Home ReviewsRefund
Home/Buick/LaCrosse/Buick LaCrosse I (2004-2009)/Repair manual/Manual & Power Steering/Power Steering System
Contents Wiring diagrams Section: Manual & Power Steering All sections

Power Steering System Buick LaCrosse I

Manual & Power Steering 14 illustrations ~7596 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Inner Tie Rod100 N.m74 lb ft
O-Ring Union Fitting75 N.m55 lb ft
Outer Tie Rod End Nut *30 N.m + 120°22 lb ft + 120°
Power Steering Cooler Pipe/Hose Mounting Bolt10 N.m89 lb in
Power Steering Gear Cylinder Line Fittings17 N.m13 lb ft
Power Steering Gear Mounting Bolts90 N.m66 lb ft
Power Steering Pipe Fittings (3.8L)27 N.m20 lb ft
Power Steering Pipes at Steering Gear (3.6L)27 N.m20 lb ft
Power Steering Pressure Hose Retainer Bolt (3.6L)9 N.m80 lb in
Power Steering Pressure Hose to Pump (3.6L)40 N.m30 lb ft
Power Steering Pressure Hose to Pump (3.8L)27 N.m20 lb ft
Power Steering Pump Bracket to Engine Mounting Bolts (3.6L)50 N.m37 lb ft
Power Steering Pump Flow Control Valve Union Fitting75 N.m55 lb ft
Power Steering Pump Mounting Bolts (3.8L)25 N.m18 lb ft
Power Steering Pump to Bracket Mounting Bolts (3.6L)22 N.m16 lb ft
Power Steering Remote Reservoir Bracket Bolt, Lower M8 (3.6L)25 N.m18 lb ft
Power Steering Remote Reservoir Bracket Bolts, Upper M6 (3.6L)9 N.m80 lb in
Power Steering Remote Reservoir to Reservoir Bracket Screws (3.6L)6 N.m53 lb in
Rack Bearing Preload Lock Nut68 N.m50 lb ft
Tie Rod End Jam Nut70 N.m52 lb ft
* Visually inspect to ensure that 21/2 - 41/2 threads are visible past the nylon washer.

Fastener Tightening Specifications

Power Steering Pump Specifications

VehicleEngine CodeEngine SizeHigh FlowPressure Relief
LPMGPMKPaPsi
W BuickL263.8L9.1/10.62.4/2.896501400
LY73.6L15.84.296501400

Power Steering Pump Specifications

Scheme 1

Scheme 1: Power Steering Gear Disassembled View (Rack and Pinion)
Scheme 1: Power Steering Gear Disassembled View (Rack and Pinion)
CalloutComponent Name
1Hexagon Torque Prevailing Nut
2Tie Rod Seal
3Outer Tie Road Assembly
4Hexagon Jam Nut
5Tie Rod End Clamp
6Rack and Pinion Boot
7Boot Clamp
8Inner Tie Rod Assembly
9Shock Dampener Ring
10Adjuster Plug Lock Nut
11Cylinder Line Assembly (RH)
12Cylinder Line Assembly (LH)
13O-Ring Seal
14O-Ring Seal
15Rack and Pinion Gear Assembly (Partial)
16Needle Bearing Annulus Assembly
17Seal Adapter
18Retaining Ring
19Spool Shaft Seal
20Hexagon Lock Nut
21Dust Cover
22Shock Dampener Ring
23Inner Tie Rod Assembly
24Breather Tube
25Boot Clamp
26Rack and Pinion Boot
27Tie Rod End Clamp
28Hexagon Jam Nut
29Outer Tie Rod Assembly
30Tie Rod Seal
31Hexagon Torque Prevailing Nut

Scheme 2

Scheme 2: Power Steering Pump Disassembled View (CB Series Pump)
Scheme 2: Power Steering Pump Disassembled View (CB Series Pump)
CalloutComponent Name
1Hydraulic Pump Reservoir Assembly (Typical)
2Reservoir Capstick Assembly
3O-Ring Seal
4Flow Control Spring
5Control Valve Assembly
6O-Ring Seal
7O-Ring Union Fitting
8Hydraulic Pump Housing Assembly
9Reservoir Retaining Clip (RH)
10Reservoir Retaining Clip (LH)

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Power Steering System in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Visual/Physical Inspection

  1. Review the system description and operation in order to familiarize yourself with the system functions. Refer to «Power Steering System Description and Operation (w/o Electro-Hydraulic Steering)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Inspect for aftermarket devices which could affect the operation of the power steering system.
  3. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  4. Inspect the power steering reservoir for the proper power steering fluid level and condition.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks)
  2. «Rattle, Clunk, or Shudder Noise from the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system)
  3. «Whine or Growl Noise from the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system)
  4. «Steering Effort Hard in One or Both Directions»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__steering-effort-hard-in-one-or)
  5. «Steering Effort Too Easy in One or Both Directions»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__steering-effort-too-easy-in-one)

Scheme 3

Scheme 3: Power Steering System Test Procedure
Scheme 3: Power Steering System Test Procedure
CalloutComponent Name
1Power Steering Return Hose
2Power Steering Pressure Hose

