Home ReviewsRefund
Home/Buick/LeSabre/Buick LeSabre VIII (2000-2005)/Repair manual/Manual & Power Steering/Power Steering System
Contents Wiring diagrams Section: Manual & Power Steering All sections

Power Steering System Buick LeSabre VIII

Manual & Power Steering 26 illustrations ~7474 words

FASTENER TIGHTENING SPECIFICATIONS

ApplicationSpecification
MetricEnglish
Adjuster Plug Lock Nut68 N.m50 lb ft
Cylinder End Fittings27 N.m20 lb ft
Inner Tie Rod to Gear100 N.m74 lb ft
Intermediate Steering Shaft Pinch Bolt45 N.m33 lb ft
Outer Tie Rod End to Knuckle Nut
First Pass30 N.m22 lb ft
Second Pass+180 degrees
Power Steering Hose Fittings30 N.m22 lb ft
Power Steering Gear Heat Shield9 N.m80 lb in
Power Steering Pump Mounting Bolts25 N.m18 lb ft
Steering Gear Mounting Bolts95 N.m70 lb ft
Valve End Fittings17 N.m13 lb ft

Fastener Tightening Specifications

Scheme 1

Scheme 1: POWER STEERING PUMP SPECIFICATIONS
Scheme 1: POWER STEERING PUMP SPECIFICATIONS

Scheme 2

Scheme 2: POWER STEERING GEAR DISASSEMBLED VIEW (MAGNASTEER)
Scheme 2: POWER STEERING GEAR DISASSEMBLED VIEW (MAGNASTEER)

Scheme 3

Scheme 3: POWER STEERING GEAR DISASSEMBLED VIEW (RACK & PINION)
Scheme 3: POWER STEERING GEAR DISASSEMBLED VIEW (RACK & PINION)

Scheme 4

Scheme 4: POWER STEERING PUMP DISASSEMBLED VIEW (CB SERIES PUMP)
Scheme 4: POWER STEERING PUMP DISASSEMBLED VIEW (CB SERIES PUMP)

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.

Note. The following steps must be completed before using the symptom tables.

  1. Determine if the vehicle is equipped with an electrically assisted variable effort system. Perform electrical diagnosis before proceeding with mechanical diagnosis.
  2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to «POWER STEERING SYSTEM DESCRIPTION & OPERATION»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the power steering system.
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. 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/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system)
  2. «RATTLE, CLUNK, OR SHUDDER NOISE FROM POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system)
  3. «WHINE OR GROWL NOISE FROM POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system)
  4. «STEERING EFFORT HARD IN ONE OR BOTH DIRECTIONS»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system)
  5. «STEERING EFFORT TOO EASY IN ONE OR BOTH DIRECTIONS»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system)

Scheme 5

Scheme 5: POWER STEERING SYSTEM TEST PROCEDURE
Scheme 5: POWER STEERING SYSTEM TEST PROCEDURE

Test Description

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

  1. 3 This step tests the system for restrictions.
  2. 5 This step tests the following components for the following conditions: The pump for internal leaks. The power steering pipes for kinks.
  3. 6 This step tests the ability of the pump to regulate flow at maximum pressure.
  4. 8 This step tests the ability of the pump to regulate flow under normal operating conditions.
  5. 10 This step tests the internal components of the pump and the gear.

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9: POWER STEERING FLUID LEAKS
Scheme 9: POWER STEERING FLUID LEAKS

Scheme 10

Scheme 10: RATTLE, CLUNK, OR SHUDDER NOISE FROM POWER STEERING SYSTEM
Scheme 10: RATTLE, CLUNK, OR SHUDDER NOISE FROM POWER STEERING SYSTEM

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12: WHINE OR GROWL NOISE FROM POWER STEERING SYSTEM
Scheme 12: WHINE OR GROWL NOISE FROM POWER STEERING SYSTEM

Scheme 13

Scheme 13: STEERING EFFORT HARD IN ONE OR BOTH DIRECTIONS
Scheme 13: STEERING EFFORT HARD IN ONE OR BOTH DIRECTIONS

Scheme 14

Scheme 14: STEERING EFFORT TOO EASY IN ONE OR BOTH DIRECTIONS
Scheme 14: STEERING EFFORT TOO EASY IN ONE OR BOTH DIRECTIONS

Note. Tools Required: Metal Mityvac (J 35555) and Power Steering Bleeder Adapter (J 43485).

