TM 55-1520-240-23-6
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TEST BRAKE MASTER CYLINDER (AVIM)
(Continued)
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46.
Open shutoff valve (11). Apply 3000 psi to
PRESS port (5).
47.
Attach 25 pound (19) weight to handle (8).
48.
Position graduate (20) under RETURN port (7).
49.
After 1 minute, check RETURN port (7) for
leaks. Leaks shall not exceed 32 cc per minute.
50.
Check pressure gage (21) for 2 minutes. Gage
shall read 320 to 575 psi. Pressure reading shall
not vary more than 30 psi during 2 minutes.
51.
Remove 25 pound (19) weight from handle (8).
52.
With aid of helper, attach 94 pound weight (22)
to handle (8). Maintain 3000 psi pressure.
53.
After 1 minute, check RETURN port (7) for
leaks. Leaks shall not exceed 32 cc per minute.
54.
Check pressure gage (21) for 2 minutes. Gage
shall read 935 to 1090 psi. Pressure reading
shall not vary more than 30 psi during 2 minutes.
55.
With aid of helper, remove 94 pound weight (22)
from handle (8). Check cylinder (1). Cylinder
shall extend until bearings (9 and 10) are 13
inches apart.
56.
Close shutoff valve (11) to reduce pressure to 0
psi.
57.
Remove graduate (20).
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