STEERING GEAR VALVE INSTALLATION.

TM 10-3930-623-34

4. Lubricate valve spool (72) with OE-10 engine oil.

2. Rotate stub shaft (76) until sector gearshaft (37)

Slide spool over stub shaft (76) with notch toward valve

is in center position and remove side cover retaining

body. Align notch with spool drive pin (69) in stub shaft

screws (28). Tap end of gearshaft with soft mallet and

and carefully engage spool in valve body bore. Push

slide gearshaft out of housing.

spool evenly and slowly with a slight oscillating motion

3. Remove side cover packing (31) from side cover

until spool reaches drive pin. Rotate spool slowly with

and discard.

pressure until notch engages pin. Before pushing spool

completely in, make sure dampener packing is evenly

6-78.

SECTOR GEARSHAFT AND SIDE COVER

distributed in the spool groove. Slowly push spool

DISASSEMBLY.

completely in. Take extreme care not to cut or pinch

packing.

1. Hold lash adjuster (33, figure 4-32) with a hex

key wrench and remove lash adjuster nut (34). Screw

lash adjuster out of side cover (30).

CAUTION

2. Remove sector gearshaft seal retaining ring

Because of close tolerance between

(39), and then remove outer back-up washer (40). Tap a

the spool and valve body, extreme

screwdriver between the outer seal (41) and inner back-

care must be taken when assembling

up washer and pry out seal. Tap screwdriver between

these parts.

inner seal (42) and shoulder of gear housing (87) and

5. Place seal protecting tool over stub shaft. Slide

pry out seal. Be careful not to damage seal bore.

spool spring (70) over seal protector and work spool

Discard seals.

spring down until it is seated in stub shaft groove. Take

3. Remove needle bearing (82) from gear housing

care not to mar sealing surface of stub shaft (76).

bore by pressing on stamped identification end of

6. Lubricate a new cap-to-worm packing (80) with

bearing. Discard bearing.

OE-10 engine oil, and install in valve assembly.

7. If during assembly of valve, the stub shaft and

6-79 SECTOR

GEARSHAFT

AND

SIDE

COVER

cap assembly is allowed to slip out of engagement with

INSPECTION.

the valve body pin, the spool may enter the valve body

too far. The dampener packing will expand into the

1. Inspect sleeve bearing (29, figure 4-32) in side

valve body oil grooves, preventing withdrawal of spool.

cover (30) for excessive wear or scoring. If badly worn

Attempt to withdraw the spool with slight pulling and

or scored, replace the side cover and bearing as an

much rotary motion. If this does not free the spool after

assembly.

several tries, make sure spool is free to rotate; place

2. Check sector gearshaft teeth and bearing and

valve body on flat surface with notched end up, and tap

seal surfaces. If badly worn, pitted, or scored, replace

spool with wooden or plastic rod until packing is cut and

the gearshaft assembly.

spool can be removed. Replace packing and proceed

3. Check needle bearing (82) in housing (87).

with assembly as before.

6-80.

SECTOR GEARSHAFT AND SIDE COVER

6-76. STEERING GEAR VALVE INSTALLATION.

ASSEMBLY.

1. Align valve body drive pin in worm (59), figure 4-

1. Press needle bearing (82, figure 4-32) into the

32) with narrow pin slot on valve body (75). Insert valve

gear housing (87) from steering arm end, pressing

assembly into gear housing (87). Do not push against

against stamped identification end of bearing. Press in

stub shaft as this may cause stub shaft and cap to pull

until bearing clears shoulder in gear housing 0.030 inch

out of the valve body, allowing spool seal to slip into

maximum.

valve body oil grooves. Valve assembly should be

2. Lubricate new gearshaft seals in OE-10 engine

pushed in by pressing against valve body with finger

oil. Install single lip seal (42) first, then a back-up

tips. Be sure valve is properly seated before assembling

washer (40). Drive seal and washer in far enough to

adjuster plug assembly. Return hole in gear housing

provide clearance for the other seal, and back-up

(87) should be fully visible at this time.

washer, and retaining ring. Seal must not bottom on end

2. Install adjuster plug (52) assembly as outlined in

of counterbore. Install double lip seal (41) and second

paragraph 6-70.

back-up washer. Drive seal and back-up washer in only

far enough to provide clearance for the retaining ring.

Install sector gearshaft retaining ring (39), making

6-77.

SECTOR GEARSHAFT AND SIDE COVER

certain that ring is seated properly.

REMOVAL.

3. Assemble side cover (30) and bearing (29)

1. Remove nut (27, figure 4-32) securing steering

assembly to sector gearshaft assembly. Screw lash

lever (26). Using puller, remove lever.

adjuster (33) through side cover until side cover bottoms

on the gearshaft, and back off 1/2 turn.

6-20