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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).
STEP
LOCATION
ITEM
ACTION
REMARKS
DISASSEMBLY (cont)
4
5
Spool (9) and
cap (11)
Body (5)
a. Spool (9)
Position and clamp In soft-jawed vise, with retaining ring (24)
facing upward
WARNING
Exercise care when removing retaining ring (24). There will be
spring tension against the spool cap (11). Failure to do so may
cause injury to your eyes by spool cap.
b. Retaining ring (24)
Expand and remove Use retaining ring pliers. Discard ring (24)
c. Spool cap (11) and
Lift and remove
From spool (9)
spring (25)
d. O-ring (26), U-cup
Remove and
From bore in spool cap(11 )
seal (27) and backup
discard
ring (28)
a. Backup ring (29),
Remove and
From bore in body (5)
U-cup seal (30)
discard
and O-ring (31)
b. Retaining ring
Remove
From breather hole in body (5)
(32) and filter (33)
CLEANING
WARNING
Dry cleaning solvent (P-D-680), used to clean parts is toxic and
flammable. Wear protective goggles and gloves and use only in a
well ventilated area. Avoid contact with skin, eyes, and clothes
and don’t breathe vapors. Do not use near open flame or exces-
sive heat and don’t smoke when using it. Failure to do so could
cause serious injury. If you become dizzy while using cleaning
solvent, get fresh air immediately, and get medical attention. If
contact with skin or clothes is made, flush with large amounts of
water. If contact with eyes is made, wash eyes with water immedi-
ately, and obtain medical aid immediately.
WARNING
Wear safety glasses when drying parts with compressed air. Fail-
ure to do so could cause serious injury to eyes and possible blind-
ness. If you hurt your eyes or if a foreign object is blown into
your eyes, seek medical attention immediately.
2-305
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