Note. Hoses touching the frame, body, or engine may cause system noise.

  1. Verify that the hoses do not touch any other part of the vehicle. NOTE: Loose connections may not leak, but could allow air into the steering system.
  2. Verify that all hose connections are tight. CAUTION: If the power steering system has been serviced, an accurate fluid level reading cannot be obtained unless air is bled from the steering system. The air in the fluid may cause pump cavitation noise and may cause pump damage over a period of time. NOTE: Maintain the fluid level throughout the bleed procedure.
  3. Remove the pump reservoir cap. NOTE: Use clean, new power steering fluid only.
  4. Fill the pump reservoir with fluid to the FULL COLD level.
  5. Attach the J 43485 to the J 35555 or equivalent.
  6. Place the J 43485 on or in the pump reservoir filler neck.
  7. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  8. Wait 5 minutes.
  9. Typical vacuum drop is 7-10 kPa (2-3 in Hg). If the vacuum does not remain steady, refer to Excessive Vacuum Drop Diagnosis at the end of this procedure.
  10. Remove the J 43485 and the J 35555.
  11. Reinstall the pump reservoir cap.
  12. Start the engine. Allow the engine to idle.
  13. Turn off the engine.
  14. Verify the fluid level. Repeat steps 11 - 13 until the fluid stabilizes. NOTE: Do not turn steering wheel to lock.
  15. Start the engine. Allow the engine to idle.
  16. Turn the steering wheel 180-360 degrees in both directions 5 times.
  17. Switch the ignition off. CAUTION: 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.
  18. Verify the fluid level.
  19. Remove the pump reservoir cap.
  20. Attach the J 43485 to the J 35555 or equivalent.
  21. Place the J 43485 on or in the pump reservoir filler neck.
  22. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  23. Wait 5 minutes.
  24. Remove the J 43485 and the J 35555.
  25. Verify the fluid level.
  26. Reinstall the pump reservoir cap.

Excessive Vacuum Drop Diagnosis

  1. If the vacuum continues to drop, remove the pressure and return hose from the pump.
  2. Install the plugs (1,2) supplied with the J 43485 into the pressure and return port.
  3. Attach the J 43485 to the J 35555 or equivalent.
  4. Place the J 43485 on or in the pump reservoir filler neck.
  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. NOTE: Fluid must be free from bubbles and foam. Be aware of periodic bubbles that indicate a loose connection or leaking O-ring seal in the return hose or the pressure hose. Fluid must be free from discoloration.
  7. Observe the fluid.
  8. If 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 vehicle on a smooth flat surface.
  11. Verify the following conditions: There is smooth power assist. The vehicle operates quietly. The pump maintains the proper fluid level. There is not any leaking in the steering system. The fluid is free of foam or discoloration.

CHECKING & ADDING POWER STEERING FLUID

CAUTIONWhen 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.

Scheme 15

Scheme 15
Scheme 15
  1. Clean the area surrounding the reservoir cap.
  2. Remove the reservoir cap.
  3. Inspect the power steering pump fluid level at regular intervals. Use the appropriate procedure below.
  4. Add fluid when required. Fluid Is Cold Remove the reservoir cap. Inspect the fluid level on the capstick. Ensure that the fluid level is between the bottom of the COLD/FULL mark and the end of the capstick. Fluid Is Hot Run the engine until the fluid reaches about 80°C (170°F). Turn the engine OFF. Remove the reservoir cap. Inspect the fluid level on the capstick. Ensure that the fluid level is between the HOT/FULL and the COLD/FULL marks on the capstick.
  5. If the fluid level is low, add power steering fluid to the proper level.
  6. Install the reservoir cap.
  7. When checking the fluid level after servicing the steering system, bleed the air from the system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .

