GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Power Steering Pump

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See Figure 1

Two types of power steering pumps are commonly found on these vehicles; the submerged and the non-submerged types. The submerged pump has a housing and internal parts which are inside the reservoir and operate submerged in oil. The non-submerged pump functions the same as the submerged pump except the reservoir is separate from the housing and internal parts.



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Fig. Fig. 1: Two types of power steering pumps are commonly found on these vehicles

REMOVAL & INSTALLATION



Except Typhoon

See Figures 2, 3, 4 and 5

  1. Position a fluid catch pan under the power steering pump.
  2.  
  3. Disconnect the feed and return hoses from the power steering pump, then drain the excess fluid into the catch pan.
  4.  

On models equipped with a remote fluid reservoir, disconnect and plug the hose(s) in order to prevent system contamination or excessive fluid loss.

  1. For 1993 vehicles, properly unload the serpentine drive belt tensioner assembly.
  2.  
  3. Remove the drive belt from the pulley.
  4.  
  5. Install a puller tool such as J-25034, or equivalent onto the power steering pump pulley. While holding the pilot bolt, turn the tool nut counterclockwise in order to press the drive pulley from the pump.
  6.  

When installing the puller tool onto the power steering pump pulley, be sure that the pilot bolt bottoms in the pump shaft by turning the head of the pilot bolt.



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Fig. Fig. 2: Installing the pilot bolt



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Fig. Fig. 3: Installing the puller



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Fig. Fig. 4: Removing the power steering pump pulley



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Fig. Fig. 5: Installing the power steering pump pulley

  1. Remove the power steering pump-to-bracket bolts, then remove the pump from the vehicle.
  2.  

To install:
  1. Position the pump to the vehicle and secure using the retaining bolts and, if equipped, the rear brace.
  2.  
  3. Use a pulley installer such as J-25033 or equivalent to press the drive pulley onto the power steering pump. While holding the pilot bolt, turn the tool nut clockwise in order to press the drive pulley onto the pump.
  4.  

When positioning the installer tool onto the power steering pump pulley, be sure that the pilot bolt bottoms in the pump shaft by turning the head of the pilot bolt.

  1. Properly install the drive belt.
  2.  

Be sure to secure any hoses which may get in the way or rub other components.

  1. Remove the caps, then connect the feed and return hoses to the pump.
  2.  
  3. Properly refill and bleed the power steering system.
  4.  
  5. Test drive the vehicle.
  6.  

Typhoon
  1. Disconnect the negative battery cable, then remove the air cleaner and duct.
  2.  
  3. Remove the upper fan shroud screws and shroud.
  4.  
  5. Loosen the fan nuts, then remove the serpentine drive belt.
  6.  
  7. Remove the fan-to-water pump pulley nuts, then remove the fan and pulley assembly.
  8.  
  9. Install J-25034-B to the steering pump pulley. Make sure the pilot bolt bottoms in the pump shaft by turning the nut to the top of the pilot bolt. Hold the pilot bolt and turn the nut counterclockwise in order to drive the pulley from the shaft.
  10.  
  11. Raise and support the front of the vehicle safely using jackstands.
  12.  
  13. Remove the left wheel, the remove the left wheelhousing panel screws and the panel.
  14.  
  15. Position a drain pan below the pump assembly, then remove the bolt from the hose bracket.
  16.  
  17. Disconnect the return and pressure hoses from pump. Immediately cap or plug all openings to prevent excess fluid loss or system contamination.
  18.  
  19. Remove the bolts from the rear bracket, at the alternator.
  20.  
  21. From underhood, remove the pump and rear bracket. If necessary, remove the nuts and separate the pump from the bracket.
  22.  

To install:
  1. If separated, install the rear bracket to the pump and tighten the retaining nuts to 37 ft. lbs. (50 Nm).
  2.  
  3. Install the pump and rear bracket assembly to the vehicle.
  4.  
  5. Install the bolts to the rear bracket, at the alternator, then tighten the retaining nuts to 37 ft. lbs. (50 Nm).
  6.  
  7. From under the vehicle, remove the caps or plugs, then connect the pressure and return hoses to the pump. Tighten the fittings to 20 ft. lbs. (27 Nm).
  8.  
  9. Install the retaining bolt to the hose bracket.
  10.  
  11. Install the left wheelhousing panel and secure using the screws, then install the left wheel.
  12.  
  13. Remove the jackstands and carefully lower the vehicle.
  14.  
  15. Install the pulley to the pump using J-225033-B or an equivalent tool. First, place the pulley on the pump shaft, then install the tool, making sure the pilot bolt bottoms in the pump shaft by turning the nut to the top of the pilot bolt. Hold the pilot bolt and turn the nut clockwise in order to drive the pulley into position.
  16.  
  17. Install the fan and pulley assembly, then tighten the pulley nuts to 18 ft. lbs. (24 Nm).
  18.  
  19. Install the serpentine drive belt.
  20.  
  21. Install the upper fan shroud, then tighten the retainers to 89 inch lbs. (10 Nm).
  22.  
  23. Install the air cleaner and duct.
  24.  
  25. Connect the negative battery cable, then properly refill and bleed the power steering system.
  26.  

SYSTEM BLEEDING



  1. Add fluid to the reservoir until the proper level is reached, then allow the fluid to settle for at least 2 minutes. Start the engine and let it run for a few seconds, then turn it off and check if the level has changed. Repeat this until the level remains constant.
  2.  
  3. Raise and support the front of the vehicle safely using jackstands under the frame to the wheels are free to turn.
  4.  
  5. Start and run the engine, then slowly turn the wheels in both directions (lightly hitting the stops) several times.
  6.  
  7. Stop the engine and check the fluid level. If necessary, add power steering fluid to obtain the level indicated on the reservoir.
  8.  

Maintain the fluid level just above the internal pump casting. Fluid with air in it will have a light tan or milky appearance. This air must be eliminated from the fluid before normal steering action can be obtained.

  1. Remove the jackstands and carefully lower the vehicle.
  2.  
  3. Start and run the engine while turning the wheel slowly from stop to stop.
  4.  
  5. Stop the engine and check the fluid level. If necessary, add fluid in order to obtain the proper indicated level.
  6.  
  7. If the fluid is extremely foamy, allow the vehicle to stand for a few minutes, then repeat the procedure through this step.
  8.  
  9. Road test the vehicle to make sure the steering functions normally and is free from noise.
  10.  
  11. Allow the vehicle to stand for 2-3 hours, then recheck the power steering fluid.
  12.  

 
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