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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 >> Assembly Procedure

Assembly 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: Exploded View Of Rack Piston Assembly (700 Gear)
    GM322018Courtesy of GENERAL MOTORS CORP.
  1. Install the O-ring seal (3) and the teflon ring (2).
  2. Lubricate both parts with power steering fluid.
  3. Install the worm shaft (14) to the rack piston (4) outside of the steering gear housing (9).

    Fully seat the worm shaft to the rack piston.

    4. Fig 2: Aligning The Worm Shaft Spiral Groove With The Rack Piston Ball Return Guide Hole (700 Gear)
    GM322019Courtesy of GENERAL MOTORS CORP.
  4. Align the worm shaft spiral groove with the rack piston ball return guide hole (1).
    5. CAUTION: In order to avoid injury and/or component damage, install all of the rack piston balls into the rack piston. Install the rack piston balls in the correct order. If you do not correctly install all of the rack piston balls, the steering gear may not operate or may wear out quickly.
  5. Lubricate the rack piston balls with power steering fluid.
  6. Insert the rack piston balls through the ball return guide hole (1) while turning worm shaft (2) counterclockwise in order to install the rack piston balls into the rack piston. Install the black and the silver rack piston balls alternately into the rack piston and the ball guide to maintain the rack piston to the worm shaft preload.
    7. Fig 3: View Of Rack Piston Balls & Ball Guide
    GM322022Courtesy of GENERAL MOTORS CORP.
  7. Install the remaining rack piston balls (3) into the ball guide (1) using grease at each end (2) to retain the rack piston balls (3).
    8. Fig 4: View Of Ball Guide, Ball Guide Clamp, Rack Piston & Screws
    GM740395Courtesy of GENERAL MOTORS CORP.
  8. Install the ball guide (3) to the rack piston (2).
  9. Install the ball guide clamp (4).
    10. NOTE: Refer to Fastener Notice .
  10. Install the screws (5).

    Tighten:  Tighten the screws (5) to 6 N.m (53 lb in).

  11. Insert J 21552  into the bore of the rack piston while turning the worm shaft counterclockwise. See Special Tools . The turning of the worm shaft forces the rack piston onto J 21552  . See Special Tools . The rack piston balls remain in place.
    12. Fig 5: Identifying Flat Races, Thrust Bearing And Worm Shaft (700 Gear)
    GM322025Courtesy of GENERAL MOTORS CORP.
  12. Install the flat races (2, 4) and the thrust bearing (3) onto the worm shaft (1).
    13. Fig 6: View Of Worm Shaft, Steering Gear Housing, Rack Piston, Rack Piston Plug & J 21552
    GM322026Courtesy of GENERAL MOTORS CORP.
  13. Install the worm shaft (4) to the steering gear housing (3).
    14. IMPORTANT: Do not adjust the worm shaft until all components are installed onto the steering gear housing.
  14. Install the spool valve. Refer to Steering Gear Valve Replacement - Off Vehicle .
  15. Install the rack piston (2) to the worm (4) from J 21552  using J 8947  to compress the seals. See Special Tools .
  16. Hold J 21552  tightly against the worm shaft (4). See Special Tools .
  17. Turn the stub shaft clockwise until the rack piston (2) is seated on the worm shaft (4).
  18. Remove J 21552  from the rack piston (1). See Special Tools .
  19. Install the rack piston plug (1).

    Tighten:  Tighten the rack piston plug to 150 N.m (111 lb ft).

  20. Install the housing end plug. Refer to Steering Gear Housing Plug Replacement - Off Vehicle .
    21. IMPORTANT: Do not adjust the Pitman shaft until all components are installed onto the steering gear housing.
  21. Install the Pitman shaft seals and bearing. Refer to Pitman Shaft Seals and Bearing Replacement - Off Vehicle .
  22. To adjust the steering gear; refer to one of the following procedures:
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