Note. Do 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.
  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. NOTE: This step may require 4.0 L (4.22 qt) of power steering fluid until the draining fluid appears clear. Do not run the engine without the power steering fluid level at FULL COLD.
  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 POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .

Removal Procedure

  1. Raise and support the vehicle.
  2. Install a drain pan under the vehicle.
  3. Remove the power steering pressure hose from the flow control valve.
  4. Remove the flow control valve assembly (3) from the power steering pump.
  5. Remove the power steering flow control spring (2).

Installation Procedure

  1. Install the power steering flow control spring (2) to the power steering pump. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the power steering flow control valve assembly (3) to the power steering pump. Tighten the power steering flow control valve assembly (5) to 75 N.m (55 ft lbs).
  3. Install the power steering pressure hose to the power steering pump. Tighten the power steering pressure hose to 30 N.m (22 ft lbs).
  4. Lower the vehicle.
  5. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .

POWER STEERING PULLEY REPLACEMENT

Note. Tools Required: Pulley Remover (J 25034-C) and Pulley Installer (J 25033-C).

  1. Remove the drive belt(s). Refer to «DRIVE BELT REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/mechanical/#engine-mechanical-38l-on-vehicle) in Engine Mechanical - 3.8L.
  2. Remove the power steering pump. Refer to «POWER STEERING PUMP REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  3. Using J 25034-C remove the power steering pulley from the power steering pump.
  1. Using J 25033-C install the power steering pulley to the power steering pump.
  2. Ensure that the axial tolerance of the power steering pulley on the power steering pump is within 0.25 mm (0.010 in).
  3. Install the power steering pump to the engine. Refer to «POWER STEERING PUMP REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  4. Install the pump drive belt. Refer to «DRIVE BELT REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/mechanical/#engine-mechanical-38l-on-vehicle) in Engine Mechanical - 3.8L.
  5. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  6. Inspect the system for leaks.
  1. Remove the drive belt. Refer to «DRIVE BELT REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/mechanical/#engine-mechanical-38l-on-vehicle) in Engine Mechanical - 3.8 L.
  2. Raise and support the vehicle.
  3. Install a drain pan under the vehicle.
  4. Disconnect the power steering pressure hose from the power steering pump.
  5. Disconnect the power steering return hose from the power steering pump.
  6. Disconnect the wiring harness from the power steering pump.
  7. Lower the vehicle.
  8. Remove the coolant recovery reservoir. Refer to «COOLANT RECOVERY RESERVOIR REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/cooling-fan/#engine-cooling-system__coolant-recovery-reservoir-replacement) in Engine Cooling.
  9. Remove the power steering pump retaining bolts.
  10. Remove the power steering pump.
  11. Transfer the power steering pulley as needed. Refer to «POWER STEERING PULLEY REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__power-steering-pulley-replacement) .

Scheme 16

Scheme 16: Installation Procedure
Scheme 16: Installation Procedure
  1. Install the power steering pump to the engine. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the power steering pump retaining bolts. Tighten the power steering pump retaining bolts to 25 N.m (18 ft lbs).
  3. Install the coolant recovery reservoir. Refer to «COOLANT RECOVERY RESERVOIR REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/cooling-fan/#engine-cooling-system__coolant-recovery-reservoir-replacement) in Engine Cooling.
  4. Raise the vehicle.
  5. Connect the wiring harness to the power steering pump.
  6. Connect the power steering pressure hose to the power steering pump. Tighten the power steering pressure hose to 30 N.m (22 ft lbs).
  7. Connect the power steering return hose to the power steering pump.
  8. Lower the vehicle.
  9. Install the drive belt. Refer to «DRIVE BELT REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/mechanical/#engine-mechanical-38l-on-vehicle) in Engine Mechanical - 3.8 L.
  10. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  11. Inspect the power steering system for 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 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). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  5. Install the O-ring union fitting (5) into the hydraulic pump housing assembly (1). Tighten the fitting (5) to 75 N.m (55 ft lbs).

TIE ROD END REPLACEMENT - OUTER

Note. Tools Required: Universal Steering Linkage Puller (J 24319-B).

