TM 5-3810-295-34
17-10. Steering Gear Adjustments
The steering gear assembly is designed to provide ad-
ings, pitman shaft, and mating parts. See figure 17-5
justment to compensate for normal wear at worm bear-
for adjustment points.
Figure 17-5. Steering gear and adjustment points.
NOTE
Worm gear preload adjustment must be
(1) Count the number of turns required to rotate
checked and adjusted if necessary before
the worm gear from one stop to the other. Starting at
making pitman preload adjustment.
one stop rotate worm gear, exactly one-half the total
a. Disconnect drag link from pitman arm. Relative
revolutions, to the center position. Mark the input shaft
positions of linkage and pitman arm shall be noted as
and the housing, establishing a center position reference
parts must be reassembled in the same relative position.
point.
b. Proper adjustment of worm bearings is obtained
(2) Turn the last adjuster screw clockwise to
by ;including or removing shims between steering gear
remove all backlash between gear teeth.
Tighten
housing and top cover or end cover (fig. 17-5). Shims
adjuster screw lock nut to 255 ft-lb (33.94R N. m) torque.
are available in thickness of 0.002 inch, 0.005 inch, and
(3) Using a 12-point socket and an inch-pound
(.030 inch.
torque wrench measure the highest torque required to
(1) When steering gear box has been assembled
move the input shaft through the center position. Torque
per paragraph 17-13a. loosen lash adjuster lock nut (fig.
must be 8-12 in-lb (.90-1.4 N- m) in excess of the worm
17-5) and turn lash adjuster a few turns counter
bearing preload, but not to exceed 30 in-lb (3.39 No m).
clockwise to relieve the load from the worm bearing and
(4) If above requirements are not met repeat (2)
to provide clearance between the sector gear (10, fig.
and (3) above until torque reading is within specification.
17-7) and the worm ball nut (29).
Always recheck torque reading of input shaft after lock
(2) Carefully rotate the worm shaft (21) all the
nut has been tightened.
way to one stop and then back off one full turn. With a
(5) Loosen lock nut on back-up adjuster (fig. 17-
12-point socket on splined end of shaft and an inch
5), turn adjuster in until it bottoms, then back it out one-
pound torque wrench, measure amount of torque
eighth to one-fourth turn and tighten lock nut.
required to maintain shaft movement. Torque reading
d. After all adjustments have been made install
shall 1be 14-18 in-lb (1.58--2.03 N. m). If torque does
steering box in the vehicle frame. Install the pitman arm
not meet this requirement, add or remove shims as
on the pitman shaft (10, fig. 17-7) aligning it with the
required.
reference marks established at time of disassembly.
c. Adjust the pitman shaft lash as described in the
following:
17-8
