Removal. - TM-10-3930-627-340087

visual inspection on a flat surface it can be determined

damaging it. If the valve spool dampener packing

in which direction the spool is cocked. A few very light

requires replacement, remove valve spool only,

taps with a light soft plastic or rawhide mallet should

replacing packing, and reinstall spool immediately. Do

align the spool in the bore and free it.

not disassemble further.

(e) Remove dampener seal packing (11) from

Note. It is very uncommon to have to

spool and discard.

make any service repairs to the

(f) Providing the rings show evidence of

valve, with the exception of the valve

excessive wear, carefully cut valve rings (22) and ring

spool dampener parking.

back-up packing (23), remove and discard. The valve

(2) Removal.

rings are made of filled teflon and it is very unusual that

(a) Remove adjuster plug as outlined under

replacement is required.

a. above.

(4) In-process inspection.

(b) Remove valve from gear by grasping stub

(a) If the valve leaks externally around the

shaft (20, fig. 11-2) and pulling out valve and stub shaft.

torsion bar (19) replace the entire assembly.

(3) Disassembly.

(b) Check the pin in the valve body (21)

(a) Remove packing (18) and discard.

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

(b) Remove spool spring (58) by prying small

the entire valve assembly.

coil, using small screwdriver. Do not pry against the

valve body (21) as this may result in a sticky valve.

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

Work spring onto bearing diameter of the stub shaft

the entire valve assembly.

(20). Slide the spring off the stub shaft.

(d) Check the spool drive pin in the stub shaft

(20). If it is worn badly, cracked, or broken, replace the

care.

entire valve assembly.

Caution: The clearance between the

(e) Examine the spool (57) surface for nicks

valve body and the spool may be as

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

low as 0.0004 inch. The slightest

a very fine hone. A slight polishing is normal on the

cocking of the spool may jam it in

valving surfaces.

the valve body. To remove valve

(f) Examine the valve body bore for nicks or

spool (57), hold valve assembly in

burrs. If any are found, they can be removed with light

both hands with stub shaft pointing

crocus cloth until the spool turns freely in the body. Be

downward. Push lightly on valve

careful not to remove any stock from the surface of the

spool with a small rod by inserting

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

rod through openings in valve cap

the valving surfaces.

(19) until spool is far enough out of

(5) Assembly.

valve that it may be grasped by the

(a) Lubricate three valve ring back-up

hand. Withdraw spool with a steady

packings (23) in automatic transmission fluid, Type "A".

oscillating pull to prevent jamming.

Assemble in three ring grooves on the valve body (21).

If slight sticking occurs, make a

Assemble the valve rings (22) in the ring grooves over

gentle attempt to reverse withdrawal

the back-up packings by carefully slipping the rings over

procedure. If this does not free the

the valve body. The rings may appear loose or twisted

spool, it has become cocked in the

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

valve body bore. Do not attempt to

cause them to tighten.

force the spool in or out if it

(b) Install new valve spool dampener packing

becomes cocked.

In this case,

(11) in valve spool (57) groove.

continue to dis-assemble the valve

assembly as follows and return to

body. Align groove in valve cap (19) with pin in valve

body. Make sure groove and pin are in line before

the spool as described in step ( d)

tapping on cap. Hold these parts together during the

below.

rest of the assembly. Tap lightly on cap with plastic or

(d) Do not tap with anything metallic. If spool

rawhide mallet until cap is against shoulder in valve

can be rotated it can be removed. Remove the stub

body with valve body pin in cap groove.

shaft (20), torsion bar and valve cap assembly (19) by

Caution: Because the clearance

holding the above assembly in both hands as before,

between the spool and the valve

only with thumbs on valve body. Rap torsion bar lightly

body is very small, extreme care

against the work bench. This will dislodge the cap from

the valve body to cap pin. The stub shaft, torsion bar

must be taken when assembling

and valve cap assembly can now be removed from the

these parts.

valve body. If the valve spool has become cocked as

described in step (c) above, it can now be freed. By

11-4