  1. Raise and support the vehicle.
  2. Remove the tire and wheel.
  3. Remove the lock nut (3) from the outer tie rod (1).
  4. Loosen the jam nut (2) on the inner tie rod (1).
  5. Using J 24319-B remove the outer tie rod from the steering knuckle.
  6. Remove the outer tie rod (3) from the inner tie rod (1).

Scheme 17

Scheme 17: Installation Procedure
Scheme 17: Installation Procedure
  1. Install the outer tie rod (3) to the inner tie rod (1). Do not tighten the jam nut (2).
  2. Install the outer tie rod (1) to the steering knuckle (2). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  3. Install the outer tie rod lock nut (3). Tighten the tie rod lock nut to 30 N.m (22 ft lbs) plus an additional 180 degrees.
  4. Install the tire and wheel.
  5. Lower vehicle.
  6. Adjust the toe alignment. Refer to «FRONT TOE ADJUSTMENT»(/buick/lesabre/viii-2000-2005/remont/wheel-alignment/#wheel-alignment-specifications-adjustment-procedures__front-toe-adjustment) in Wheel Alignment.

RACK & PINION BOOT REPLACEMENT - ON VEHICLE

Note. Tools Required: Universal Steering Linkage Puller (J 24319-B) and Keystone Clamp Plier (J 22610).

  1. Raise and support the vehicle.
  2. Remove the tire and wheel.
  3. Remove the outer tie rod. Refer to «TIE ROD END REPLACEMENT - OUTER»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__tie-rod-end-replacement-outer) .
  4. Remove the hex jam nut (2) from the inner tie rod.
  5. Remove the tie rod end clamp (2) from the rack and pinion boot (1).
  6. Remove the rack and pinion boot clamp from the rack and pinion boot.
  7. Remove the rack and pinion boot (1) from the steering gear.
  1. Install the rack and pinion boot (3) to the steering gear.
  2. Install a new rack and pinion boot clamp.
  3. Using J 22610 Crimp the rack and pinion boot clamp.
  4. Install the tie rod end clamp (2) to the rack and pinion boot (1).
  5. Install the hex jam nut (2) to the inner tie rod assembly.
  6. Install the outer tie rod. Refer to «TIE ROD END REPLACEMENT - OUTER»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__tie-rod-end-replacement-outer) .
  7. Install the tire and wheel.
  8. Lower the Vehicle.
  9. Adjust the toe alignment. Refer to «FRONT TOE ADJUSTMENT»(/buick/lesabre/viii-2000-2005/remont/wheel-alignment/#wheel-alignment-specifications-adjustment-procedures__front-toe-adjustment) in Wheel Alignment.
  1. Raise and support the vehicle.
  2. Remove the steering gear heatshield. Refer to «POWER STEERING GEAR HEAT SHIELD REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  3. Install a drain pan under the vehicle.
  4. Remove the power steering hose retainer (2) from the engine frame at gear.
  5. 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 vehicle.

Scheme 18

Scheme 18: Installation Procedure
Scheme 18: Installation Procedure
  1. Install the power steering pressure hose to the vehicle. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the power steering pressure hose to the power steering pump. Tighten the power steering pressure hose to the power steering pump to 30 N.m (22 ft lbs).
  3. Install the power steering pressure hose to the power steering gear. Tighten the power steering pressure hose to the power steering gear to 30 N.m (22 ft lbs).
  4. Install the power steering hose retainer (2) to the engine frame.
  5. Install the power steering pressure hose into the power steering hose retainer.
  6. Install the power steering gear heatshield. Refer to «POWER STEERING GEAR HEAT SHIELD REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  7. Lower the vehicle.
  8. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle.
  2. Remove the power steering gear heatshield. Refer to «POWER STEERING GEAR HEAT SHIELD REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  3. Install a drain pan under the vehicle.
  4. Remove the power steering return hose (4) from the power steering gear.
  5. Disconnect the power steering return hose from the power steering pump.
  6. Remove the power steering return hose retainers on the frame.
  7. Remove the power steering return hose from the vehicle.