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 5: This step tests the system for restrictions.
  2. 7: This step tests the following components for the following conditions: The pump for internal leaks The power steering pipes for kinks
  3. 8: This step tests the ability of the pump to regulate flow at maximum pressure.
  4. 10: This step tests the ability of the pump to regulate flow under normal operating conditions.
  5. 12: This step tests the internal components of the pump and the gear.
StepActionValue(s)YesNo
DEFINITION: The Power Steering System Test Procedure will perform the following functions: Test the operation of the hydraulic power steering system. Test the operation of the power steering pump and power steering gear. Identify restrictions in the system.
1Inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Debris in fluid - plastic or dirt Is the fluid free of contamination?Go to Step 3Go to Step 2
2Flush the power steering system. Refer to Flushing the Power Steering System . Did you complete the procedure?Go to Step 3
3IMPORTANT: In order to accurately diagnose the system, the malfunction must be present during the test procedure. Attempt to duplicate the condition.Is the condition present?Go to Step 4System OK
4Turn the ignition switch to the OFF position. Place a drain pan under the vehicle in order to catch any power steering fluid. Disconnect the power steering pressure pipe/hose from the power steering pump or the power steering gear as necessary. Install the J 44721 Power Steering System Analyzer. See Special Tools . Fill the power steering system. Refer to Checking and Adding Power Steering Fluid . Did you complete the installation?Go to Step 5
5Fully open the J 44721 valve. See Special Tools . Start the engine. NOTE: Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices. Turn the steering wheel and BRIEFLY hold the steering wheel against the steering stop in order to release any trapped air from the system. Inspect and ensure that all of the power steering pipe/hose connections are not leaking. Making sure the steering wheel is OFF the steering stop, observe the pressure reading. Is the pressure reading greater than the specified value?1379 kPa (200 psi)Go to Step 6Go to Step 7
6IMPORTANT: A restriction may be present in the power steering system. Turn off the engine IMMEDIATELY. Locate and repair the restriction.Did you complete the repair?Go to Step 18
7Allow the engine to run until the engine reaches full operating temperature. Record the pressure reading and flow reading. Partially close the J 44721 valve until the system pressure reaches the specified value, then record the FLOW reading. See Special Tools . Subtract second flow reading from the first flow reading. Is the flow DECREASE greater than 3.8 L (1 gal) per minute?4827 kPa (700 psi)Go to Step 13Go to Step 8
8NOTE: Do not leave the valve fully closed for more than 5 seconds, or the pump could be damaged internally. Fully close then open the J 44721 valve 3 times. See Special Tools . Record all of the high pressure readings. Refer to Power Steering Pump Specifications for power steering system pressure relief specifications.Are the three high pressure readings within specifications?Go to Step 9Go to Step 15
9Are the three high pressure readings within 245 kPa (50 psi) of each other?Go to Step 10Go to Step 14
10Increase the engine speed to approximately 1500 RPM. Record the flow reading. Refer to Power Steering Pump Specifications for power steering system pressure specifications. Is the actual flow reading within specifications?Go to Step 11Go to Step 13
11Is the difference between the actual flow reading and the maximum flow specification more than 3.8 L (1 gal) per minute?Go to Step 16Go to Step 12
12NOTE: Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices. Turn the steering wheel from steering stop to steering stop and record the FLOW readings at each stop.Is the flow LOWER than 3.8 L (1 gal) per minute?Go to Step 18Go to Step 17
13Replace the power steering pump. Refer to Power Steering Pump Replacement (3.8L V6) or Power Steering Pump Replacement (LY7) . Did you complete the replacement?Go to Step 18
14Remove the power steering pump flow control valve. Refer to Power Steering Pump Flow Control Valve Replacement - Off Vehicle (CB Series) . Inspect the flow control valve. If any burrs or scratches are noticed on the flow control valve, replace the flow control valve. Do NOT attempt to clean the flow control valve. Refer to Power Steering Pump Flow Control Valve Replacement - Off Vehicle (CB Series) . Inspect the flow control valve bore. If any burrs or scratches are present in the control valve bore, replace the power steering pump. Refer to Power Steering Pump Replacement (3.8L V6) or Power Steering Pump Replacement (LY7) . Did you complete the repair?Go to Step 18
15Replace the power steering pump flow control valve. Refer to Power Steering Pump Flow Control Valve Replacement - Off Vehicle (CB Series) . Did you complete the replacement?Go to Step 18
16Remove the power steering pump flow control valve and inspect for any wear or damage. Do NOT disassemble the flow control valve. If the flow control valve is worn damaged, replace the flow control valve. Refer to Power Steering Pump Flow Control Valve Replacement - Off Vehicle (CB Series) . Did you complete the repair?Go to Step 18
17The power steering gear is leaking across the piston or bypassing the valve circuit. Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the replacement?Go to Step 18
18Test the power steering system for the original condition. Does the original condition still exist?Go to Step 5Go to Step 19
19Disconnect and remove the J 44721 from the vehicle. See Special Tools . Connect the vehicle power steering pipes/hoses. Bleed the power steering system and add fluid as necessary. Refer to Bleeding the Power Steering System . Did you complete the repair?System OK
IMPORTANT
In order to accurately diagnose the system, the malfunction must be present during the test procedure.
NOTE
Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices.
IMPORTANT
A restriction may be present in the power steering system. Turn off the engine IMMEDIATELY.
NOTE
Do not leave the valve fully closed for more than 5 seconds, or the pump could be damaged internally.
NOTE
Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices.

Power Steering System Test Procedure

Power Steering Fluid Leaks

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that power steering fluid leaks are present. Is the power steering system leaking?Go to Step 3System OK
3Inspect the power steering system fittings. Are the fittings leaking?Go to Step 8Go to Step 4
4Inspect the power steering hoses. Are the hoses leaking?Go to Step 9Go to Step 5
5Inspect the power steering sensors. Are the sensors leaking?Go to Step 10Go to Step 6
6Inspect the power steering pump and the reservoir for leaks. Is the power steering pump or reservoir leaking?Go to Step 11Go to Step 7
7Inspect the power steering gear for leaks. Is the power steering gear leaking?Go to Step 12Go to Step 8
8NOTE: Refer to Fastener Notice in Cautions and Notices. Tighten the fittings. Refer to Fastener Tightening Specifications .Did you complete the repair?Go to Step 13
9Replace the power steering hoses. Refer to the appropriate procedure(s): Power Steering Pressure Pipe/Hose Replacement (3.8L) Power Steering Return Hose Replacement (3.8L) Did you complete the repair?Go to Step 13
10Replace the power steering sensors. Did you complete the repair?Go to Step 13
11Replace the power steering pump or reservoir. Refer to Power Steering Pump Replacement (3.8L V6) , Power Steering Pump Replacement (LY7) or Power Steering Reservoir Replacement - Off Vehicle (CB Series) . Did you complete the repair?Go to Step 13
12Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 13
13Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3
NOTE
Refer to Fastener Notice in Cautions and Notices.

