the entire valve assembly must be replaced 4 Check the outside diameter of the spool valve and the inside diameter of the valve body for nicks burrs or bad wear spots If the irregularities cannot be cleaned up by the use of crocus cloth the complete valve and shaft as sembly will have to be replaced 5 If the small notch in the skirt of the valve body is excessively worn the complete valve assembly will have to be replaced 6 Lubricate the spool valve with power steering fluid and check the fit of the spool valve in the valve body with the spool valve dampener ring removed If the valve does not rotate freely without binding the complete valve and shaft assembly will have to be replaced id pem
31. ed tap very lightly on end of shaft only until pressure plate falls free 12 Remove pressure plate shaft pump ring vanves and rotor 13 Remove shaft retaining ring and discard Some mod els do not have retaining rings 14 Remove rotor and thrust plate from shaft and both dowel pins from housing 15 Pry shaft seal out of housing being careful not to damage the housing bore discard the shaft seal 16 Remove clean and replace magnet ASSEMBLY OF PUMP Before beginning assembly of pump clean all metal parts in a nontoxic solvent Steps in Assembly of Pump 1 Install new pump shaft seal using seal protector J 3F 26 1975 BUICK SERVICE MANVAW eam BUGRE PAIS making sure thrust plate slides Figure 3F 43 Removing Rotor Retaining Ring 22616 and seal installer J 7728 or a inch socket with an arbor press or hammer Do not use any more force than necessary to seat the seal 1 SOCKET 5B3F44 Figure 3F 44 Installing Seal 2 Lubricate new pressure plate O ring with Power Steering Fluid and install in third groove from rear of housing 3 Clamp end hub of housing in vise in same position as before and insert both dowel pins Do not over tighten the vise damage to the bearing could occur 4 Insert shaft through the thrust plate and rotor and install new snap ring on shaft Open the snap ring just enough to slide over the end of shaft Rotor must have counter sunk side toward thr
32. essure supplied by the pump Manual steering is always available at times when the engine is not running or in the event of pump or belt failure Steering effort is increased under such conditions The steering stub shaft rotary valve worm shaft and rack piston assembly are all in line The rack piston in the variable ratio steering gear is modified to accommo date the larger center tooth on the pitman shaft gear All oil passages are internal within the gear housing except for the pressure and return hoses between the gear and the pump Figure 3F 1 The mechanical element of this steering gear is a low friction recirculating ball system in which steel balls act as a rolling thread between the steering worm and the rack piston The one piece rack piston assembly is geared to the sector of the pitman shaft The hydraulic rotary valve is concentric with the input shaft and is contained in the upper section of the gear housing It contains a spool that is held in neutral position by means of a torsion bar The spool is attached to one end of the torsion bar and the valve body to the other end Twisting of the torsion bar allows the spool to rotate in relation to the valve body therby operating the valve Figure 3F 2 Under normal driving conditions the steering wheel effort will range from 1 to 1 1 2 pounds and parking effort will range from 2 to 2 1 2 pounds DESCRIPTION OF POWER STEERING OIL PUMP The major components of
33. f the pump is disassembled the magnet should be cleaned DIAGNOSIS EXTERNAL LEAK DIAGNOSIS The following method can be used to locate most external system leaks 1 With the vehicle s engine off wipe the complete power steering system dry gear pump hoses and connections 2 Check oil level in pump s reservoir and adjust if neces sary 3 Start engine and turn steering wheel from stop to stop several times Do not hold in corner for any length of time as this can damage the power steering pump It is easier if someone else operates the steering wheel while you search for the seepage 4 Find the exact area of leakage See Figures 3F 5 3F 6 and 3F 7 5 Make the correct repair to stop the leak www GEAR AND PUMP 3F 3 CAP RESERVOIR O RING SEAL HOUSING THRUST PLATE SHAFT T pij SHAFT SEAL RESERVOIR HOLE PRESSURE RELIEF VALVE SPRING FLOW CONTROL 4 VALVE EXIT HOLE DIP STICK PUMP RING PRESSURE PLATE RETAINING RING DISCHARGE CAVITY SPRING RETAINING RING yen VANE SEALS ORIFICE 4 Figure 3F 3 Pump Cutaway PUMP PRESSURE UNION SPRING VALVE 4B3F4 Figure 3F 4 Flow Control Valve Leaks occuring near the upper end of the gear where the rotary valve is visible are not as easily pinpointed and more intense diagnosis may be necessary to make the correct
