TM 1-1520-238-23
6-296.2
Change 6
6.67A.
MAIN TRANSMISSION ROTOR BRAKE ACTUATOR (PARKER-HANNIFIN)
DISASSEMBLY/ASSEMBLY (AVIM)
6.67A.1. Description
This task covers:
Disassembly. Cleaning. Inspection. Assembly. Testing.
6.67A.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)
2 - 12-inch inside micrometer caliper (item 56, App H)
4-inch vise jaw caps (item 59, App H)
0.000 - 0.125-inch dial indicator depth gage (item 145,
App H)
0.0015 - 0.0250-inch thickness gage (item 152, App H)
Chemical protective gloves (item 154, App H)
Hand operated arbor press (item 234, App H)
Tube reducer (item 254, App H)
Adjustable air filtering respirator (item 262, App H)
Hydraulic test stand (item 357, App H)
Rotor brake tool set (item 369, App H)
Pin-plug removal tool kit (item 387A, App H)
4-inch machinist’s vise (item 402, App H)
0 - 300 inch-pound 3/8-inch drive click type torque
wrench (item 439, App H)
0 - 75 inch-pound 1/4-inch drive dial indicator torque
wrench (item 446, App H)
Brake Disk Test Segment (Figure D-473, App D)
Materials/Parts:
Bolt (NAS 149-68 for testing) (2)
Nut (HS 4143-7 for testing) (2)
Packing (6) per cylinder
Plug (3)
Seal (2)
Washer (MS20002C9 for testing) (4)
Antiseize compound (item 27, App F)
Grease (item 85, App F)
Hydraulic fluid (item 92, App F)
Sealing compound (item 168, App F)
Personnel Required:
68H
Aircraft Pneudraulics Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
WARNING
FLIGHT SAFETY PART
The rotor brake actuator is a flight safety part. Failure to follow maintenance instructions may
result in serious injury or death of crewmembers and/or serious damage to the helicopter.
NOTE
Disassembly, cleaning, inspection, and assembly procedures in this task are typical for both rotor
brake actuator cylinder halves.
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