Power Steering Fluid Leaks

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that a rattle, clunk or shudder noise is present. Is a rattle, clunk or shudder noise present?Go to Step 3System OK
3Inspect the power steering hoses for proper routing and clearance. Is the routing or clearance of the power steering hoses incorrect?Go to Step 12Go to Step 4
4Inspect the engine drive belt for cracking or excessive wear. Refer to Drive Belt Excessive Wear Diagnosis in Engine Mechanical. Is the drive belt cracked or excessively worn?Go to Step 13Go to Step 5
5Inspect the power steering pump pulley for damage. Is the power steering pump pulley damaged?Go to Step 14Go to Step 6
6Inspect the power steering pump and the power steering mounting bracket/brace for the proper installation. Refer to Power Steering Pump Replacement (3.8L V6) or Power Steering Pump Replacement (LY7) . Is the power steering pump installation incorrect?Go to Step 15Go to Step 7
7Inspect the power steering gear for the proper installation. Refer to Power Steering Gear Replacement . Is the power steering gear installation incorrect?Go to Step 16Go to Step 8
8Inspect the steering gear bearing preload for the proper adjustment. Refer to Rack and Pinion Gear Rack Bearing Preload Adjustment - Off Vehicle (Magnasteer) . Did you find and correct the condition?Go to Step 20Go to Step 9
9Inspect for looseness in the inner and outer tie rod ends. Did you find looseness in the tie rod ends?Go to Step 17Go to Step 10
10Inspect the suspension. Is the suspension worn?Go to Step 18Go to Step 11
11Inspect the intermediate shaft. Is the intermediate shaft worn?Go to Step 19Go to Step 3
12Adjust or replace the hoses. Refer to the appropriate procedure(s): Power Steering Return Hose Replacement (3.8L) Power Steering Pressure Pipe/Hose Replacement (3.8L) Power Steering Return Hose Replacement (3.8L) Did you complete the repair?Go to Step 20
13Replace the engine drive belt. Refer to Drive Belt Replacement (L26) in Engine Mechanical. Did you complete the repair?Go to Step 20
14Replace the power steering pump pulley. Refer to Power Steering Pulley Replacement (LY7) or Power Steering Pulley Replacement (3.8L) . Did you complete the repair?Go to Step 20
15Install the power steering pump correctly. Refer to Power Steering Pump Replacement (3.8L V6) or Power Steering Pump Replacement (LY7) . Did you complete the repair?Go to Step 20
16Install the power steering gear correctly. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 20
17Replace the tie rod end. Refer to Rack and Pinion Inner Tie Rod Replacement . Did you complete the repair?Go to Step 20
18Replace the worn suspension components. Refer to Diagnostic Starting Point - Suspension General Diagnosis in Suspension General Diagnosis. Did you complete the repair?Go to Step 20
19Replace the intermediate shaft. Refer to Intermediate Steering Shaft Replacement in Steering Wheel and Column. Did you complete the repair?Go to Step 20
20Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Rattle, Clunk Or Shudder Noise From The Power Steering System

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that a whine or growl noise is present. Is a whine or growl noise present?Go to Step 3System OK
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Is there a hydraulic problem in the system?Go to Step 10Go to Step 4
4Inspect the power steering gear for a whine or growl noise. Is the noise present at the power steering gear?Go to Step 7Go to Step 5
5Inspect the power steering pump for a whine or growl noise. Is the noise present at the power steering pump?Go to Step 8Go to Step 6
6Inspect the power steering hoses for a whine or growl noise. Is the noise present at the power steering hoses?Go to Step 9Go to Step 3
7Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 10
8Replace the power steering pump. Refer to Power Steering Pump Replacement (3.8L V6) or Power Steering Pump Replacement (LY7) . Did you complete the repair?Go to Step 10
9Adjust the routing of the power steering hoses. Did you complete the repair?Go to Step 10
10Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Whine Or Growl Noise From The Power Steering System

Steering Effort Hard Or Too Easy In One Or Both Directions

StepActionYesNo
1Did you review the Power Steering System Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering effort is hard or too easy in one or both directions. Does the system operate normally?System OKGo to Step 3
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Did you complete the procedure?Go to Step 4
4Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Steering Effort Hard Or Too Easy In One Or Both Directions

Steering Effort Hard In One Or Both Directions

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering effort is hard in one or both directions. Does the system operate normally?System OKGo to Step 3
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Did you complete the procedure?Go to Step 4
4Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Steering Effort Hard In One Or Both Directions

Steering Effort Too Easy In One Or Both Directions

StepActionYesNo
1Did you review the Power Steering System Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering effort is too easy in one or both directions. Does the system operate normally?System OKGo to Step 3
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Did you complete the procedure?Go to Step 4
4Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Steering Effort Too Easy In One Or Both Directions

Tools Required

  1. J 35555 Mity Vac. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  2. J 43485 Power Steering Bleeder Adapter. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .

Bleeding Procedure

  1. Maintain the fluid level throughout the bleed procedure. Remove the pump reservoir cap. Fill the pump reservoir with fluid to the FULL COLD level.
  1. Attach J 43485 to J 35555 or equivalent. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  2. Place J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  3. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  4. Wait 5 minutes. Typical vacuum drop is 7-10 kPa (2-3 in Hg). If the vacuum does not remain steady, refer to «Excessive Vacuum Drop Diagnosis»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  5. Remove the J 43485 and the J 35555 . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  6. Reinstall the pump reservoir cap.
  7. Start the engine. Allow the engine to idle.
  8. Turn OFF the engine.
  9. Verify the fluid level. Repeat steps 8-10 until the fluid stabilizes.
  10. Start the engine. Allow the engine to idle.
  11. Turn the steering wheel 180-360 degrees in both directions 5 times.
  12. Turn OFF the ignition.
  13. Verify the fluid level.
  14. Remove the pump reservoir cap.
  15. Attach J 43485 to J 35555 or equivalent. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  16. Place J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  17. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  18. Wait 5 minutes.
  19. Remove J 43485 and J 35555 . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  20. Verify the fluid level.
  21. Reinstall the pump reservoir cap.
  1. J 35555 Mity Vac. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  2. J 43485 Power Steering Bleed Adapter. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .

Test Procedure

  1. If the vacuum continues to drop, remove the pressure hose and the return hose from the pump.
  2. Install the plugs (1,2) supplied with J 43485 into the pressure and the return port. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  3. Attach J 43485 to J 35555 or equivalent. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  4. Place J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  5. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  6. If the vacuum drops again, repair or replace the pump. If the vacuum holds steady, continue to check the other parts of the steering system.
  7. Observe the fluid.
  8. If the condition persists, replace the following parts: The return hose clamps The return hose O-rings The pressure hose O-rings The gear cylinder line O-rings The reservoir to pump O-ring
  9. Repeat the bleed procedure from the beginning.
  10. Drive the vehicle approximately 16 km (10 mi) in order to warm the system to operating temperature. Evaluate the vehicle on a smooth flat surface.
  11. Verify the following conditions: The power assist is smooth. The vehicle operates quietly. The pump maintains the proper fluid level. The steering system does not leak. The fluid is free of foam or discoloration.

Checking and Adding Power Steering Fluid

Note. When adding fluid or making a complete fluid change, always use the proper power steering fluid. Failure to use the proper fluid will cause hose and seal damage and fluid leaks.