Scheme 19

Scheme 19: Installation Procedure
Scheme 19: Installation Procedure
  1. Install the power steering return hose to the vehicle.
  2. Connect the power steering return hose retainers to the frame.
  3. Install the power steering return hose to the power steering pump. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the power steering return hose (4) to the power steering gear. Tighten the power steering return hose to the power steering gear to 30 N.m (22 ft lbs).
  5. Install the power steering gear heatshield. Refer to «POWER STEERING GEAR HEAT SHIELD REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  6. Lower the vehicle.
  7. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  8. Inspect the power steering system for leaks.
  1. Raise and support the vehicle. Remove the stabilizer shaft links. Refer to «STABILIZER SHAFT LINK REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/suspension-front/#front-suspension-system) in Front Suspension. Rotate the stabilizer shaft downwards.
  2. Remove the plastic clip from the power steering gear heat shield.
  3. Remove the power steering gear heat shield retaining bolts.
  4. Remove the power steering gear heat shield.

Scheme 20

Scheme 20: Installation Procedure
Scheme 20: Installation Procedure
  1. Install the power steering gear heat shield. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the power steering gear heat shield retaining bolts. Tighten the power steering gear heat shield retaining bolts to 9 N.m (79 in lbs).
  3. Install the plastic clip to the power steering gear heat shield.
  4. Install the stabilizer shaft links. Refer to «STABILIZER SHAFT LINK REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/suspension-front/#front-suspension-system) in Front Suspension.
  5. Lower the vehicle.

POWER STEERING GEAR REPLACEMENT

Note. Tools Required: Steering Column Anti-Rotation Pin (J 42640) and Universal Steering Linkage Puller (J 24319-B).

  1. Lock the steering column by installing J 42640 into the underside of the steering column.
  2. Raise and support the vehicle.
  3. Remove the tires and wheels.
  4. Remove the power steering gear heatshield. Refer to «POWER STEERING GEAR HEAT SHIELD REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) . WARNING: Failure to disconnect the Intermediate shaft from the rack and pinion stub shaft can result In damage to the steering gear and/or Intermediate shaft. This damage can cause loss of steering control which could result In personal Injury. CAUTION: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the coil assembly in the steering column to become uncentered which will cause damage to the coil assembly.
  5. Remove the intermediate shaft lower pinch bolt, coupling.
  6. Disconnect the intermediate shaft from the power steering gear.
  7. Remove the outer tie rods retaining nuts.
  8. Using the J 24319-B separate the outer tie rods from the steering knuckles.
  9. Remove the power steering pressure and return hoses (1 & 2) from the power steering gear.
  10. If equipped, disconnect the variable effort steering electrical connector.
  11. Remove the left stabilizer shaft insulator. Refer to «STABILIZER SHAFT INSULATOR REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/suspension-front/#front-suspension-system) in Front Suspension.
  12. Disconnect the tie rod ends from the knuckles.
  13. Remove the power steering gear mounting bolts.
  14. Remove the power steering gear through the left wheel opening.
  15. Transfer the outer tie rods if replacing the power steering gear.

Scheme 21

Scheme 21: Installation Procedure
Scheme 21: Installation Procedure
  1. Install the power steering gear through the left wheel opening. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the power steering gear mounting bolts. Tighten the power steering gear mounting bolts to 95 N.m (70 ft lbs).
  3. Install the left stabilizer shaft insulator. Refer to «STABILIZER SHAFT INSULATOR REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/suspension-front/#front-suspension-system) in Front Suspension.
  4. Install the power steering pressure and return hoses (1 & 2) to the power steering gear. Tighten the power steering pressure and return hoses to 30 N.m (22 ft lbs).
  5. If equipped, connect the variable effort steering electrical connector.
  6. Install the outer tie rod (1) to the steering knuckles.
  7. Install the outer tie rod retaining nuts. Tighten the outer tie rod retaining nuts to 70 N.m (52 ft lbs).
  8. Connect the intermediate shaft to the power steering gear.
  9. Install the intermediate shaft lower pinch bolt. Tighten the intermediate shaft lower pinch bolt to 45 N.m (33 ft lbs).
  10. Install the tires and wheels.
  11. Lower the vehicle.
  12. Remove the J 42640 from the steering column.
  13. Bleed the power steering system. Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  14. Check the power steering system for leaks.
  15. Adjust the front toe. Refer to «FRONT TOE ADJUSTMENT»(/buick/lesabre/viii-2000-2005/remont/wheel-alignment/#wheel-alignment-specifications-adjustment-procedures__front-toe-adjustment) in Wheel Alignment.

