The power steering in these vehicles employed a manual steering gear, with power assist. Removal and installation procedures are the same as those for the manual steering gear above, with the exception of the need to disconnect and reconnect the fluid lines.
The adjustments are identical to those performed on the manual steering gear except that the worm gear preload is 5 in. lb.
WORM BEARING PRELOAD
See Figures 1, 2 and 3
- Remove the gear and place in on a clean workbench.
- Remove the adjuster plug locknut. Seat the adjuster plug firmly by applying about 20 ft. lb. of torque.
- Place an index mark on the gear housing, opposite one of the adjuster plug holes.
- Going counterclockwise, make another mark 1 / 2 in. from the first mark.
- Turn the adjuster plug counterclockwise until the hole, which was aligned with the first mark, is now aligned with the second mark.
- Install the adjuster plug locknut and torque it to 85 ft. lb., making certain that the adjuster plug does not move.
- Turn the stub shaft clockwise to its stop, then turn it back 1 / 4 turn.
- Using an inch pound (in. lb.) torque wrench with a 50 in. lb. scale and a 12 point deep socket on the stub shaft, take a reading of effort when the beam of the torque wrench passes the vertical point while turning. Torque at this point must be 4-10 in. lb. If the reading is not correct, the adjuster plug is either not set correctly or moved while tightening the locknut, or, there is internal damage in the gear.
See Figures 4, 5, 6 and 7
- Turn the pitman shaft adjuster screw counterclockwise until it is fully extended, then, turn it back 1 full turn.
- Rotate the stub shaft from stop to stop, counting the total number of full turns, then, turn it back 1 / 2 the number of full turns. This is the center point of its travel. When the gear is centered, the flat on the stub shaft should face upward and be parallel with the side cover. The master spline on the pitman shaft should be aligned with the adjuster screw.
- Place an inch pound (in. lb.) torque wrench with a 50 in. lb. scale, and a 12 point deep socket, on the stub shaft, with the torque wrench beam in the vertical position.
- Rotate the torque wrench 45º to each side of center and note the highest torque reading on or near the center point. Adjust the drag torque, by turning the adjusting screw clockwise, to the following values:
- When adjustment is complete, tighten the locknut to 20 ft. lb.
- Install the gear in the truck.
See the procedures for manual steering gear.