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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).
REMARKS
ITEM
ACTION
STEP
LOCATION
REASSEMBLY/REPAIR (cont)
15
Install
Carefully push onto spool (9); then push
p. Gland (2)
(cont)
gland down against pressure of spring
(14) and screw several turns into body (5)
Push down
q. Spool (9)
To verify that spool cap (11) moves
smoothly through bore
r. Gland (2)
Tighten
Use spanner wrench or chain wrench
s. Rubber cover (1)
Install
Push large end of cover onto groove around
outside of gland (2)
t. Body (5)
Remove
From vise
INSTALLATION/REPLACEMENT
16
Install
a. Push rod (7)
Front chassis,
Screw clockwise onto yoke (8)
bottom left
side
b. Power assist unit
Position
Slide rubber cover (1) over push rod (7).
Position bracket, with hydraulic ports in
body facing down
Install through
Until power assist unit is securely mounted
c. Four lock washers
(4) and cap screws
bracket and
tighten
(3)
d. Hydraulic lines and
Connect to
fittings
ports on body
(5) and tighten
e. Brake master cylinder
Install
f. Brake pedal
Adjust free travel
g. Power assist unit
Test relief
Para 2-41, MALFUNCTION 8, step 7
pressure
h. Brake pedal
Depress
With engine running. Check for proper
brake operation
2-309
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