34. he pressures recorded are constant but more than 100 PSI below the low listed specification re place the flow control valve and recheck If the pressures are still low replace the rotating group 7 If the pump checks to specifica tions leave the valve open and turn or have turned the steering wheel into both corners Record the highest pressures and compare with the maximum pump pressure recorded If this pressure cannot be built in either or one side of the gear the gear is leaking internally and must be disassembled and repaired 8 Shut off engine remove testing gauge spare hose reconnect pres sure hose check fluid level or make needed repairs Foaming milky power steering fluid low fluid level and pos sible low pressure 1 Air the fluid and 1 Check for leak and correct loss of fluid due to in Bleed system Extremely cold temper ternal pump leakage atures will cause system aeriation causing overflow should the oil level be low If oil level is correct and pump still foams remove pump from vehicle and separate reservoir from housing Check welsh plug and housing for cracks If plug is loose or housing is cracked replace housing Low pressure due to steering pump 1 Flow control valve stuck 1 Remove burrs or dirt or replace or inoperative 2 Pressure plate not flat 2 Correct 3 Extreme wear of cam ring 3 Replace parts Flush system 4 Sc
35. hrust bearing preload by rotating the torque wrench through the center of travel Note the highest reading d Tighten the pitman shaft over center adjusting screw until the torque wrench reads 3 6 in lbs higher than the reading noted in Step c The total reading should not exceed 14 in Ibs e While holding the adjusting screw tighten the locknut to 35 ft Ibs using Adapter J 5860 and recheck the adjust ment ADJUSTMENTS OF POWER STEERING GEAR Worm Thrust Bearing All new power steering gears have conical bearing races on the input shaft lower thrust bearing Past model steering gears B GEAR AND PUMP thrust bearing races and all adjuster plug assemblies sup plied in service kits or entire gear assemblies supplied for service may contain those parts There will be occasions where these older parts are used in servicing gears in new cars In those cases where the flat races are being installed or whenever there is any uncertainty regarding the compo nents in an existing gear assembly the following proce dure will insure proper thrust bearing adjustment regardless of the race configuration 1 Loosen pitman shaft preload adjuster screw lock nut 2 Loosen the pitman shaft lash adjuster screw 1 1 2 turns and retighten the lock nut If it bottoms turn it back 1 2 turn Figure 3F 31 LASH ADJUSTER 4B3F31 Figure 3F 31 Pitman Shaft Adjuster 3
36. i e Ro ENGAGE PIN PROJECTING INTO VALVE BODY Figure 3F 20 Installing Stub Shaft CAUTION Make sure that the shaft cap notch is mated with the valve body pin before install ing valve body into the gear assembly 7 Lubricate new ring with Power Steering Fluid and install it in the shaft cap end of the valve body assem bly PITMAN SHAFT AND SIDE COVER Disassembly 1 Remove the locknut and unscrew the side cover from the adjusting screw Do not attempt to disassemble pitman shaft Discard locknut Cleaning and Inspection 1 Wash all parts in clean solvent and dry parts with compressed air 2 Check pitman shaft bearing surface in the side cover for scoring If badly worn or scored replace the side cover 3 Check the sealing and bearing surfaces of the pitman shaft for roughness nicks etc If minor irregularities in surface cannot be cleaned by use of crocus cloth replace the pitman shaft 4 Replace pitman shaft assembly if teeth are damaged or if the bearing surfaces are pitted or scored 5 Check pitman shaft lash adjusting screw It must be free to turn with not perceptible end play If adjusting screw is loose replace the pitmam shaft assembly Assembly 1 Thread the side cover onto the pitman shaft adjusting screw until it bottoms and then turn in 1 2 turn Install a new adjusting screw locknut but do not tighten RACK PISTON Disassembly 1 Thread the worm out of the ra