RACK & PINION GEAR RACK BEARING PRELOAD ADJUSTMENT - OFF VEHICLE (QUIET VALVE)

  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). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the adjuster plug lock nut (1) to the adjuster plug. Hold the adjuster plug stationary while tightening the adjuster plug lock nut (1) to 68 N.m (50 ft lbs).

RACK & 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). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the adjuster plug lock nut (1) to the adjuster plug. Hold the adjuster plug stationary while tightening the adjuster plug lock nut (1) to 68 N.m (50 ft lbs).

RACK & PINION BOOT REPLACEMENT - OFF VEHICLE

Note. Tools Required: Keystone Clamp Pliers (J 22610).

  1. To remove the outer tie rod; refer to «TIE ROD END REPLACEMENT - OUTER»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__tie-rod-end-replacement-outer) .
  2. Remove the hex 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) from the rack and pinion gear assembly.
  1. Install the new boot clamp (2) onto the rack and pinion boot (1).
  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). NOTE: The rack and pinion boot (3) must not be twisted, puckered or out of shape in any way. If the rack and pinion boot (3) is not shaped properly, adjust the rack and pinion boot (3) by hand before installing the boot clamp.
  4. 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.
  5. Install the boot clamp (1) on the rack and pinion boot (2) with J 22610.
  6. Crimp the boot clamp (1).
  7. Pinch the pliers together on the rack and pinion boot (2) in order to install the tie rod end clamp.
  8. Install the hex jam nut (2) to the inner tie rod assembly (1).
  9. To assemble the outer tie rod assembly; refer to «TIE ROD END REPLACEMENT - OUTER»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__tie-rod-end-replacement-outer) .
  1. To remove the rack and pinion boot. Refer to «RACK & PINION BOOT REPLACEMENT - OFF VEHICLE»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__rack-pinion-boot-replacement) .
  2. Place the gear in a vise. CAUTION: Do not change the steering gear preload adjustment before moving the inner tie rod from the steering gear. Changing the steering gear preload adjustment before moving the inner tie rod could result in damage to the pinion and the steering gear.
  3. Remove the shock dampener (4) from the inner tie rod assembly (6).
  4. Slide the shock dampener (4) back on the rack (5). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). CAUTION: Do not change the steering gear preload adjustment before moving the inner tie rod from the steering gear. Changing the steering gear preload adjustment before moving the inner tie rod could result in damage to the pinion and the steering gear.
  8. Remove the shock dampener (3) from the inner tie rod housing (2).
  9. Slide the shock dampener (3) back on the rack (5). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). NOTE: Threads must be clean prior to LOCTITE® application. Check LOCTITE® or equivalent container for expiration date. Use only enough LOCTITE® to evenly coat threads. If male rack (3) and female inner tie rod (2) do not apply LOCTITE®.
  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). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  4. Place a pipe wrench on the rack (3) next to the inner tie rod housing (2). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  5. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (2). Tighten the inner tie rod to 100 N.m (74 ft lbs).
  6. Slide the shock dampener (2) forward onto the rack. NOTE: Threads must be clean prior to LOCTITE® application. Check LOCTITE® or equivalent container for expiration date. Use only enough LOCTITE® to evenly coat threads. If male rack and female inner tie rod (1) do not apply LOCTITE®.
  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. CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). Tighten the inner tie rod to 100 N.m (74 ft lbs).
  11. Place the inner tie rod assembly (2) in a vise. NOTE: If female rack (1) and male inner tie rod (2) do not stake. If male rack (1) and female inner tie rod (2) you must stake.
  12. Stake both sides of the female inner tie rod assembly housing to the male rack.
  13. Insert a 0.25 mm gauge (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. Refer to «RACK & PINION BOOT REPLACEMENT - OFF VEHICLE»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__rack-pinion-boot-replacement) .

