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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Power Steering System) >> Repair Instructions >> Rack Piston and Worm Shaft Replacement - Off Vehicle (700 Gear) >> Assembly Procedure

Assembly 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.
  1. Install the O-ring seal (3) and the teflon ring (2).
    Fig 1: Exploded View Of Rack Piston Assembly (700 Gear)
    GM322018Courtesy of GENERAL MOTORS CORP.
  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. Align the worm shaft spiral groove with the rack piston ball return guide hole (1).
    Fig 2: Aligning The Worm Shaft Spiral Groove With The Rack Piston Ball Return Guide Hole (700 Gear)
    GM322019Courtesy of GENERAL MOTORS CORP.
    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. 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).
    Fig 3: Installing The Rack Piston Balls Into The Ball Guide (700 Gear)
    GM322022Courtesy of GENERAL MOTORS CORP.
  8. Install the ball guide (3) to the rack piston (2).
    Fig 4: Installing The Ball Guide To The Rack Piston (700 Gear)
    GM740395Courtesy of GENERAL MOTORS CORP.
  9. Install the ball guide clamp (4).
    10. NOTE: Refer to Fastener Notice in Cautions and Notices.
  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. The turning of the worm shaft forces the rack piston onto J 21552. The rack piston balls remain in place.
  12. Install the flat races (2, 4) and the thrust bearing (3) onto the worm shaft (1).
    Fig 5: Installing The Flat Races And The Thrust Bearing Onto The Worm Shaft (700 Gear)
    GM322025Courtesy of GENERAL MOTORS CORP.
  13. Install the worm shaft (4) to the steering gear housing (3).
    Fig 6: Install The Worm Shaft To The Steering Gear Housing (700 Gear)
    GM322026Courtesy of GENERAL MOTORS CORP.
    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 (700 Gear) .
  15. Install the rack piston (2) to the worm (4) from J 21552 using J 8947 to compress the seals.
  16. Hold J 21552 tightly against the worm shaft (4).
  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).
  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 End 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 (700 Gear)  or Pitman Shaft Seals and Bearing Replacement - Off Vehicle (670 Gear) .
  22. To adjust the steering gear; refer to one of the following procedures:
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