37. ible exception of the valve spool dampener O ring seal DO NOT disassem ble the valve unless absolutely necessary since this may result in damage to the assembly If the valve spool damp ener ring seal requires replacement remove the valve spool only replace the O ring and reinstall the spool immediately DO NOT disassemble further DISENGAGE STUB SHAFT PIN FROM HOLE IN SPOOL VALVE Figure 3F 17 Removing Stub Shaft Assembly 16 1975 SERVICE MANU Cleanliness of parts and work area is of the utmost impor tance during servicing of the valve assembly 1 Remove and discard the O ring in the shaft cap end of the valve assembly 2 To remove the stub shaft assembly from the valve body proceed as follows a While holding the assembly stub shaft down lightly tap the stub shaft against the bench until the shaft cap is free from the valve body See Figure 3F 17 b Pull the shaft assembly until the shaft cap clears the valve body approximately 1 4 Do not pull the shaft assembly out too far or the spool valve may become cocked in the valve body c Carefully disengage the shaft pin from the valve spool and remove the shaft assembly See Figure 3F 17 3 Push the spool valve out of the flush end of the valve body until the dampener O ring is exposed then care fully pull the spool from the valve body while rotating the valve See Figure 3F 18 If the spool valve becomes cocked carefully r
38. lls with Power Steering Fluid then feed 17 balls into the rack piston while slowly rotating the worm counter clockwise The black balls are 0005 smaller than the silver balls The black and silver balls must be installed alternately into the rack piston and return guide Alternately install 7 balls into the return guide and retain with grease at each end of guide Install the return guide clamp and tighten the 2 clamp screws to 6 ft Ibs 3F 18 1975 BUICK SERVICE v Www T ea m Ridl GK GOE seats using petrolatum to hold INSTALL BALLS WHILE ROTATING WORM COUNTER CLOCKWISE 5B3F22 Figure 3F 22 Loading Balls in Rack Piston Nut STEERING GEAR HOSE CONNECTOR AND POPPET CHECK VALVE Disassembly The following procedure can be performed on car as well as on bench 1 Disconnect pressure and return line hoses at steering gear and secure hose ends in a raised position to prevent loss of fluid 2 To prevent metal chips from becoming lodged in valve assembly pack inside of connector seats of pressure and return port housing with petrolatum 3 Tap threads in connector seats using a 5 16 18 tap Do not tap threads too deep in pressure hose connector seat as tap will bottom poppet valve against housing and damage it It is necessary to tap only 2 or 3 threads deep 4 Thread a 5 16 18 bolt with a nut and flat washer into tapped hole 5 To pull connector seat hold bolt from rotating while turning nut off bo
39. lt This will pull connector from hous ing Discard connector seat It is also possible to remove connector by using No 4 screw extractor easy out 6 Wipe petrolatum from housing and clean housing thoroughly to remove any metal chips or dirt 7 Remove poppet check valve and spring from pressure port and discard Assembly 1 Install new check valve spring in pressure port with large end down Make sure spring is seated in counterbore in pressure port 2 Intall new check valve over spring with tangs pointing down Make sure valve is centered on small end of spring connector seat on check valve in pressure port Drive connector seats in place using Valve Connector Seat In staller J 6217 4 Check operation of valve by pushing lightly against valve with a small punch or small rod Valve should reseat itself against connector seat when pressure is removed from spring 5 Connect pressure and return line hoses on steering gear Tighten hose fittings to specifications 6 Check fluid in pump reservoir and add if necessary PITMAN SHAFT NEEDLE BEARING AND SEALS Disassembly When prying out seals be extremely careful not to score the housing bore 1 If pitman shaft seals ONLY are to be replaced remove the seal retaining ring with Internal Pliers J 4245 and remove outer steel washer Using screw driver under lip of seal pry out the outer seal Remove the inner steel ven then pry out the inner seal Figure 3F 23 Dis