TIE ROD REPLACEMENT - INNER (MAGNASTEER)

Note. Tools Required: Inner Tie Rod Wrench (J 34028).

  1. To remove the rack and pinion boot. Refer to «RACK & PINION BOOT REPLACEMENT - OFF VEHICLE»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__rack-pinion-boot-replacement) .
  2. Place the gear in a vise. CAUTION: Do not change the steering gear preload adjustment before moving the inner tie rod from the steering gear. Changing the steering gear preload adjustment before moving the inner tie rod could result in damage to the pinion and the steering gear.
  3. Remove the shock dampener (6) from the inner tie rod housing (4).
  4. Slide the shock dampener (6) back on the rack (5). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). NOTE: Threads must be clean prior to LOCTITE® application. Check LOCTITE®, or equivalent, container for expiration date. Use only enough LOCTITE® to evenly coat threads. If male rack (3) and female inner tie rod (2) do not apply LOCTITE®.
  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). CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  4. Place a pipe wrench on the rack (3) next to the inner tie rod housing (2). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  5. Place a torque wrench and J 34028 on the flats of the inner tie rod housing (2). Tighten the inner tie rod to 100 N.m (74 ft lbs).
  6. Slide the shock dampener (2) forward onto the rack. NOTE: Threads must be clean prior to LOCTITE® application. Check LOCTITE®, or equivalent, container for expiration date. Use only enough LOCTITE® to evenly coat threads. If male rack and female inner tie rod (1) do not apply LOCTITE®.
  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. CAUTION: The pipe wrench must be placed at the valve end of the steering gear and positioned up against the inner tie rod housing. Placing the pipe wrench in any other location will cause damage to the steering gear.
  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). Tighten the inner tie rod to 100 N.m (74 ft lbs).
  11. Place the inner tie rod assembly (2) in a vise. NOTE: If female rack (1) and male inner tie rod (2) do not stake. If male rack (1) and female inner tie rod (2) you must stake.
  12. Stake both sides of the female inner tie rod assembly housing to the male rack (1).
  13. Insert a 0.25 mm gauge (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. Refer to «RACK & PINION BOOT REPLACEMENT - OFF VEHICLE»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system__rack-pinion-boot-replacement) .
  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).

Scheme 22

Scheme 22: Assembly Procedure
Scheme 22: Assembly Procedure
  1. Inspect the cylinder lines (1) for the following items: Cracks. Dents. Damage to the threads.
  2. Replace the parts as needed. NOTE: Carefully align the threads on all of the fittings. Finger tighten the fittings in order to avoid stripping and cross-threading the fittings.
  3. Install the new O-ring seals (1) to the valve end of the cylinder lines. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. NOTE: Flush and bleed power steering system (hoses, reservoir and cooler lines) with power steering fluid GM P/N 1050017, Canadian P/N 992646 (or equivalent meeting GM Specification number 9985010). Refer to «BLEEDING POWER STEERING SYSTEM»(/buick/lesabre/viii-2000-2005/remont/manual-power-steering/#power-steering-system) .
  4. Install the cylinder line assemblies (1) to the gear assembly (2). Tighten the valve end fittings to 16.9 N.m (12.6 ft lbs). Tighten the cylinder end fittings to 27 N.m (20 ft lbs).
  1. Loosen both cylinder line fittings on the cylinder end of the gear assembly.
  2. Loosen both fittings on the cylinder line assemblies (1) 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).

Scheme 23

Scheme 23: Assembly Procedure
Scheme 23: Assembly Procedure
  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. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the cylinder line assemblies (1) to the gear assembly (2). Tighten the valve end fittings to 16.9 N.m (12.6 ft lbs) Tighten the cylinder end fittings to 27 N.m (20 ft lbs)

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 and 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.

Scheme 24

Scheme 24: SPECIAL TOOLS & EQUIPMENT
Scheme 24: SPECIAL TOOLS & EQUIPMENT

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26