Mazda Trucks 1972-1986 Repair Guide

Power Steering Gear


ADJUSTMENT Wormshaft Preload

See Figures 1 and 2

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Fig. Fig. 1: Power steering gear preload adjustment

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Fig. Fig. 2: Measuring power steering gear preload

  1. With the steering gear mounted in a vise, and the Pitman are positioned in a "wheels straight ahead" position, attach a spring scale and adapter 49 0180 510B to the wormshaft.
  3. Check the rotating torque of the wormshaft. Rotating torque should be 2.2 lbs. or less and at least 1 / 2 to 1 lb. higher than what the rotating torque is at a point 360º from straight ahead.
  5. If preload is not correct, hold the adjusting screw on top of the gear with a screwdriver and loosen the locknut. Turn the adjusting screw to obtain the correct preload.
  7. When preload is correct, hold the adjusting screw and tighten the locknut to 35 ft. lbs. Make sure that the adjusting screw does not move while the locknut is being tightened.


  1. Raise and support the front end on jackstands.
  3. Disconnect the pressure and return lines at the gear box. Have a drain pan underneath to catch the fluid.
  5. Remove the pinch bolt securing the wormshaft to the steering shaft coupling.
  7. Remove the cotter pin and nut securing the Pitman arm to the center link and separate the Pitman arm from the link with a ball joint tool.
  9. Unbolt the steering gear from the frame.
  11. If the Pitman arm is to be removed from the sector shaft, first matchmark their positions, relative to each other.
  13. Installation is the reverse of removal. Observe the following torques:

    Pressure line: 26 ft. lbs.
    Return line: 35 ft. lbs.
    Steering gear-to-frame: 40 ft. lbs.
    Wormshaft-to-steering shaft yoke: 28 ft. lbs.
    Pitman arm-to-sector shaft: 139 ft. lbs.
    Pitman arm-to-center link: 30 ft. lbs.