40. med CAUTION Avoid excessive torque as this can damage the bearing Figure 3F 32 Figure 3F 38 Rotating Torque Wir ich 23 gned 4 Rotate adjuster counter clockwise until hole is ali with second mark Figure 3F 37 in theadjuster GEAR AND PUMP 3 Measure back counterclockwise 3 16 to 1 4 and 2 Mark housing even with one o remark housing Figure 3F 36 plug Figure 3F 36 mol 99 4 ONINIV133 1V3S 110 S43HSVM ond 31snrav SIDVA ONI3V38 LSNYHL YINIVLIY NOISId 42 V 1V3S 43N34WYG 10045 ONIX O 51 35 4 2 ONIY O AQO8 3ATVA 1v3S ONIY O 15 Sivas 110 1 35 ONISNOH ONINIVI33 531035 00067 ONIY dVNS 000 000 532 000 0008 ONINV38 1S nuH1 A18W3SSV 14 5 9015 SONI AQO8 3A1VA 10045 IMYA 32 45 ONIY O 4 2 NOLSId VL JAN 194 2 STIv8 97 3dino Nuni33 dWV12 SYIHSVAHIOT 8 5 348425 ONISNOH 13 5 NVWLId 2 1 45 YaHSVM 3150 HSV1 AVIM LSNYHL l Yi 7 35 ONIY L3YSYO 3 8 ONIY O 1v3s 1sna A IAN 3201 SH3HSVAAMOO1 2 S1109 33AO2 3015 LAN Figure 3F 39 Exploded View Power Steering Gear 24 1975 BUICK SERVICE e ar
41. nd Nut Make Saginaw Gear Ratio Only SK e 16 0 1 B C E Series A Series 2 22 LL 15 0 1 Ratio Overall Including Linkage T 16 5 1 M PR NRBEM 18 9 1 Series Less Station Wagon LT 18 19 1 A Stati n Wagona aasma q e ana CEP d A Optional s c B Series 350 Engine C E Series Steering System Power Steering That Meets GM Specifications Number of Worm and Rack Piston Nut Balls DU Eu 12 Black 12 Plain Pump Specifications Pump Capacity Minimum Gal Min at 465 RPM Pump x 665 735 PSI A 1 25 Pump Capacity Maximum Gal Min at 150 RPM Pump x 50 PSI All Engines 2 80 Relief Valve Opening Pressure PSD L 6 and 350 Engine N abd 1350 1450 455 Engine 1350 1450 Pump Test Pressure Min PSI at 525 RPM Engine and 170 F Oil Temperature e 1000 Min www Team BURYERRIERRNG GEAR AND PUMP ak 29 NUT SHIELD SPRING STEERING COUPLING Z HOLD HEAD OF BOLT WHILE NUT 15 TORQUED STEERING COLUMN SHIELD STEERING COUPLING VERTICAL SHIELD 1509 APPROXIMATELY gt VIEW SHIELD DIRECTION ARROW A TO CENTER QF CAR WASHER ERONT OF CAR 5B3F47 Fig
42. ons aid 3F 17 Steering Gear Hose Connector and Poppet Check 3F 18 Pitman Shaft Needle Bearing and 5 3F 18 Reassembly of Power Steering Gear 3F 19 Adjustments of Power Steering Gear a treten tinis 3F 20 Removal and Installation of Oil Pump Shaft Seal with Pump Assembled 3F 24 Removal and Installation of Oil Pump Flow Control Valve 3F 24 Removal and Installation of Power Steering Oil Pump 3F 24 Disassembly Inspection Reassembly of Power Steering Oil 3F 25 SPECIFICATIONS Tightening Specification se ce ie kat ta oktob ekta kak beide aba pan ler urs 3F 28 Gear Specifications L ee eras ent DO T rcu 3F 28 PAN Specifications a ap tk de 3F 28 DESCRIPTION AND OPERATION DESCRIPTION OF POWER STEERING GEAR The major internal components of the variable ratio steer ing gear are the rotary valve assembly steering worm rack piston assembly and the pitman shaft Figure 3F 1 The movement of these parts while turning or parking is aided by hydraulic pr
43. ored pressure plate 4 Replace parts if rotor replace thrust plate or rotor with rotating group kit Flush system 5 Vanes not installed 5 Install properly properly 6 Vanes sticking in rotor 6 Free up by removing burrs Slots varnish or dirt www l eamBurowee ST RING GEAR AND PUMP 11 Condition Possible Cause Correction 7 Cracked or broken thrust or pressure plate 7 Replace part Low pressure due to steering gear 1 Pressure loss in cylinder due to worn piston ring or scored housing bore 1 Remove gear from car for dis assembly and inspection of ring and housing bore 2 Leakage at valve rings valve body to worm seal 2 Remove gear from car for disas sembly and replace seals Condition Test or Inspection Air in system Power steering fluid in the pump will be foamy and an abnormal noise will also result Bleed the sys tem by operating steering If the bleeding fails check for external leaks at the hoses and other connections and adjust as necessary Pump belt loose worn or Either adjust the pump belt tension replace the slipping belt or dress the belt with an appropriate lubricant Low oil level in pump Will result in excessive pump noise Check the level and fill as needed Check all connections for leakage and adjust as needed Incorrect steering gear adjustments Remove gear and make adjustments as outlined in the Major Repair
