TM 1-1520-238-23
3-250
3.63.
BRAKE CONTROL VALVES INTERNAL LEAKAGE REPAIR AND TEST (AVIM)
3.63.1. Description
This task covers:
Disassembly. Cleaning. Inspection. Repair. Assembly. Test.
3.63.2. Initial Setup
Tools:
Hydraulic tool kit (item 384, App H)
Light duty laboratory apron (item 27, App H)
0.000 - 6.000-inch outside micrometer caliper set
(item 52, App H)
Industrial faceshield (item 129, App H)
0.400 - 0.500-inch small hole gage (item 151, App H)
Chemical protective gloves (item 154, App H)
0 - 25 pound spring resiliency tester (item 353, App H)
Portable hydraulic test stand (item 358, App H)
0 - 30 inch-pound 1/4-inch drive dial indicator torque
wrench (item 445, App H)
Materials/Parts:
Cap disk
Packing (2)
Cloth (item 50, App F)
Hydraulic fluid (item 93, App F)
Lapping and grinding compound (item 107, App F)
Lapping and grinding compound (item 108, App F)
Wire (item 226, App F)
Personnel Required:
68H
Aircraft Pneudraulics Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
3.63.3. Disassembly
WARNING
Brake control valve is spring loaded.
Remove valve cap carefully to prevent
injury. If injury to personnel occurs,
seek medical aid.
a. Remove valve cap (1) from brake control valve
(2).
(1) Remove lockwire from four screws (3).
(2) Remove four screws (3) from cap (1).
(3) Remove cap (1) and packing (4) from valve
(2). Discard packing (4).
(4) Remove compressed helical spring (5) from
hydraulic brake piston (6).
(5) Remove piston (6) and packing (7) from valve
(2). Discard packing (7).
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