STEERING GEAR VALVE REMOVAL.

TM 10-3930-623-34

5. Remove dampener seal packing (71) from spool

NOTE

and discard.

It is uncommon to make service

repairs to the valve assembly, with

6. Where the valve PACKINGS (74) show

the exception of the valve spool

evidence of excessive wear cut them, and rings (73),

dampener packing.

remove and discard. The valve rings are made of filled

teflon and it is very unusual that replacement is required.

6-72. STEERING GEAR VALVE REMOVAL.

1. Remove adjuster plug assembly as outlined

6-74. STEERING GEAR VALVE INSPECTION.

under paragraph 6-70.

1. If the valve assembly leaks externally around the

2. Remove valve assembly from gear by grasping

torsion bar (79, figure 4-32) replace the entire assembly.

stub shaft (76, figure 4-32) and pulling out valve

assembly and stub shaft.

2. Check the pin in the valve body (75) which

engages the cap. If it is badly damaged, replace the

entire valve assembly.

6-73. STEERING GEAR VALVE DISASSEMBLY.

1. Remove packing (80, figure 4-32) and discard.

3. Check the worm pin groove (the smaller of the

two) in the valve body. If it is damaged, replace the

2. Remove spool spring (70) by prying small coil,

entire valve assembly.

using small screwdriver. Do not pry against valve body

(75) as this may result in a sticky valve. Work spring

4. Check the spool dri ve pin in the stub shaft (76).

onto bearing diameter of stub shaft (76). Slide spring off

If it is worn badly, cracked, or broken, replace the entire

the stub shaft.

valve assembly.

3. Remove valve spool (72) with extreme care. To

5. Examine the spool (72) surface for nicks and

remove valve spool, hold valve assembly in both hands

burrs. If any are found, they may be removed with a

with stub shaft pointing downward. Push lightly on valve

very fine hone. A slight polishing is normal on the

spool with a small rod inserted through openings in valve

valving surfaces.

cap (79) until spool is far enough out of valve that it may

be jasped by hand. Withdraw spool with a steady

6. Examine the valve body bore for nicks or burrs.

oscillating pull to prevent jamming. If slight sticking

If any are found, they can be removed with light crocus

occurs, make a gentle attempt to reverse withdrawal

cloth until the spool turns freely min the body. Be careful

procedure. If this does not free the spool, it has become

not to remove any stock from the surface of the body.

cocked in the valve body bore. Do not attempt to force

As on the spool, a slight polishing is normal on the

spool in or out if it becomes cocked. in this case,

valving surfaces.

continue to disassemble valve assembly as follows and

return to the spool as described below.

6-75. STEERING GEAR VALVE ASSEMBLY.

1. Lubricate three valve packings (74, figure 4-32)

CAUTION

in OE-10 engine oil. Assemble in grooves of valve body

The maximum clearance between the

(75) Assemble valve packings (74) min ring grooves

valve body and the spool may be as

over back-up rings (73) by carefully slipping the rings

low as 0.0004 inch. The slightest

over valve body. The rings may appear loose or twisted

cocking of the spool may jam it in the

in grooves, but the heat of the oil after assembly will

valve body.

cause them to tighten.

4. Remove stub shaft (76), torsion bar and valve

cap (79) assembly by holding the valve assembly in both

2. Install new valve spool dampener packing (71)

hands as before, only with thumbs on valve body. Rap

in valve spool (72) groove.

torsion bar lightly against the work bench. This will

dislodge the cap from the valve body. The valve spool

3. Assemble the stub shaft (76) in the valve body

has become cocked as described above, it can now be

(75). Align groove in valve cap (79) with pin in valve

freed. By visual inspection on a flat surface it can be

body. Tap lightly on cap with plastic or rawhide mallet

determined in which direction the spool is cocked. A few

until cap is against shoulder in valve body with valve

very light taps with a light soft plastic or rawhide mallet

body pin in cap groove.

should align the spool in the bore and free it.

CAUTION

Make sure groove and pin are in line

Do not tap with anything metallic. If

before tapping on cap. Hold these

spool can be rotated, it can be

parts together during the rest of the

removed.

assembly.

6-19