44. oval 1 Disconnect the pressure line from the pump 2 Unscrew the pressure union and carefully remove it The control valve is spring loaded and located behind the union assembly See Figure 3F 4 3 Remove the flow control valve and spring 4 Clean and inspect for damage burrs dirt or scoring 5 If damaged replace the flow control valve INSTALLATION 1 Place the spring and flow control valve in the orifice 2 Position the pressure union and torque to specifications Es Reinstall the pressure hose and torque to specifica ions REMOVAL AND INSTALLATION OF POWER STEERING OIL PUMP ASSEMBLY Pump Pulley Removal and installation The pump pulley is pressed on and can be removed with Tool J 25034 and installed with Tool J 25033 The Do s and Dont s of the pressed on pulley are DO S 1 Use care to prevent nicks on pump and pulley shaft and hubs 2 Be certain pulley hub is fully engaged in tool head 3 Use care to align tool with shaft thread 4 Install pulley until tool bottoms against shaft shoulder 5 Grip pump shaft with padded jaw pliers only 6 Make sure pulley hub is flush with shaft after remov ing tool DONT S 1 Don t clamp any parts of pump in vise 2 Don t put loads on pump reservoir 3 Don t spin pump shaft with power tools 4 Don t use steel jawed pliers to prevent shaft from turning 5 Don t side load the tool when installing pulley 6 Don t hammer non seated pulley Removal All
45. repair Due to the closeness of the various seals the wrong diagnosis will result in an ineffective repair HIGH OIL LEVEL OR CAP LEAKING RESERVOIR O RING DRIVE SHAFT SEAL HOSE FITTING OR O RING SEALS 3F 13 Figure 3F 5 Pump Leaks 4 1975 BUICK SERVICE MANJMW eamBuick com SIDE COVER O RING SEAL HOSE FITTINGS ROTORY VALVE ASSEMBLY OR SNUB SHAFT SEAL END PLUG O RING SEAL T PITMAN SHAFT 3F 14 SEALS Figure 3F 6 Steering Gear Leaks REPLACE ADJUSTER PLUG RING SEAL REPLACE DUST AND STUB SHAFT SEALS REPLACE ROTARY VALVE ASSEMBLY SEAT BALL FLUSH WITH PUNCH AND RESTAKE IF SEEPAGE PERSISTS REPLACE HOUSING Figure 3F 7 Upper End Steering Gear Leaks TROUBLE DIAGNOSIS This paragraph covers only those causes of trouble which may be due to the hydraulic power mechanism Causes which are due to the steering linkage and front suspension are the same as described for standard steering gear Condition Hissing noise in steering gear Rattle or Chuckle noise in steering gear Possible Cause 1 There is some noise in all power steering sys tems One of the most com mon 5 a hissing sound most evident at standstill parking There is no relationship between this noise and performance of the steer ing Hiss may be ex pected when steering wheel is at end of travel or when slowly turning at standstill
46. s I varnish or dirt Switch noise in steering 1 Malfunctioning flow 1 Replace part pump valve Whine noise in steering 1 Pump shaft bearing 1 Replace housing and shaft pump Flush system Poor return of steering 1 Lack of lubrication in 1 Lube linkage and ball joints wheel to center linkage and ball joints 2 Lower coupling flange 2 Loosen pinch bolt and assembly rubbing against steer properly ing gear adjuster plug 3 Steering gear to column 3 Align steering column misalignment 4 Tires not properly 4 Inflate to specified pressure inflated 5 Improper front wheel 5 Check and adjust as necessary alignment With front wheels still on align ment pads of front end machine dis connect pitman arm of linkage from pitman shaft of gear Turn front wheels by hand If wheels will not turn or turn with consider able effort determine if linkage or ball joints are binding WWW CAMBUKeWERGTEERING GEAR AND PUMP 7 l r JE Condition Possible Cause Correction 6 Steering linkage 6 Replace pivots binding 7 Ball joints binding 7 Replace ball joints Turn steering wheel and listen for internal rub bing in column check causes listed and correct as directed M X 8 Steering wheel rubbing 8 Adjust steering jacket against directional signal housing 9
