GM Service Manual Online
For 1990-2009 cars only

Disassembly Procedure


    Object Number: 429942  Size: SH
  1. Drain the power steering fluid from the power steering pump.
  2. Remove the pump mounting studs (2).
  3. Remove the connector and fitting assembly (4).
  4. Remove the O-ring seal (3) from the connector and fitting assembly (4).
  5. If replacement is required, remove the control valve assembly and the flow control spring from the pump housing assembly. Refer to Power Steering Pump Flow Control Valve Replacement - Off Vehicle.

  6. Object Number: 429946  Size: SH
  7. Remove the reservoir assembly (1) from the pump housing assembly (2).

  8. Object Number: 404947  Size: SH
  9. Remove the O-ring seals (1, 4 and 5).
  10. Remove the magnet (3).
  11. Clean the magnet (3).
  12. Inspect the welch plug in the power steering pump housing (2). Do not remove. If the welch plug is deformed or dislodged, replace the power steering pump.

Assembly Procedure


    Object Number: 404947  Size: SH

    Note: Use new O-ring seals when assembling the power steering pump assembly.

  1. Lubricate the O-ring seals (1, 4 and 5)  with power steering fluid.
  2. To install the control valve assembly and flow control spring to the pump housing assembly (2). Refer to  Power Steering Pump Flow Control Valve Replacement - Off Vehicle.
  3. Install the O-ring seals (1, 4 and 5) to the pump housing assembly (2).
  4. Install the magnet (3) to the pump housing assembly (2).

  5. Object Number: 429946  Size: SH
  6. Connect the reservoir assembly (1) to the pump housing assembly (2).
  7. Install the O-ring seal.
  8. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 429942  Size: SH
  9. Install the connector and fitting assembly (4) to the pump housing (1).
  10. Install the pump mounting studs (2) to the pump housing (1).
  11. • Tighten the pump mounting studs (2) to 58 N·m (43 lb ft).
    • Tighten the connector and fitting assembly (4) to 75 N·m (55 lb ft).