gripping with a downward pressure and turning coun-
(2) Use a suitable puller and remove the steering
wheel (TM 10-3930-634-12).
(3) Use a suitable puller and remove the steering
pitman arm from the steering gear lever shaft.
(4) Tag and disconnect hydraulic lines as neces-
sary. Place dust caps over openings to prevent foreign
matter from entering the hydraulic system.
(5) Remove column from upper support bracket.
(6) Remove mounting flange bolts and remove
gear from chassis.
c. Disassembly. Refer to figure 5-19 and disassem-
ble the steering gear assembly.
d. Cleaning and Inspection.
(1) Clean all parts thoroughly, using solvent
P-D-680, or equal.
(2) Inspect the components for wear, burrs, scored
areas and other damage.
(3) Replace all defective parts.
e. Reassembly. Refer to figure 5-19 and reassemble
the steering gear assembly.
f. Installation. Install the steering gear assembly in
the reverse order of removal.
g. Thrust Bearing Adjustment Procedure.
(1) Remove capacrews (36, fig. 5-19) holding up-
per cover (38) and remove cover and jacket tube assem-
(2) Reassemble screws in actuator housing (50),
using 3/8-inch thick spacers under the head of the
screws. This is to hold the actuator (46) and cam as-
sembly (70) in the gear when making the adjustment.
(3) Straighten prong of lockwasher (41). Remove
ahead driving conditions, the centering springs in the
nut (40), tongued washer (42), upper thrust washer
actuator assist in giving the system road feel. The feel
(43) and bearing (44).
and steering effort created by the springs is constant
(4) Insure that the threads of the nut and cam
for any steering condition and is tailored to suit the
shaft are free of interference by running the nut onto
vehicle application by changing the spring load to give
the cam shaft by using only the fingers to turn the nut.
the degree of steering effort desired.
If the nut cannot be tightened in this manner, use of a
(4) Whenever the operator's efforts at the steering
thread file or other means will be necessary to correct
wheel overcome the centering effect of the springs, the
this fault until the nut goes on freely.
valve spool is moved axially, restricting one of the re-
(5) Reassemble thrust washers, bearings, tongued
turn passages to the outlet port. This causes an imme-
washers (with internal lug), pronged washer (with 13
diate increase in pressure at one of the cylinder ports
external prongs), and nut.
and in one end of the cylinder. At the same time, the
(6) Tighten nut to 10 lb-ft torque then back off
other return passage is enlarged, allowing the oil from
nut 10-20 degrees which can be done by moving the
the discharging end of the cylinder free passage to the
nut approximately the width of one and one-half lugs.
outlet port and return to the reservoir. The immediate
Bend the lug, nearest alinement, with a notch in the
effect is increased pressure in one end of the cylinder
nut into a notch root on the nut.
to actuate the piston which applies hydraulic power di-
(7) Reassemble upper cover and jacket tube as-
rectly to the steering gear pitman arm or linkage part
sembly and attaching parts.
to which the cylinder is attached. Full pressure is ob-
tained with a spool travel of about sixty-five one-thou-
5-20. Rear Power Steering Valve
sandths of an inch. The slightest movement results in
a pressure differential.
a. Removal. Tag and disconnect the hydraulic hoses
from the rear power steering valve (fig. 5-20). Meas-
(1) Remove the cover from the steering wheel by
ure and record the length of the valve link before re-