TM 1-1520-238-23
3-251
3.63.
BRAKE CONTROL VALVES INTERNAL LEAKAGE REPAIR AND TEST (AVIM) – continued
WARNING
Piston is spring loaded. Remove cap
carefully to prevent injury to person-
nel. If injury occurs, seek medical aid.
b. Disassemble piston (6).
(1) Hold piston (6). Remove hydraulic valve cap
(8).
(2) Remove disk (10), valve poppet (9), and com-
pressed helical spring (11) from piston (6).
(3) Discard disk (10).
c. Remove hydraulic bleeder valve (12) from
valve (2).
(1) Hold valve (12). Remove screw (13) and lock
washer (14).
(2) Remove bleeder valve (12) from valve (2).
3.63.4. Cleaning
a. Clean valve and valve components (para 1.47).
3.63.5. Inspection
a. Check poppet seating surface on cap for
nicks and scratches. None allowed.
b. Check that diameter of piston is not less than
1.497 INCHES and piston bore is not more
than 0.406 INCHES. Use caliper set and small
hole gage.
c. Check spring (5) and spring (11) for free
length, compressed length, and load with
spring tester (Table I). Use spring tester.
d. Check piston and valve for corrosion (para
1.49).
GO TO NEXT PAGE
8
9
11
10
6
M04-2949-2
2
M04-2949-3
13
14
12
M04-2949-5
FREE LENGTH
11
11
SPRING
TESTER
M04-2949-4
FREE LENGTH
5
5
SPRING
TESTER
