GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Steering 🢒 Power Steering System 🢒 Steering Gear Worm Gear Adjuster Seal and Stub Shaft Bearing Replacement

Disassembly Procedure

Tools Required

    • J 42882 Power Steering Adjuster Nut Socket
    • J 6222-A Adjuster Plug Seal Protector
    • J 43435 Power Steering Adjuster Lock Nut Wrench

    Object Number: 509348 Size: SH
  1. Rotate the stub shaft back and forth in order to drain the power steering fluid.
  2. Remove the coupling shield retainer and the lock nut from the steering gear housing using the J 43435 and a torque wrench.

    3. Object Number: 322012 Size: SH
  3. Remove the adjuster nut assembly (2) from the steering gear housing (1) using the J 42882 .

    4. Object Number: 322011 Size: SH
  4. Remove the thrust support assembly (2) from the steering gear housing (1).
  5. Remove the O-ring seal (3) from the thrust support assembly (2).

Assembly Procedure

Tools Required

J 42882 Adjuster Nut Socket


    Object Number: 322011 Size: SH

    Important: Install a new O-ring seal each time the thrust support assembly is removed from the steering gear.

  1. Lubricate the new O-ring seal (3).
  2. Install the new O-ring seal (3) on the thrust support assembly (2).
  3. Install the thrust support assembly (2).

    4. Object Number: 322012 Size: SH
  4. Connect the adjuster nut assembly (2) to the steering gear housing (1) using the J 42882 .
  5. Install the coupling shield retainer and the lock nut (1) to the adjuster nut assembly.
  6. Adjust the worm thrust bearing preload. Refer to Steering Gear Worm Gear Thrust Bearing Preload Adjustment - Off Vehicle .

    7. Object Number: 509352 Size: SH
  7. Install the coupling shield retainer and the lock nut.
  8. Hold the adjuster nut assembly in position to maintain alignment of the marks.

    9. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  9. Tighten the coupling shield retainer and the lock nut usingJ 43435 and a torque wrench.

    10. Tighten
    Tighten the coupling shield retainer and the lock nut (2) to 109 N·m (80 lb ft).

  10. Adjust the pitman shaft over center preload. Refer to Steering Gear Pitman Shaft Over-Center Preload Adjustment - Off Vehicle .
  11. Install the power steering gear. Refer to Steering Gear Replacement .