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TM 10-3930-638-24&P
2-43. SERVICE BRAKE MAINTENANCE (cont)
c. Hydraulic Brake Valve (cont)
(2) Power Assist Unit (cont).
15
STEP
LOCATION
ITEM
ACTION
REMARKS
REASSEMBLY/REPAIR (cont)
d. Shim(s) (18)
Install
If used, slide over narrow end of poppet
(cont)
onto shoulder
e. Spring (17)
Install
On poppet (19)
f. O-ring (16)
Install
Over threaded end of plug (15)
g. End plug (15)
Install and tighten Push over spring (17) and turn clockwise
until securely mounted to body (5)
h. Body (5)
Reposition and
In vise, with gland end facing up
clamp
i. Spring (14) and
Install
In body bore
retainer (13)
j. Piston ring (12)
Install on piston
Use piston ring pliers
(10)
k. Spool (9)
Lubricate
Lightly coat piston end of spool with
hydraulic oil
l. Piston (10)
Install as shown
m. Piston (10) and
Lubricate
Lightly coat outer surface with hydraulic
piston ring (12)
oil
n. Spool cap (11),
Install
Position spool cap (11) into bore of body;
spool (9) and
then lower spool, cap and piston assembly
piston (10)
onto spring (14)
o. O-ring (20) and
Lubricate
Lightly coat with hydraulic oil
U-cup seals (22
and 30)
CAUTION
Exercise care so as not to damage U-cup seals (22 and 30) when
installing gland (2).
2-308
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