GM Full-Size Trucks 1988-1998 Repair Information

Power Steering Pump

Print

REMOVAL & INSTALLATION



R/V Series

See Figure 1

  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.  



Click image to see an enlarged view

Fig. Fig. 1: Removing and installing the pulley

  1. Remove the pump drive belt.
  2.  
  3. Remove the bracket-to-pump bolts and remove the pump from the truck.
  4.  

To install:
  1. If a new pump is being installed, remove the pulley with a pulley puller such as J-25034-B. Install the pulley on the new pump with a forcing screw and washer.
  2.  
  3. Install the pump and tighten all bolts and nuts securely.
  4.  
  5. Fill the reservoir and bleed the pump by turning the pulley counterclockwise (as viewed from the front) until bubbles stop forming.
  6.  
  7. Bleed the system as outlined.
  8.  

C/K Series
  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 belt tensioner.
  6.  
  7. Remove the pump drive belt.
  8.  
  9. Remove the pulley with a pulley puller such as J-29785-A.
  10.  
  11. Remove the following fasteners:

    6-4.3L, 8-5.0L, 8-5.7L engines: front mounting bolts
     
    8-7.4L engine: rear brace
     
    8-6.2L/6.5L diesel: front brace and rear mounting nuts
     

  12.  

  1. Lift out the pump.
  2.  

To install:
  1. Observe the following torques:

    6-4.3L, 8-5.0L, 8-5.7L engines, front mounting bolts: 37 ft. lbs. (50 Nm)
     
    8-7.4L engine, rear brace nut: 61 ft. lbs. (82 Nm); rear brace bolt: 24 ft. lbs. (32 Nm); mounting bolts: 37 ft. lbs. (50 Nm)
     
    8-6.2L/6.5L diesel, front brace: 30 ft. lbs. (40 Nm); rear mounting nuts: 17 ft. lbs. (23 Nm).
     

  2.  
  3. Install the pulley with J-25033-B.
  4.  
  5. Install the drive belt.
  6.  
  7. Install the hoses.
  8.  
  9. Fill and bleed the system.
  10.  

BLEEDING THE HYDRAULIC SYSTEM



The procedures for maintaining, adjusting, and repairing the power steering systems and components discussed in this chapter 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.

  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 truck 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 truck, particularly sheet metal.
  24.  
  25. Check the oil level and refill as necessary. This step and the next are very important. When willing, follow Steps 1-10 above
  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.  

 
label.common.footer.alt.autozoneLogo