47. section Gear loose on frame Visual observation of the gear will substantiate the condition Attach the gear to the frame prop erly and torque as specified Steering gear to column misaligned Observe action between the shaft and the gear If misaligned adjust column to align Unbalanced steering gear Steering effort will be very light in direction of valve leakage and heavy in the opposite direction Remove the rotary valve Sticky slow control valve Jerky operation or lack of assist Remove the valve from the pump as outlined in Major Repair section and inspect for damage or varnish Clean or replace as necessary Low pressure due to gear or pump Usually results in an overhaul condition Power steering system test procedure MAINTENANCE AND ADJUSTMENTS POWER STEERING OIL PUMP BELT ADJUSTMENT 1 Loosen the pump to bracket adjusting bolts and or nuts See Figures at the end of this section Also loosen any bolts that involve the A I R if equipped 2 Refer to the art at the end of this section for the engine and pump combination being worked on for the access point to apply pressure Tighten the belt 3 Tighten all bolts and or nuts to specifications 4 Belt tension should be as specified in Section 6B 12 1975 BUICK SERVICE MANDAL A Nabih 16 for the retaining ring Install MAJOR REPAIR REMOVAL AND INSTALLATION OF PITMAN SHAFT SEALS GEAR IN CAR Removal If upon inspection of
48. stall the inner single lip seal first then a back up washer Drive seal in far enough to provide clearance for the other seal back up washer and retaining ring Make sure that the inner seal does not bottom on the counterbore Install the outer double lip seal and the second back up washer in only far retaining ring 2 Fill pump reservoir to proper level Start engine and allow engine to idle for at least three minutes without turning steering wheel Turn wheel to left and check for leaks Adjust level if necessary 3 Remove tape and reconnect pitman arm Tighten pit man arm retaining nut to specifications CAUTION This pitman arm to steering gear fastener is an important attaching part in that it could affect the performance of vital compo nents and systems and or could result in major repair expense It must be replaced with one of the same part number or with an equivalent part if replacement becomes necessary Do not use a replacement part of lesser quality or sub stitute design Torque values must be used as specified during reassembly to assure proper retention of this part REMOVAL AND INSTALLATION OF POWER STEERING GEAR ASSEMBLY Removal 1 Place fender cover over left fender 2 Remove the steering coupling shield 3 Clean the hose connecting area of the gear to prevent dirt from entering the gear 4 Disconnect the pressure and return line hoses at the steering gear and elevate ends of hoses higher
49. than pump to prevent oil from draining out of pump 5 Remove pinch bolt securing lower steering column flex ible coupling flange to steering gear stub shaft 6 Remove pitman arm nut then remove the pitman arm using puller J 5504 See Figure 3F 8 7 Loosen the three frame to steering gear bolts at outside of frame and remove steering gear Installation CAUTION Fasteners in step 1 are important attaching parts in that they could affect the performance of vital components and systems and or could result in major repair expense They must be replaced with one of the same part number or with an equivalent part if re placement becomes necessary Do not use a re placement part of lesser quality or substitute design Torque values must be used as specified during reassembly to assure proper retention of these parts 1 Install the gear assembly by reversing the procedure for removal Torque pitman nut to specifications Torque flexible coupling pinch bolt to specifications Power steering hoses should be installed to maintain a minimum clearance of 1 between hoses and 1 2 to sur rounding parts Figures are at the end of this section 2 Fill pump reservoir to correct level with Buick Power Steering oil or equivalent 3 Start engine and maintain oil level in reservoir while allowing engine to idle for at Www GEAR AND PUMP 13 turning steering wheel Then rotate steering wheel through its
