Pickup 4WD V6-2972cc 3.0L SOHC (1991)
10.
Using tool No. MB990853 or equivalent and a spring scale, tighten top cover to a force of 14-19 lbs., then loosen top cover completely. Rotate
input worm shaft and check for smooth operation.
11.
Measure starting torque using tool No. MB990228 or equivalent, while turning input worm shaft, and note the value.
12.
Tighten top cover until starting torque of input worm shaft is 1.8-2.7 inch lbs., more than value measured in step 11.
13.
Install valve housing nut, then torque to 131-166 ft. lbs.
14.
Remeasure starting torque while turning input worm shaft. Preload should measure 2-6 inch lbs. If not, loosen valve housing nut and repeat steps
10 through 12.
15.
Secure gear housing in a vise, then install screw unit.
16.
Install valve housing attaching bolts, then torque to 33-39 ft. lbs. Rotate input worm shaft to move rack piston to the Neutral position.
17.
Install cross shaft with side cover to gear housing. Torque attaching bolts to 33-39 ft. lbs. When installing cross shaft assembly, take the following
precautions:
a. Apply thin coat of Dexron II to rack piston teeth and shaft.
b. Apply multi-purpose grease to lip of oil seal.
c. Do not rotate side cover when installing, to prevent damage to O-ring.
d. Wrap the serration of cross shaft with vinyl tape, then install it carefully to avoid damaging the seal.
18.
Measure total starting torque of input worm shaft, in the Neutral position, and adjust as necessary to 4-8 inch lbs. Ensure screw unit operates
smoothly throughout its entire range.
19.
Connect cross shaft to pitman arm. Ensure slit on tip of shaft is aligned with mark on pitman arm and torque retaining nut to 94-108 ft. lbs.