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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Power Steering) >> Repair Instructions >> Rack Piston and Worm Shaft Replacement - Off Vehicle >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Rack Piston, Steering Gear Housing, Rack Piston Plug & J 21552
    GM322017Courtesy of GENERAL MOTORS CORP.
    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 .
  2. Remove the housing end plug. Refer to Steering Gear Housing 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).
  4. Remove the rack piston plug (1).
  5. Insert J 21552  into the bore of the rack piston (2). See Special Tools .
  6. Hold J 21552  tightly against the worm shaft while turning the stub shaft counterclockwise. See Special Tools . Turning the stub shaft forces the rack piston (2) onto J 21552  . See Special Tools . The rack piston balls remain in place.
    7. Fig 2: Exploded View Of Rack Piston Assembly (700 Gear)
    GM322087Courtesy of GENERAL MOTORS CORP.
  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  . See Special Tools .
  8. Remove the spool valve assembly. Refer to Steering Gear Valve Replacement - Off Vehicle .
  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). See Special Tools .
  11. Remove J 21552  from the rack piston (4). See Special Tools .
  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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