  1. Clean the area surrounding the reservoir cap.
  2. Remove the reservoir cap.
  3. Inspect the power steering pump fluid level at regular intervals. Add fluid when required. Refer to «Fluid and Lubricant Recommendations»(/buick/lacrosse/i-2004-2009/remont/lubrication-system/#maintenance-and-lubrication__fluid-and-lubricant-recommendations) . If the fluid level is being checked cold, perform the following steps: Remove the reservoir cap. Inspect the fluid level on the dipstick. The fluid level should be between the bottom of the COLD/FULL mark and the end of the dipstick. If the fluid level is being checked hot, perform the following steps: Run the engine until the fluid reaches about 80°C (170°F). Turn OFF the engine. Remove the reservoir cap. Inspect the fluid level on the dipstick. The fluid level should be between the HOT/FULL and the COLD/FULL marks on the dipstick.
  4. If the fluid level is low, add the power steering fluid to the proper level.
  5. Install the reservoir cap.
  6. When you inspect the fluid level after servicing the steering system, bleed the air from the system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
IMPORTANTDo not reuse any drained power steering fluid regardless of appearance or condition.
  1. Turn off the engine.
  2. Raise the front end of the vehicle off the ground until the tires and wheels turn freely. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Place a large container under the fluid return hose in order to collect the draining fluid.
  4. Remove the fluid return hose at the power steering pump reservoir inlet connection.
  5. Plug the reservoir return hose inlet connection on the power steering pump.
  6. Run the engine at idle while an assistant maintains the fluid level at FULL COLD in the reservoir using new approved power steering fluid.
  7. Turn off the engine.
  8. Turn the steering wheel fully to the left and to the right.
  9. Remove the plug from the pump reservoir inlet connection.
  10. Install the fluid return hose to the pump reservoir.
  11. Maintain the fluid level at FULL COLD.
  12. Operate the engine at idle for approximately 15 minutes.
  13. Repeat steps 3-5.
  14. Inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Plastic debris or dirt chunks
  15. If the fluid is contaminated, repeat steps 6-12 in order to complete a third flush.
  16. Remove the plug from the pump reservoir inlet connection.
  17. Install the fluid return hose to the pump reservoir.
  18. Clean any spilled fluid.
  19. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system)

Removal Procedure

  1. Siphon the power steering fluid from the reservoir.
  2. Remove the coolant recovery reservoir. Refer to «Coolant Recovery Reservoir Replacement»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) .
  3. Disconnect the electrical harness clip at the underhood junction block and at the coolant reservoir.
  4. Disconnect the engine control module (ECM) wire harness from the ECM wire harness clip on the reservoir.
  5. Disconnect the power steering hoses from the power steering reservoir.
  6. Remove the power steering reservoir and bracket bolts and remove the reservoir and bracket assembly from the vehicle.
  7. Cap off the power steering reservoir and hoses to prevent contamination.

Installation Procedure

  1. Uncap the power steering reservoir and hoses.
  2. Install the power steering reservoir and bracket to the vehicle. Tighten: Tighten the M6 bolt to 9 N.m (7 lb ft). Tighten the M8 bolt to 25 N.m (18 lb ft).
  3. Connect the power steering reservoir hoses to the power steering reservoir.
  4. Install the coolant recovery reservoir. Refer to «Coolant Recovery Reservoir Replacement»(/buick/lacrosse/i-2004-2009/remont/cooling-system-mechanical/#engine-cooling-system) .
  5. Connect the ECM wire harness to the ECM wire harness clip on the reservoir.
  6. Connect the electrical harness clip at the underhood junction block and coolant reservoir.
  7. Fill the power steering reservoir with power steering fluid. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  8. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  9. Inspect the system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  1. J 25034-C Power Steering Pump Pulley Remover
  2. J 25034-257 Power Steering Pump Pulley Remover Adapter. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  1. Remove the power steering pump from the engine for clearance. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Use the J 25034-C and J 25034-257 in order to remove the pump pulley. See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  1. Use Mac® Tools Power Steering Pump Pulley Service Kit or equivalent, to install the power steering pump pulley.
  2. Install the power steering pump to the engine. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  1. J 25033-C Pulley Installer
  2. J 25034-C Pulley Remover
  1. Remove the power steering pump from the engine for clearance. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Using J 25034-C remove the power steering pump pulley from the power steering pump.
  1. Using J 25033-C install the power steering pump pulley to the power steering pump.
  2. Install the power steering pump to the engine. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  3. Fill the power steering system. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  4. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  5. Inspect the power steering system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  1. Remove the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  4. Disconnect the power steering pressure hose from the power steering pump. Refer to «Power Steering Pressure Pipe/Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  5. Disconnect the power steering return hose from the power steering pump. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  6. Disconnect the harness connector (4) from the power steering pump (1).
  7. Remove the power steering mounting bolts from the power steering pump.
  8. Remove the power steering pump from the engine.
  9. Remove the power steering pump pulley from the power steering pump. Refer to «Power Steering Pulley Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pulley Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  10. Remove the power steering pump reservoir from the power steering pump. Refer to «Power Steering Reservoir Replacement - Off Vehicle (CB Series)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  1. Install the power steering pump reservoir to the power steering pump. Refer to «Power Steering Reservoir Replacement - Off Vehicle (CB Series)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Install the power steering pump pulley to the power steering pump. Refer to «Power Steering Pulley Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pulley Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  3. Position the power steering pump to the engine.
  4. Install the power steering pump mounting bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  5. Connect the power steering pressure hose to the power steering pump. Refer to «Power Steering Pressure Pipe/Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  6. Connect the power steering return hose to the power steering pump. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  7. Install the harness connector (1) to the power steering pump (4).
  8. Install the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical - 3.8L.
  9. Fill the power steering system with fluid. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  10. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  11. Operate the power steering system and inspect for power steering system leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  1. Place a drain pan under the vehicle.
  2. Remove the drive belt. Refer to «Drive Belt Replacement»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5) in Engine Mechanical - 3.6L (LY7).
  3. Turn the steering wheel to the right in order to allow clearance to remove the pump.
  4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  5. Remove the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  6. Disconnect the power steering pump inlet hose from the power steering pump.
  7. Disconnect the power steering pressure hose from the power steering pump.
  8. Remove the power steering pump mounting bolts.
  9. Remove the power steering pump from the engine.
  10. Cap the power steering pump fittings and hoses to prevent contamination.
  11. Remove the power steering pump pulley. Refer to «Power Steering Pulley Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pulley Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  1. Install the power steering pump pulley. Refer to «Power Steering Pulley Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pulley Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Remove the caps from the power steering pump fittings and hoses.
  3. Position the power steering pump (1) on the engine.
  4. Install the power steering pump mounting bolts. HAND TIGHTEN ONLY.
  5. Tighten the mounting bolt (3). Tighten: Tighten the mounting bolt (3) to 50 N.m (37 lb ft).
  6. Tighten the rear power steering pump mounting bolt (2). Tighten: Tighten the rear power steering pump mounting bolt (2) to 50 N.m (37 lb ft).
  7. Connect the power steering pressure hose to the power steering pump. Tighten: Tighten the hose to 40 N.m (30 lb ft).
  8. Connect the power steering reservoir outlet hose to the power steering pump.
  9. Install the right front tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  10. Lower the vehicle.
  11. Install the drive belt. Refer to «Drive Belt Replacement»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-36l-ly7-repair-instructions-1-of-5) in Engine Mechanical - 3.6L (LY7).
  12. Remove the drain pan from under the vehicle.
  13. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  14. Inspect the system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .

Disassembly Procedure

  1. Place the hydraulic pump (1) on a fixed, flat surface, with the shaft facing upward.
  2. Insert a screwdriver into the retaining clip tab (3).
  3. Using the screwdriver, force the retaining clip tab (3) outward.
  4. Slide the reservoir clip (4) away from the hydraulic pump assembly (1).
  5. Repeat the above steps to remove the second reservoir clip (4).
  6. Remove the reservoir (2) from the hydraulic pump housing (1).
  7. Remove the O-ring seal from the neck of the reservoir (2) or inside the hydraulic pump housing (1). Discard the O-ring seal.

Assembly Procedure

  1. Lubricate the new O-ring seal with power steering fluid.
  2. Install the new O-ring seal onto the neck of the reservoir (2).
  3. Install the reservoir (2) onto the hydraulic pump assembly (1). Ensure the reservoir neck is completely engaged onto the hydraulic pump assembly (1).
  4. Align the feet of the reservoir with the sides of the hydraulic pump housing.
  5. Install the new reservoir retaining clips (4) (supplied with the pump). Ensure the retaining clip tabs (3) fully engage with the hydraulic pump housing (1).
  1. Remove the O-ring union fitting (5) from the hydraulic pump housing assembly (1).
  2. Remove the O-ring seal (4) from the O-ring union fitting (5).
  3. Remove the control valve assembly (3).
  4. Remove the flow control spring (2).
  1. Install the flow control spring (2) to the hydraulic pump housing assembly (1).
  2. Install the control valve assembly (3).
  3. Lubricate the O-ring seal (4) with power steering fluid.
  4. Install the O-ring seal (4) onto the O-ring union fitting (5).
  5. Install the O-ring union fitting (5) into the hydraulic pump housing assembly (1). Tighten: Tighten the fitting (5) to 75 N.m (55 lb ft).
  1. Remove the power steering pump from the vehicle, if necessary. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Use a small chisel in order to remove the seal. Discard the seal.
  1. Lubricate the new drive shaft seal using power steering fluid.
  2. Use a deep socket in order to install the new drive shaft seal.
  3. Install the power steering pump, if removed. Refer to «Power Steering Pump Replacement (3.8L V6)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .

J 24319-B Universal Steering Linkage Puller. See Special Tools .

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the prevailing torque nut (2) from the outer tie rod assembly (1).
  4. Loosen the jam nut (2) on the inner tie rod assembly (1).
  5. Remove the outer tie rod assembly from the steering knuckle using J 24319-B . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) .
  6. Remove the outer tie rod assembly (3) from the inner tie rod assembly (1).
  1. Install the outer tie rod assembly (3) to the inner tie rod assembly (1). Do NOT tighten the jam nut (2).
  2. Install the outer tie rod assembly (2) to the steering knuckle (1).
  3. Install the prevailing torque nut (2) to the outer tie rod assembly (1). Tighten: Tighten the nut to 30 N.m plus 120 degrees (34 lb ft plus 120 degrees). Inspect to ensure that 21/2-41/2 threads are visible above the nylon washer.
  4. Install tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  5. Lower the vehicle.
  6. Perform a front end alignment. Refer to «Measuring Wheel Alignment»(/buick/lacrosse/i-2004-2009/remont/wheel-alignment/#wheel-alignment-system__measuring-wheel-alignment) in Wheel Alignment.

J 22610 Keystone Clamp Pliers

  1. To remove the outer tie rod. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Remove the hexagon jam nut (2) from the inner tie rod assembly (1).
  3. Remove the tie rod end clamp (2) from the rack and pinion boot (1).
  4. Remove the boot clamp (1) from the rack and pinion boot with side cutters.
  5. Discard the boot clamp (1).
  6. Remove the rack and pinion boot (1) and the breather tube, if present, from the rack and pinion gear assembly.
  1. Install the new boot clamp (1) onto the rack and pinion boot (3).
  2. Prior to rack and pinion boot installation, apply grease to the inner tie rod assembly (2) and the rack and pinion gear assembly (1).
  3. Install the rack and pinion boot (3) onto the inner tie rod assembly (2).
  4. If present, install the breather tube while aligning the breather tube with the mark made during removal and the molded nipple of the rack and pinion boot.
  5. Install the rack and pinion boot onto the gear assembly (1) until the rack and pinion boot (3) is seated in the gear assembly groove.
  6. Install the boot clamp (1) on the rack and pinion boot (2) with J 22610 .
  7. Crimp the boot clamp (1).
  8. Pinch the pliers together on the rack and pinion boot (2) in order to install the tie rod end clamp.
  9. Install the tie rod end clamp (2) onto the rack and pinion boot (1).
  10. Install the hexagon jam nut (2) to the inner tie rod assembly (1).
  11. To assemble the outer tie rod assembly. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .

J 34028 Inner Tie Rod Wrench. See Special Tools .

  1. To remove the rack and pinion boot and the breather tube. Refer to «Rack and Pinion Boot Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Place the gear in a vise.
  3. Remove the shock dampener (4) from the inner tie rod housing (6).
  4. Slide the shock dampener (4) back on the rack (5). NOTE: Refer to «Pipe Wrench Positioning Notice»(/buick/lacrosse/i-2004-2009/remont/oem-general-information/#cautions-and-notices__pipe-wrench-positioning-notice) .
  5. Place a pipe wrench on the rack (5) next to the inner tie rod housing (6).
  6. Place a wrench on the flats of the inner tie rod housing (6).
  7. Rotate the inner tie rod housing (6) counterclockwise, while holding the rack stationary, until the inner tie rod separates from the rack (5).
  8. Remove the shock dampener (3) from the inner tie rod housing (2).
  9. Slide the shock dampener (3) back on the rack (5).
  10. Place a pipe wrench on the rack.
  11. Place a wrench on the flats of the inner tie rod housing (2).
  12. Rotate the inner tie rod housing (2) counterclockwise, while holding the rack stationary, until the inner tie rod (1) separates from the rack (5).
  13. If female rack (1) and male inner tie rod (3), remove the old LOCTITE® from the threads (2) of the inner tie rod and the rack. If male rack (5) and female inner tie rod (4) LOCTITE® will not be present.
  1. Slide the shock dampener (4) forward onto the rack (3).
  2. If female rack (3) and male inner tie rod (2), apply LOCTITE® 262, or equivalent, to the inner tie rod threads.
  3. Attach the inner tie rod onto the rack (3).
  4. Place a pipe wrench on the rack (3) next to the inner tie rod housing (2).
  5. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (2). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  6. Slide the shock dampener (2) forward onto the rack.
  7. If female rack and male inner tie rod (1), apply LOCTITE® 262, or equivalent, to the inner tie rod threads.
  8. Attach the inner tie rod (1) onto the rack.
  9. Place a pipe wrench on the rack next to the inner tie rod housing (4).
  10. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (7). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  11. Place the inner tie rod assembly (2) in a vise.
  12. Stake both sides of the female inner tie rod assembly housing to the male rack.
  13. Insert a 0.25 mm gage (1) between the rack (2) and the inner tie rod housing in order to check both stakes. The feeler gauge (1) must not pass between the rack and the housing stake.
  14. Slide the shock dampener (2) over the inner tie rod housing (3) until the front lip of the shock dampener (2) bottoms against the inner tie rod housing (3).
  15. To assemble the rack and pinion boot and the breather tube. Refer to «Rack and Pinion Boot Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .

J 22610 Keystone Clamp Pliers

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Remove the outer tie rod from the inner tie rod assembly. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  4. Remove the intermediate steering shaft lower pinch bolt. Refer to «Intermediate Steering Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  5. Remove the rear frame mounting bolts to allow for tool access. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  6. Remove the inner tie rod jam nut (2) from the inner tie rod assembly (1).
  7. Remove the clamp (2) from the end of the inner tie rod boot (1).
  8. Remove the inner tie rod boot clamp (1) from the inner tie rod boot (3) with side cutters.
  9. Discard the inner tie rod boot clamp (1).
  10. Remove the inner tie rod boot (3) and the breather tube (2).

Scheme 4

Scheme 4: Installation Procedure
Scheme 4: Installation Procedure
  1. Install the new inner tie rod boot clamp (1) onto the inner tie rod boot (3).
  2. Prior to the inner tie rod boot (3) installation, apply grease to the inner tie rod assembly (2) and the power steering gear assembly (1).
  3. Install the inner tie rod boot (3) onto the inner tie rod assembly (2).
  4. Align the breather tube with the mark made during removal and the molded nipple of the inner tie rod boot.
  5. Install the inner tie rod boot (3) onto the power steering gear assembly until the inner tie rod boot (3) is seated in the power steering gear assembly groove.
  6. Install the inner tie rod boot (3) onto the inner tie rod assembly (2).
  7. Using the J 22610 install the inner tie rod boot clamp (1) on the inner tie rod boot (2) by firmly crimping the inner tie rod boot clamp (1).
  8. Install the inner tie rod small boot clamp (2).
  9. Install the inner tie rod jam nut (2) to the inner tie rod assembly (1).
  10. Install the rear frame mounting bolts. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  11. Install the intermediate steering shaft lower pinch bolt. Refer to «Intermediate Steering Shaft Replacement»(/buick/lacrosse/i-2004-2009/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  12. Install the outer tie rod to the inner tie rod assembly. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  13. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  14. Lower the vehicle.
  15. Perform a front end alignment. Refer to «Measuring Wheel Alignment»(/buick/lacrosse/i-2004-2009/remont/wheel-alignment/#wheel-alignment-system__measuring-wheel-alignment) in Wheel Alignment.
  1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the return hose from the cooler pipe/hose. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  3. Remove the cooler pipe/hose retaining bolt from the frame.
  4. Remove the cooler pipe/hose from the retaining clips on the frame.
  5. Remove the cooler pipe/hose from the clamps on the steering gear.
  6. Remove the wiring harness clip from the cooler pipe/hose.
  7. Remove the cooler pipe/hose from the steering gear.
  8. Remove the cooler pipe/hose from the vehicle.
  1. Install the cooler pipe/hose to the vehicle.
  2. Install the cooler pipe/hose to the steering gear. Tighten: Tighten the fitting to 27 N.m (20 lb ft).
  3. Install the wiring harness clip to the cooler pipe/hose.
  4. Install the cooler pipe/hose to the clips on the steering gear.
  5. Install the cooler pipe/hose to the retaining clip on the frame.
  6. Install the cooler pipe/hose retaining bolt to the frame. Tighten: Tighten the bolt to 10 N.m (89 lb in).
  7. Install the return hose to the cooler pipe/hose. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  8. Lower the vehicle.
  9. Fill the power steering system. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  10. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  11. Inspect the power steering system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  1. Place a drain pan under the vehicle.
  2. Remove the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical-3.8L.
  3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  4. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  5. The power steering pressure hose is the lower hose at the power steering gear. Remove the power steering pressure hose from the power steering gear.
  6. Remove the power steering pressure hose from the power steering pump.
  7. Remove the power steering pressure hose from the clamps on the power steering gear.
  8. Remove the power steering pressure hose from the vehicle.

Scheme 5

Scheme 5: Installation Procedure
Scheme 5: Installation Procedure
  1. Install the power steering pressure hose to the vehicle.
  2. Install the power steering pressure hose to the clamps on the power steering gear.
  3. Install the power steering pressure hose to the power steering pump. Tighten: Tighten the fitting to 27 N.m (20 lb ft).
  4. Install the power steering pressure hose to the power steering gear. Tighten: Tighten the pressure hose fitting to 27 N.m (20 lb ft).
  5. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels
  6. Remove the drain pan from under the vehicle.
  7. Lower the vehicle.
  8. Install the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical-3.8L.
  9. Fill the power steering system with power steering fluid. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  10. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  11. Inspect the power steering system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  1. Remove the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical-3.8L.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  3. Place a drain pan under the vehicle in order to catch any draining power steering fluid.
  4. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  5. Remove the power steering return hose from the power steering gear.
  6. Remove the return hose from the power steering pump.
  7. Remove the return hose from the hose retainer.
  8. Remove the return hose from the vehicle.
  1. Install the return hose to the hose retainer.
  2. Install the return hose to the power steering pump.
  3. Install the return hose to the power steering gear. Tighten: Tighten the fitting to 27 N.m (20 lb ft).
  4. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  5. Remove the drain pan from under the vehicle.
  6. Lower the vehicle.
  7. Install the accessory drive belt. Refer to «Drive Belt Replacement (L26)»(/buick/lacrosse/i-2004-2009/remont/mechanical/#engine-mechanical-38l) in Engine Mechanical-3.8L.
  8. Fill the power steering fluid reservoir. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  9. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  10. Inspect the power steering system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .

J 42640 Steering Column Lock Pin

Scheme 6

Scheme 6: Removal Procedure
Scheme 6: Removal Procedure
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Place a drain pan under the vehicle.
  3. Remove the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  4. Remove the lower pinch bolt from the power steering gear stub shaft (2).
  5. Insert J 42640 into the steering column access hole in order to lock the steering column. This will maintain the correct orientation.
  6. Remove the intermediate steering shaft (1) from the power steering gear stub shaft (2).
  7. Remove both of the tie rod ends from the steering knuckles. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  8. Support the rear of the frame (3) using jackstands.
  9. Remove the frame bolts from the rear of the frame. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  10. Lower the rear of the frame (3).
  11. Remove the power steering pressure hose from the power steering gear. Refer to «Power Steering Pressure Pipe/Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  12. Remove the power steering return hose from the power steering gear. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  13. Remove the Magnasteer Variable Assist electrical connector from the power steering gear assembly, if equipped with variable effort steering.
  14. Remove the power steering gear mounting bolts and nuts (1, 4).
  15. Remove the power steering gear through the left wheel opening.
  1. Install the power steering gear through the left wheel opening.
  2. Install the power steering gear mounting bolts and nuts (1, 4). Tighten: Tighten the power steering gear mounting bolts to 90 N.m (66 lb ft).
  3. Inspect the threads on the power steering pressure hose and the power steering return hose.
  4. Inspect the O-ring seals on the power steering hoses.
  5. Replace the seals if damaged, lubricate the seals before installation.
  6. Install the clamp that holds the power steering hoses to the power steering gear.
  7. Install the Magnasteer Variable Assist electrical connector to the power steering gear assembly, if equipped with variable effort steering.
  8. Install the power steering pressure hose to the power steering gear. Refer to «Power Steering Pressure Pipe/Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  9. Install the power steering return hose to the power steering gear. Refer to «Power Steering Return Hose Replacement (3.8L)»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  10. Raise the frame into position (3).
  11. Install rear frame bolts. Refer to «Frame Replacement»(/buick/lacrosse/i-2004-2009/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
  12. Remove the jackstands.
  13. Install the tie rod ends to the steering knuckles. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  14. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/i-2004-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  15. Install the intermediate steering shaft (1) to the power steering gear stub shaft (2).
  16. Install the lower pinch bolt to the intermediate steering shaft at the power steering gear stub shaft. Tighten: Tighten the pinch bolt to 48 N.m (35 lb ft).
  17. Install the intermediate steering shaft seal onto the power steering gear.
  18. Install the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/i-2004-2009/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  19. Remove the drain pan from under the vehicle.
  20. Lower the vehicle.
  21. Remove the J 42640 from the steering column.
  22. Fill the power steering system with power steering fluid. Refer to «Checking and Adding Power Steering Fluid»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
  23. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  24. Inspect the power steering system for leaks. Refer to «Power Steering Fluid Leaks»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
  25. Preform a front end alignment. Refer to «Measuring Wheel Alignment»(/buick/lacrosse/i-2004-2009/remont/wheel-alignment/#wheel-alignment-system__measuring-wheel-alignment) in Wheel Alignment.

Rack and Pinion Gear Rack Bearing Preload Adjustment - Off Vehicle (Magnasteer)

  1. Loosen the adjuster plug lock nut (1).
  2. Turn the adjuster plug clockwise until the adjuster plug bottoms in the gear assembly.
  3. Turn the adjuster plug back 50 degrees to 70 degrees (approximately one flat).
  4. Install the adjuster plug lock nut (1) to the adjuster plug. Tighten: Hold the adjuster plug stationary while tightening the adjuster plug lock nut (1) to 68 N.m (50 lb ft).

J 22610 Keystone Clamp Pliers.

  1. To remove the outer tie rod. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Remove the hexagon jam nut (2) from the inner tie rod assembly (1).
  3. Remove the tie rod end clamp (2) from the rack and pinion boot (1).
  4. Remove the boot clamp (1) from the rack and pinion boot with side cutters.
  5. Discard the boot clamp (1).
  6. Remove the rack and pinion boot (1) and the breather tube, if present, from the rack and pinion gear assembly.
  1. Install the new boot clamp (1) onto the rack and pinion boot (3).
  2. Prior to rack and pinion boot installation, apply grease to the inner tie rod assembly (2) and the rack and pinion gear assembly (1).
  3. Install the rack and pinion boot (3) onto the inner tie rod assembly (2).
  4. If present, install the breather tube while aligning the breather tube with the mark made during removal and the molded nipple of the rack and pinion boot.
  5. Install the rack and pinion boot onto the gear assembly (1) until the rack and pinion boot (3) is seated in the gear assembly groove.
  6. Install the boot clamp (1) on the rack and pinion boot (2) with J 22610 .
  7. Crimp the boot clamp (1).
  8. Pinch the pliers together on the rack and pinion boot (2) in order to install the tie rod end clamp.
  9. Install the tie rod end clamp (2) onto the rack and pinion boot (1).
  10. Install the hexagon jam nut (2) to the inner tie rod assembly (1).
  11. To assemble the outer tie rod assembly. Refer to «Rack and Pinion Outer Tie Rod End Replacement»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .

J 34028 Inner Tie Rod Wrench. See Special Tools .

