Silverado 2008

Power Steering Pump

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Bleeding



Observe the following:



Use clean, new power steering fluid type only
 
Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle.
 
Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.
 


NOTE
Power steering fluid level must be maintained throughout bleed procedure.

  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE
    With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF . This will discharge the hydro-boost accumulator.

  2.  
  3. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2.  
    3. Firmly apply the brake pedal 10-15 times.
    4.  
    5. Turn the engine OFF
    6.  

  4.  
  5. Raise the vehicle until the front wheels are off the ground.
  6.  
  7. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  8.  
  9. Verify power steering fluid level per operating specification.
  10.  
  11. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  12.  
  13. Verify the fluid level. Repeat the bleed procedure if necessary.
  14.  

Removal & Installation



4.3L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    When performing service on or near the SRS components, or SRS wiring the SRS must be disabled. Failure to observe the correct procedure could cause deployment of the SRS components. Serious injury can occur.

  2.  
  3. Position the steering wheel so the front wheels are in the straight ahead position.
  4.  
  5. Be sure the ignition switch is in the OFF position.
  6.  
  7. Disconnect the negative battery cable.
    NOTE
    The SDM may have more than one fused power input. To ensure that there is no unwanted SRS deployment, personal injury, or unnecessary SRS system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator will illuminate. This is normal and does not indicate a SRS system malfunction.

  8.  
  9. Locate and remove the fuses supplying power to the SDM.
  10.  
  11. Wait one minute before working on the vehicle.
  12.  
  13. Install tool J42640 into the steering column lower access hole. Lock the steering column.

    Click image to see an enlarged view

    Fig. Steering column anti-rotation pin tool J42640 installation

  14.  
  15. Raise and support the vehicle.
  16.  
  17. Remove as much power steering fluid from the reservoir as possible.
  18.  
  19. Remove the skid plate, if equipped.

    Click image to see an enlarged view

    Fig. Skid plate and related components-type one



    Click image to see an enlarged view

    Fig. Skid plate and related components-type two



    Click image to see an enlarged view

    Fig. Disconnecting the upper intermediate shaft

  20.  
  21. Disconnect the steering shaft coupling from the gear.
  22.  
  23. Disconnect the hoses at the pump. When the hoses are disconnected, secure the ends in a raised position to prevent leakage. Cap the ends of the hoses to prevent the entrance of dirt.
  24.  
  25. Cap the pump fittings.
  26.  
  27. Loosen the belt tensioner.
  28.  
  29. Remove the pump drive belt.
  30.  
  31. Remove the pulley with a pulley puller such as J-29785-A.
  32.  
  33. Remove the pump rear bracket nuts. Remove the pump bolts.

    Click image to see an enlarged view

    Fig. Power steering pump removal-view one



    Click image to see an enlarged view

    Fig. Power steering pump removal-view two



    Click image to see an enlarged view

    Fig. Power steering pump removal-view three

  34.  
  35. Remove the pump bracket bolts and nut.
  36.  
  37. Pull the pump bracket forward. Separate the pump assembly from the pump bracket.
  38.  

To install:

  1. Observe the following torque:

    Front mounting bolts: 37 ft. lbs. (50 Nm)
     

  2.  
  3. Install the pulley with J-25033-.

    Click image to see an enlarged view

    Fig. Power steering pump pulley alignment

  4.  
  5. Install the drive belt.
  6.  
  7. Install the hoses.
  8.  
  9. Fill the pump with the proper grade and type fluid.
  10.  
  11. Bleed the system.
  12.  
  13. Start the engine and check for leaks. Correct as required.
  14.  

4.8L, 4.8L, 5.3L, 6.0L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    When performing service on or near the SRS components, or SRS wiring the SRS must be disabled. Failure to observe the correct procedure could cause deployment of the SRS components. Serious injury can occur.

  2.  
  3. Position the steering wheel so the front wheels are in the straight ahead position.
  4.  
  5. Be sure the ignition switch is in the OFF position.
  6.  
  7. Disconnect the negative battery cable.
    NOTE
    The SDM may have more than one fused power input. To ensure that there is no unwanted SRS deployment, personal injury, or unnecessary SRS system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator will illuminate. This is normal and does not indicate a SRS system malfunction.

  8.  
  9. Locate and remove the fuses supplying power to the SDM.
  10.  
  11. Wait one minute before working on the vehicle.
  12.  
  13. Install tool J42640 into the steering column lower access hole. Lock the steering column.

    Click image to see an enlarged view

    Fig. Steering column anti-rotation pin tool J42640 installation

  14.  
  15. Raise and support the vehicle.
  16.  
  17. Remove as much power steering fluid from the reservoir as possible.
  18.  
  19. Remove the skid plate, if equipped.

    Click image to see an enlarged view

    Fig. Skid plate and related components-type one



    Click image to see an enlarged view

    Fig. Skid plate and related components-type two



    Click image to see an enlarged view

    Fig. Disconnecting the upper intermediate shaft

  20.  
  21. Disconnect the steering shaft coupling from the gear.
  22.  
  23. Disconnect the hoses at the pump. When the hoses are disconnected, secure the ends in a raised position to prevent leakage. Cap the ends of the hoses to prevent the entrance of dirt.
  24.  
  25. Cap the pump fittings.
  26.  
  27. Loosen the belt tensioner.
  28.  
  29. Remove the pump drive belt.
  30.  
  31. Remove the pulley with a pulley puller such as J-29785-A.
  32.  
  33. If equipped with hydroboost, disconnect the brake booster outlet hose clamp and hose from the pump.
  34.  
  35. Remove the pump retaining bolts. Remove the pump bolts.

    Click image to see an enlarged view

    Fig. Power steering pump and related components-4.8L, 5.3L & 6.0L engines

  36.  

To install:

  1. Observe the following torque:

    Front mounting bolts: 37 ft. lbs. (50 Nm)
     

  2.  
  3. Install the pulley with J-25033-C.

    Click image to see an enlarged view

    Fig. Power steering pump pulley alignment

  4.  
  5. Install the drive belt.
  6.  
  7. Install the hoses.
  8.  
  9. Fill the pump with the proper grade and type fluid.
  10.  
  11. Bleed the system.
  12.  
  13. Start the engine and check for leaks. Correct as required.
  14.  

 
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