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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 >> Pitman Shaft Over-Center Preload Adjustment - Off Vehicle >> Pitman Shaft Over Center Preload Adjustment

Pitman Shaft Over Center Preload Adjustment

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. Loosen the lash adjuster lock nut.
    Fig 1: Loosening The Lash Adjuster Lock Nut
    GM1501450Courtesy of GENERAL MOTORS CORP.
  2. Turn the pitman shaft adjuster screw counterclockwise until fully extended.
  3. Turn the pitman shaft adjuster screw clockwise 1 full turn.
  4. Rotate the stub shaft from stop to stop, using 12-point socket while counting the number of turns.
  5. Starting at either stop, turn the stub shaft back half the total number of turns. This is the CENTER of the gear.
  6. Make sure the gear is centered by checking the following items:
    • The flat on the stub shaft (2) faces upward.
    • The flat on the stub shaft is parallel with the side cover.
    • The master spline (3) on the pitman shaft is in line with the adjuster screw (1).
    Fig 2: Centering Steering Gear Stub Shaft
    GM1501452Courtesy of GENERAL MOTORS CORP.
  7. Place a torque wrench on the stub shaft with the handle in the vertical position.
  8. Rotate the stub shaft 45 degrees from each side of the center of the stub shaft. The stub shaft must rotate smoothly and must not stick or bind.
    Fig 3: Rotating The Stub Shaft 45 Degrees From Each Side Of The Center Of The Stub Shaft
    GM1501453Courtesy of GENERAL MOTORS CORP.
  9. Record the worm bearing preload measured on or near the center.
  10. Recorded bearing preload must be 0.7-1.7 N.m (6-15 lb in), with the worm and the ball nut installed. If the torque is outside this range, readjust or repair the steering gear assembly as required.
  11. To obtain the correct preload torque, adjust the over center torque by turning the pitman shaft adjuster screw clockwise.
  12. Add 0.7-1.1 N.m (6-10 lb in) torque to the previously measured worm bearing preload torque.
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