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TM 10-3930-638-24&P
4-4. TRANSMISSION MAINTENANCE (cont)
k. Modulation Valve Assembly (cont).
REMARKS
ITEM
ACTION
STEP
LOCATION
DISASSEMBLY
a. Four piston seals (1)
1 Modulation
Remove
valve body (8)
b. Four O-rings (2)
Remove and
discard
c. Two accumulator
Remove
valves (3)
d. Two outer accumu-
Remove
lator springs (4)
e. Two inner accumu-
Remove
lator springs (5)
f. Two regulator
Remove
springs (6)
g. Two regulator
Remove
spools (7)
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
AH parts
Clean
Use cleaning solvent P-D-680. Immerse
parts in cleaning solvent and move slowly
up and down until parts are thoroughly
cleaned. Dry parts thoroughly using com-
pressed air or clean cloths
INSPECTION
3
Modulation valve
Inspect
Replace if worn, damaged or distorted, or
body (8)
if spool bores cracked or worn
4-235

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