Steering Mode Selector Valve

TM 10-3930-242-34

( 1 2 ) Insert the valve (13), spring (12), and

(4) Remove the packing (19) from the cover

plug (11) into the cover (14).

(14).

(13) Install the elbows (15) and (17) into the

(5) Lift off the cover (22) from the body (4).

cover and install the plug (18) in the elbow (17).

(6) Remove the packing (23) from the body

f. Installation. Install the rear steering pump

(4).

(TM 10-3930-242-12).

(7) Remove the rotor (9) and vanes (10).

(8) Remove the key (25) from the shaft (24).

5-18. Steering Mode Selector Valve

(9) Remove the shaft (24), bearing (7), and

a. Removal.

ring (8) from the body (4) as an assembly, then

(1) Access is through the steering com-

remove the ring (8) from the shaft.

p a r t m e n t door beneath the operator compart-

(10) Press the bearing (7) from the shaft (24).

ment.

(11) Remove the elbows (15) and (17) and the

(2) Refer to figure 5-16 and remove the

plug (18).

s t e e r i n g mode selector valve.

( 1 2 ) Remove the plug (11), spring (12), and

NOTE

valve (13) from the cover (14).

Tag all hydraulic lines before removal.

d. Cleaning a n d I n s p e c t i o n .

( 1 ) Clean all parts thoroughly, using sol-

b. Disassembly. Refer to figure 5-17 and dis-

v e n t P-D-680 or similar solvent. Dry all parts

a s s e m b l e the steering mode selector valve.

thoroughly.

c. Cleaning and Inspection.

( 2 ) Inspect the body, the cover in contact

(1) Clean all parts thoroughly, using clean

w i t h the rotor, and the rotor for scored areas.

s o l v e n t P-D-680, or equal.

( 3 ) Inspect the bearing for smoothness.

( 2 ) Inspect the components for scored or

( 4 ) Inspect the shaft for wear at the point

w o r n areas, burrs, scratches, or other defects.

w h e r e the seal contacts.

( 3 ) Replace all defective parts.

( 5 ) Inspect all parts for excessive wear or

d. Reassembly. Refer to figure 517 and reas-

w h a t can be determined as a damaged condi-

s e m b l e the steering mode selective valve.

tion.

e. Installation. Refer to figure 5-16 and in-

( 6 ) Replace all defective parts.

s t a l l the steering mode selector valve.

e. Reassembly.

519. Steering Gear Assembly

( 1 ) Press the bearing (7, fig. 5-15) on the

a. General.

shaft (24) and secure with the ring (8).

( 2 ) Install the assembled shaft and bearing

(1) When the cam is turned to the left or

in the body (4).

right by the operator's effort in turning the

s t e e r i n g wheel, the stud of the inner lever is

(3) Install a new seal (2) and secure with the

m o v e d through the groove of the cam (worm),

r i n g (l). Install the seal with the lip facing in-

t h u s rotating the lever shaft and providing an-

ward.

gular movement of the steering gear pitman

(4) Install a new packing (23) in the face of

arm. Whenever the operator's effort at the

the body (4).

s t e e r i n g wheel exceeds the preload of the cen-

(5) Install the key (25) in the shaft (24) and

tering springs and "hydraulic reaction," the

install the rotor (9) on the shaft.

control valve is actuated and the hydraulic

(6) Position the cover (22) in position on the

power is applied to provide the driver with

body (4) and over the installed rotor.

p o w e r steering. The action of the steering sys-

( 7 ) Insert the vanes (10) into their slots in

the rotor.

tem is hydraulic with mechanical follow up. The

(8) Install a new packing (19) in the face of

p i t m a n arm is splined to the main steering gear

l e v e r shaft and provides required feedback to

the cover (14).

(9) Position the spring (20) in position on the

the operator giving some "road feel" and a

s t e e r i n g reference point. Mechanical disadvan-

c o v e r (21) and insert the assembled cover (21)

tage is such that manual steering is not feasible.

a n d spring (20) into their position in the cover

The engine must be running to provide hyd-

(14).

raulic pressure for the steering system. To force

(10) Hold the assembled cover components

t h e steering system (with the engine not run-

t o g e t h e r and position the cover onto the cover

n i n g ) may result in damage to the system. This

( 2 2 ) with it and the assembled components in

s t e e r i n g system incorporates a hydraulic con-

the body (4).

trol valve on a single stud cam and lever

( 1 1 ) Secure the complete assembly together

m e c h a n i c a l steering gear.

with the screws (16).

5-32