50. ure 3F 47 H Series Steering Gear Mounting and Coupling Shield WATER PULLEY MUST BE PRESSED ON FLUSH WITH END OF PUMP SHAFT BRACKET A SUPPORT p BOLT REAR lt gt 30 40 LB FT WASHER 5B3F48 Figure 3F 48 H Series Power Steering Pump Mounting 30 1975 BUICK SERVICE MANUAL camBuick com 50 MINIMUM CLEARANCE IN ALL DIRECTIONS AT THIS LOCATION f HOSE VIEW A RETURN B DO NOT BEND OR DISTORT PIPES TO FACILITATE INSTALLATION AFTER TIGHTENING NUT PIPES TO BE AGAINST GEAR AS SHOWN AT X HOSES MUST BE INSTALLED TO CLEAR EACH OTHER VIEW A AND ALL SURROUNDING PARTS MINIMUM CLEARANCE 50 RETURN HOSE MUST NOT BE TWISTED DURING INSTALLATION HOSE ENDS MUST BE KEPT FREE FROM DIRT amp OTHER CONTAMINATES FOR LEAK REPAIR IT IS PERMISSIBLE TO TORQUE FITTINGS A MAXIMUM OF 40 LB FT VIEW B 583F49 CLAMP SHIELD STEERING SHIELD STEERING COUPLING UPPER E CLAMP 15 20 LB FT SHIELD STEERING 219997016 LOWER SHIELD STEERING gt COUPLING LOWER ONT OF CAR VIEW A FR POSITION SHIELDS AROUND STEERING GEAR AND SECURE STEERING TABS IN PLACE GEAR WASHER FRONT OF CAR c0 60 5B3F50 Figure 50 X Series Steering Gear Mounting and Shield www CAMBUPROWER ST BRING GEAR AND PUMP 31 Z REPLACES THERMOSTAT HOUSING BOLT FRONT OF CAR
51. ust plate properly on dowel pins 6 Install pump ring on dowel pins with the arrow toward rear of housing 7 Install all ten vanes in rotor slots with rounded edge of vanes outward Vanes should slide freely 8 Lubricate pressure plate with Power Steering Fluid so as not to damage pressure plate O ring 9 Install pressure plate on dowel pins with circular depression for spring toward rear of housing Pressure plate must be pressed about 1 16 inch over the O ring to seat 10 Lubricate new end plate O ring with Power Steering Fluid and install in second groove from rear of housing 11 Install end plate spring in groove provided in pressure plate 12 Lubricate end plate with Power Steering Fluid so as not to damage O ring and press into housing Figure 45 Depress only far enough to enable retaining ring to seat properly in groove WOOD ROD PRESSURE PLATE END PLATE O RING SEAL Figure 3F 45 Seating Pressure Plate 13 Insatll end plate retaining ring and release arbor press 14 Place flow control valve spring in hole first and then insert flow contro valve with screened end toward front of housing 15 Install new stud seals and union seals in counter sunk holes and lubricate with Power Steering Fluid and install new reservoir O ring on housing 16 Lubricate inside edge of reservoir with Power Steering Fluid and install on housing being careful to align holes at the same time
52. wer thrust bearing and race re mained in the gear housing remove them at this time DISASSEMBLY INSPECTION AND REASSEMBLY OF INDIVIDUAL UNITS ADJUSTER PLUG Disassembly 1 If the oil seal ONLY is to be replaced and not the bearing install the adjuster plug loosely in the gear hous ing Remove the retaining ring with Internal Pliers J 4245 With a screw driver pry the dust seal and oil seal from the STUB SHAFT DUST SEAL STUB SHAFT SEAL 3F 23 Figure 3F 13 Removing Retaining Ring needle bearing bore Discard the oil seal 2 If the thrust bearing ONLY is to be removed pry the thrust bearing retainer at the two raised areas with a small screw driver Figure 3F 12 Remove the spacer thrust bearing washer thrust bearing and washer 3 If the needle bearing is to be replaced remove the retain ing ring using Internal Pliers J 4245 Figure 3F 13 Remove thrust bearings as outlined in step 2 above Drive needle bearing dust seal and oil seal from adjuster plug using Tool J 6221 ADJUSTER PLUG 3F 24 Figure 3F 14 Removing Needle Bearing 4 Wash all parts in clean solvent and dry parts with compressed air 5 Inspect thrust bearing spacer for wear or cracks Re place if damaged 6 Inspect thrust bearing rollers and thrust washers for wear pitting or scoring If any of these conditions exist replace the bearing and washers Assembly 1 If the needle bearing was removed place new needle
53. www eamB ukF6oWERBGfEERING GEAR AND PUMP 1 POWER STEERING GEAR AND PUMP CONTENTS DESCRIPTION AND OPERATION Description of Power Steering Gear scssecssessssssssssssesssssssssssesssssessesscsesscssessesateaeesecnecsestessecane 3F 1 Description of Power Steering Oil 1 DIAGNOSIS External Leak 2 Trouble Diagnosis aaa an aa auqa hai dd te Da 3F 5 MAINTENANCE AND ADJUSTMENTS Power Steering Oil Pump Belt Adjustment 3F 11 MAJOR REPAIR Removal and Installation of Pitman Shaft Seals Gear in 3F 12 Removal and Installation of Power Steering Gear 3F 12 Disassembly of Power Steering Gear 13 Disassembly Inspection and Reassembly of Individual Units aa ot kuka Q 3F 14 and Stub SHALE akt pave S o Costes den Deo brief Non 3F 15 Pitman Shaft and Side Cover 3F 17 PASYON ana le e a a eM as a et e Rend
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