TM 55-1520-240-23-6
7-228
TEST BRAKE MASTER CYLINDER (AVIM)
(Continued)
7-228
58.
Connect handpump pressure hose (23) to
RETURN port (7).
59.
Open shutoff valve (11). Apply 3000 psi to
PRESS port (5).
60.
Apply 50 psi to RETURN port (7).
61.
With aid of helper, attach 50 pound weight (24)
to handle (8).
62.
Open shutoff valve (17) and bleed fluid from
cylinder (1) until bearings (9 and 10) are 11.5
inch apart. Close shutoff valve (17).
63.
Check pressure gage (21). Gage shall read 725
to 825 psi.
64.
Push up handle (8) until bearings (9 and 10) are
13 inches apart.
65.
Check pressure gage (21). Gage shall read 790
to 950 psi.
66.
With aid of helper, remove 50 pound weight (24)
from handle (8).
NOTE
Cylinder is cycled by moving cylinder
between 13 inch position and 11.5
inch position.
67.
Cycle cylinder (1) 25 times.
68.
After 25 cycles check cylinder (1). External
leakage shall not exceed 1 drop. There shall be
no chattering or vibration.
7-865
