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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 966 (Power Steering System) >> Repair Instructions >> Rack Piston and Worm Shaft Replacement - Off Vehicle (700 Gear) >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Do not remove the needle bearing when removing the pitman shaft arm and its components.
  1. Remove the pitman shaft seals and bearing. Refer to Pitman Shaft Seals and Bearing Replacement - Off Vehicle (700 Gear)  or Pitman Shaft Seals and Bearing Replacement - Off Vehicle (670 Gear) .
  2. Remove the housing end plug. Refer to Steering Gear Housing End Plug Replacement - Off Vehicle .
  3. Turn the stub shaft counterclockwise until the rack piston (2) begins to come out of the steering gear housing (3).
    Fig 1: Removing Rack Piston (700 Gear)
    GM322017Courtesy of GENERAL MOTORS CORP.
  4. Remove the rack piston plug (1).
  5. Insert J 21552 into the bore of the rack piston (2).
  6. Hold J 21552 tightly against the worm shaft while turning the stub shaft counterclockwise. Turning the stub shaft forces the rack piston (2) onto J 21552. The rack piston balls remain in place.
  7. Remove the following items as an assembly from the steering gear housing (9):
    • The rack piston (4)
    • The rack piston screws (8), clamp (7), ball guide (6) and balls (5)
    • J 21552
    Fig 2: Exploded View Of Rack Piston Assembly (700 Gear)
    GM322087Courtesy of GENERAL MOTORS CORP.
  8. Remove the spool valve assembly. Refer to Steering Gear Valve Replacement - Off Vehicle (700 Gear) .
  9. Remove the worm shaft (14).
  10. Remove the thrust bearing (12) and the flat races (11, 13).
    11. IMPORTANT: When removing J 21552, watch for falling piston balls (5) from inside the rack piston (4).
  11. Remove J 21552 from the rack piston (4).
  12. Remove the rack piston balls (5).
  13. Remove the following items from the rack piston (4):
    1. The screws (8)
    2. The clamp (7)
    3. The ball guide (6)
    4. The remaining rack piston balls (5) in the ball guide (6)
  14. Remove the teflon ring (2).
  15. Remove the O-ring seal (3).
  16. Clean all of the disassembled parts.
  17. Inspect all of the disassembled parts for wear.
  18. Replace the parts if necessary.
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