  1. To remove the rack and pinion boot, refer to «Rack and Pinion Boot and Breather Tube Replacement - Off Vehicle»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Place the gear in a vise.
  3. Remove the shock dampener (6) from the inner tie rod housing (4).
  4. Slide the shock dampener (6) back on the rack (5).
  5. Place a pipe wrench on the rack (5) next to the inner tie rod housing (4).
  6. Place a wrench on the flats of the inner tie rod housing (4).
  7. Rotate the inner tie rod housing (4) counterclockwise, while holding the rack stationary, until the inner tie rod separates from the rack (5).
  8. Remove the shock dampener (3) from the inner tie rod housing (2).
  9. Slide the shock dampener (3) back on the rack (5).
  10. Place a pipe wrench on the rack.
  11. Place a wrench on the flats of the inner tie rod housing (2).
  12. Rotate the inner tie rod housing (2) counterclockwise, while holding the rack stationary, until the inner tie rod (1) separates from the rack (5).
  13. If female rack (1) and male inner tie rod (3), remove the old LOCTITE® from the threads (2) of the inner tie rod (3) and the rack (1). If male rack (5) and female inner tie rod (4) LOCTITE® will not be present.
  1. Slide the shock dampener (4) forward onto the rack (3).
  2. If female rack (3) and male inner tie rod (2), apply LOCTITE® 262, or equivalent, to the inner tie rod threads.
  3. Attach the inner tie rod onto the rack (3).
  4. Place a pipe wrench on the rack (3) next to the inner tie rod housing (2).
  5. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (2). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  6. Slide the shock dampener (2) forward onto the rack.
  7. If female rack and male inner tie rod (1), apply LOCTITE® 262, or equivalent, to the inner tie rod threads.
  8. Attach the inner tie rod (1) onto the rack.
  9. Place a pipe wrench on the rack next to the inner tie rod housing (4).
  10. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (7). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  11. Place the inner tie rod assembly (2) in a vise.
  12. Stake both sides of the female inner tie rod assembly housing to the male rack (1).
  13. Insert a 0.25 mm gage (1) between the rack (2) and the inner tie rod housing in order to check both stakes. The feeler gage (1) must not pass between the rack and the housing stake.
  14. Slide the shock dampener (2) over the inner tie rod housing (3) until the front lip of the shock dampener (2) bottoms against the inner tie rod housing (3).
  15. To assemble the rack and pinion boot. Refer to «Rack and Pinion Boot and Breather Tube Replacement - Off Vehicle»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  1. Remove the rack and pinion boot. Refer to «Rack and Pinion Boot and Breather Tube Replacement - Off Vehicle»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  2. Place the gear in a vise.
  3. Remove the shock dampener (4) from the inner tie rod assembly (6).
  4. Slide the shock dampener (4) back on the rack (5).
  5. Place a pipe wrench on the rack (5) next to the inner tie rod housing (6).
  6. Place a wrench on the flats of the inner tie rod housing (6).
  7. Rotate the inner tie rod housing (6) counterclockwise, while holding the rack stationary, until the inner tie rod separates from the rack (5).
  8. Remove the shock dampener (3) from the inner tie rod housing (2).
  9. Slide the shock dampener (3) back on the rack (5).
  10. Place a pipe wrench on the rack.
  11. Place a wrench on the flats of the inner tie rod housing (2).
  12. Rotate the inner tie rod housing (2) counterclockwise, while holding the rack stationary, until the inner tie rod (1) separates from the rack (5).
  13. If female rack (1) and male inner tie rod (3), remove the old LOCTITE® from the threads (2) of the inner tie rod and the rack. If male rack (5) and female inner tie rod (4) LOCTITE® will not be present.
  1. Slide the shock dampener (4) forward onto the rack (3).
  2. If female rack (3) and male inner tie rod (2), apply LOCTITE® 262 or equivalent to the inner tie rod threads.
  3. Attach the inner tie rod onto the rack (3).
  4. Place a pipe wrench on the rack (3) next to the inner tie rod housing (2).
  5. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (2). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  6. Slide the shock dampener (2) forward onto the rack.
  7. If female rack and male inner tie rod (1), apply LOCTITE® 262 or equivalent to the inner tie rod threads.
  8. Attach the inner tie rod (1) onto the rack.
  9. Place a pipe wrench on the rack next to the inner tie rod housing (4).
  10. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (7). See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system__special-tools) . Tighten: Tighten the inner tie rod to 100 N.m (74 lb ft).
  11. Place the inner tie rod assembly (2) in a vise.
  12. Stake both sides of the female inner tie rod assembly housing to the male rack.
  13. Insert a 0.25 mm gage (1) between the rack (2) and the inner tie rod housing in order to check both stakes. The feeler gage (1) must not pass between the rack and the housing stake.
  14. Slide the shock dampener (2) over the inner tie rod housing (3) until the front lip of the shock dampener (2) bottoms against the inner tie rod housing (3).
  15. To assemble the rack and pinion boot. Refer to «Rack and Pinion Boot and Breather Tube Replacement - Off Vehicle»(/buick/lacrosse/i-2004-2009/remont/manual-power-steering/#power-steering-system) .
  1. Loosen both cylinder line fittings (1) on the cylinder end of the gear assembly.
  2. Loosen both fittings on the cylinder line assemblies (3) at the valve end of the gear assembly.
  3. Remove both cylinder line assemblies (1) from the rack and pinion gear assembly (2).
  4. Remove the O-ring seals (1) from the valve end of line.
  5. Discard the O-ring seals (1).
  1. Inspect the cylinder lines (1) for the following items: Cracks Dents Damage to the threads
  2. Replace the parts as needed.
  3. Install the new O-ring seals (1) to the valve end of the cylinder lines.
  4. Install the cylinder line assemblies (1) to the gear assembly (2). Tighten Tighten the valve end fittings to 17 N.m (13 lb ft). Tighten the cylinder end fittings to 27 N.m (20 lb ft).

The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The hydraulic power steering pumps are either belt-driven or direct-drive, cam-driven.

The power steering fluid reservoir holds the power steering fluid and may be integral with the power steering pump or remotely located. The following locations are typical locations for the remote reservoir

  1. Mounted to the front of the dash panel
  2. Mounted to the inner fender
  3. Mounted to a bracket on the engine

The 2 basic types of power steering gears are listed below

  1. A recirculating ball system
  2. A rack and pinion system

In the recirculating ball system, a worm gear converts steering wheel movement to movement of a sector shaft. A pitman arm attached to the bottom of the sector shaft actually moves one tie rod and an intermediate rod move the other tie rod.

In the rack and pinion system, the rack and the pinion are the 2 components that convert steering wheel rotation to lateral movement. The steering shaft is attached to the pinion in the steering gear. The pinion rotates with the steering wheel. Gear teeth on the pinion mesh with the gear teeth on the rack. The rotating pinion moves the rack from side to side. The lateral action of the rack pushes and pulls the tie rods in order to change the direction of the vehicle's front wheels.

The power steering pressure hose connects the power steering pump union fitting to the power steering gear and allows pressurized power steering fluid to flow from the pump to the gear.

The power steering return hose returns fluid from the power steering gear back to the power steering fluid reservoir. The power steering return line may contain an integral fin-type or line-type power steering fluid cooler.

In a typical power steering system, a pump generates hydraulic pressure, causing fluid to flow, via the pressure hose, to the steering gear valve assembly. The steering gear valve assembly regulates the incoming fluid to the right and left chambers in order to assist in right and left turns.

Turning the steering wheel activates the valve assembly, which applies greater fluid pressure and flow to 1 side of the steering gear piston and lower pressure/flow to the other side of the piston. The pressure assists the movement of the gear piston. Tie rods transfer this force to the front wheels, which turn the vehicle right or left.

Special Tools

Special Tools Illustration Tool Number/Description J 22610 Keystone Clamp Pliers J 24319-B Steering Linkage and Tie Rod Puller J 25033-C Pulley Installer J 25034-C Pulley Remover J25034-257 Power Steering Pump Pulley Remover Adapter J 34028 Inner Tie Rod Wrench J 35555 Metal Mityvac J 42640 Steering Column Anti-rotation Pin J 43485 Power Steering Bleeder Adapter J 44721 Power Steering Analyzer

Scheme 7

Scheme 7: Special Tools
Scheme 7: Special Tools

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14

See also:
• Drive Belt Excessive Wear Diagnosis
• Diagnostic Starting Point - Suspension General Diagnosis
• Intermediate Steering Shaft Replacement
• Fluid and Lubricant Recommendations
• Lifting and Jacking the Vehicle
• Coolant Recovery Reservoir Replacement
• Fastener Notice
• Tire and Wheel Removal and Installation
• Drive Belt Replacement
• Measuring Wheel Alignment
• Pipe Wrench Positioning Notice
• Frame Replacement
• Symptoms - Power Steering System
• Power Steering Fluid Leaks
• Steering Effort Hard in One or Both Directions
• Steering Effort Too Easy in One or Both Directions
• Special Tools
• Checking and Adding Power Steering Fluid
• Power Steering Pump Specifications
• Fastener Tightening Specifications
• Rack and Pinion Gear Rack Bearing Preload Adjustment - Off Vehicle (Magnasteer)