Adjustments to the manual steering gear are not necessary during normal service. Adjustments are performed only as part of overhaul.Worm Bearing Preload
- Mount the gear in a vise.
- Using an inch lbs. torque wrench and spanner KV48101400, or its equivalent, rotate the worm shaft a few turns in each direction to settle the bearing and measure the existing preload.
- If preload is not 1.7-5.2 inch lbs. on 1989 models or 6.1-7.8 inch lbs. 1990-95 models loosen the locknut and turn the adjusting plug with the spanner, in a clockwise rotation ONLY. Never adjust preload by turning the adjusting plug counterclockwise. If preload cannot be obtained in this manner, rebuild the gear.
- Apply liquid sealer on the shaft threads and tighten the locknut to 181-231 ft. lbs. (245-314 Nm) on 1989 models, or 166-188 ft. lbs. (226-255 Nm) on 1990-95 models.
REMOVAL & INSTALLATION
See Figure 1
- Raise and support the truck on jackstands.
- Unbolt the wormshaft pinch bolt at the rubber coupling.
- Matchmark the pitman arm and sector shaft, and with the wheels in a straight ahead position, remove the pitman arm with a puller.
- Unbolt and remove the gear from the frame.
- Install the gear and tighten the bolts to 62-71 ft. lbs. (84-96 Nm).
- Press the pitman arm onto the sector shaft so that the marks are aligned and then tighten the nut to 94-108 ft. lbs. (127-147 Nm) on 1989 models, or 174-195 ft. lbs. (235-265 Nm) on 1990-95 models.
- Slide the worm shaft into the coupling pinch bolt and tighten the bolt to 17-22 ft. lbs. (24-29 Nm).
See Figure 2
If assembly does not meet specifications-replace the steering gear with a complete unit.
- Carefully clamp the steering gear in a vise.
- Set the worm gear in the straight-ahead position.
- Remove the sector shaft with its cover. Be careful not to damage the oil seal when pulling the shaft out. If the needle bearing require replacement, replace the gear housing.