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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 802 (POWER STEERING SYSTEM)REPAIR INSTRUCTIONSSTEERING GEAR VALVE REPLACEMENT - OFF VEHICLEASSEMBLY PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Assembly Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Assembly Procedure
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. If disassembled, reassemble the valve assembly in the following manner:
    1. 1.1.  Alternately install the valve body teflon rings (5) and the O-ring seals (4).
    2. 1.2.  Install the valve spool O-ring seal (2) to the valve spool (1).
    3. 1.3.  Lubricate the valve spool (1) and O-ring seal (2) with power steering fluid.
    Fig 1: Installing Steering Gear Valve
    G01662208Courtesy of GENERAL MOTORS CORP.
  2. Simultaneously push and rotate the valve spool (2) into the valve body (1) until the hole (3) in the valve spool (2) for the stub shaft pin is accessible from the opposite end of the valve body (1).
    Fig 2: Identifying Valve Spool, Valve Body & Hole
    G01662209Courtesy of GENERAL MOTORS CORP.
  3. If necessary, install the stub shaft to the valve spool in the following manner:

    Lubricate the stub shaft assembly (3).

    1. 3.1.  Insert the stub shaft (3) into the valve spool.
    2. 3.2.  Insert the pin.

      Important:  Make sure that the shaft cap notch (1) is mated with the valve body pin before installing the valve body into the steering gear assembly.

    3. 3.3.  The notch in the cap (1) must fully engage the valve body pin (2). Seat the cap against the valve body shoulder.
    Fig 3: Installing Stub Shaft To Valve Spool
    G01662210Courtesy of GENERAL MOTORS CORP.
  4. Install the stub shaft (7) and valve assembly (6) to the worm shaft (5). Ensure the pin fits in the worm shaft to the slot in the valve assembly.
  5. Install the thrust support assembly. Refer to Steering Gear Thrust Support Replacement - Off Vehicle .
    Fig 4: Installing Stub Shaft & Valve Assembly
    G01662211Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.