GM Full Size Vans 1987-1997 Repair Guide

Power Steering Pump

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REMOVAL & INSTALLATION



See Figures 1 through 5

  1. 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.
  2.  
  3. Cap the pump fittings.
  4.  
  5. Loosen the bracket-to-pump mounting nuts.
  6.  



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Fig. Fig. 1: Removing the steering pump pulley



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Fig. Fig. 2: Installing the power steering pump pulley

  1. Remove the pump drive belt.
  2.  
  3. Remove the pulley with a puller such as J 25034-B, except for the 7.4L engine (on which the power steering pump pulley can be replaced after removal).
  4.  
  5. Remove the bracket-to-pump bolts and remove the pump from the van.
  6.  



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Fig. Fig. 3: Location of the power steering pump pulley - 4.3L engine



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Fig. Fig. 4: Location of the power steering pump pulley - 5.7L engine



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Fig. Fig. 5: Location of the power steering pump pulley - 6.5L diesel and 7.4L gasoline engines

To install:

On 7.4L engines, install the pulley on the new pump with a forcing screw and washer tool (such as J 25033-B) before installing the pump.

  1. Install the pump, then install the pulley on the new pump with a forcing screw and washer tool, then tighten all bolts and nuts securely.
  2.  
  3. Fill the reservoir and bleed the pump by turning the pulley counterclockwise (as viewed from the front) until bubbles stop forming.
  4.  
  5. Install the drive belt.
  6.  
  7. Bleed the system as outlined below.
  8.  

BLEEDING



1987-95 Models
  1. Fill the reservoir to the proper level and let the fluid remain undisturbed for at least 2 minutes.
  2.  
  3. Start the engine and run it for only about 2 seconds.
  4.  
  5. Add fluid as necessary.
  6.  
  7. Repeat Steps 1-3 until the level remains constant.
  8.  
  9. Raise the front of the vehicle so that the front wheels are off the ground. Set the parking brake and block both rear wheels front and rear. Manual transmissions should be in Neutral; automatic transmissions should be in Park.
  10.  
  11. Start the engine and run it at approximately 1500 rpm.
  12.  
  13. Turn the wheels (off the ground) to the right and left, lightly contacting the stops.
  14.  
  15. Add fluid as necessary.
  16.  
  17. Lower the vehicle and turn the wheels right and left on the ground.
  18.  
  19. Check the level and refill as necessary.
  20.  
  21. If the fluid is extremely foamy, let the van stand for a few minutes with the engine off and repeat the procedure. Check the belt tension and check for a bent or loose pulley. The pulley should not wobble with the engine running.
  22.  
  23. Check that no hoses are contacting any parts of the van, particularly sheet metal.
  24.  
  25. Check the oil level and refill as necessary. This step and the next are very important. When filling, follow Steps 1-10.
  26.  
  27. Check for air in the fluid. Aerated fluid appears milky. If air is present, repeat the above operation. If it is obvious that the pump will not respond to bleeding after several attempts, a pressure test may be required.
  28.  

The procedures for maintaining, adjusting, and repairing the power steering systems and components discussed in this section are to be done only after determining that the steering linkages and front suspension systems are correctly aligned and in good condition. All worn or damaged parts should be replaced before attempting to service the power steering system. After correcting any condition that could affect the power steering, do the preliminary tests of the steering system components.

1996-97 Models
  1. Turn the ignition OFF .
  2.  
  3. Raise the front of the vehicle so that the front wheels are off the ground.
  4.  
  5. Turn the steering wheel to its full left position.
  6.  
  7. Fill the reservoir to the Full Cold level and leave the cap off.
  8.  
  9. With the ignition still in the OFF position, turn the wheel lock-to-lock at least 20 times (on models with long return lines perform this procedure 40 times).
  10.  
  11. Ensure that the fluid level remains at the Full Cold level and that there is no spilled fluid or air bubbles that could indicate a loose connection or leaking O-ring seal.
  12.  
  13. Turn the ignition ON and with the engine idling, check the fluid level. If the level is correct install the cap.
  14.  
  15. Return the wheels to the center position and lower the vehicle.
  16.  
  17. With engine still running, turn the wheel from side-to-side. If there is a smooth, noiseless and leak free operation the procedure is complete.
  18.  
  19. If there is a problem, check that the fluid is free of bubbles and that the O-rings and clamps are in good condition. If not replace the worn or damaged part(s) and repeat the bleeding procedure.
  20.  

 
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