TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 91 of 481
TM 9-2320-272-10
1-74
1-21. CONTROL SYSTEM OPERATION (Contd)
CLUTCH LEVER - Manual control that engages the winch drum gear to the
drive gear of the winch motor.
OIL FILTER - Filters used or bypassed oil from the control valve before it
returns to the hydraulic oil reservoir.
HYDRAULIC OIL RESERVOIR - Storage tank for hydraulic oil.
CONTROL VALVE - Four-port valve accepts pressurized oil from the
hydraulic pump and directs this oil to the winch motor. It also directs oil
returning from the winch back to the oil reservoir. The flow of this oil from
the valve determines the directional drive of the winch motor.
WINCH MOTOR - Converts hydraulic power into mechanical power as
hydraulic oil is forced through the winch motor.
b. Rear Winch Hydraulic System Operation.
A rear winch is installed only on the M936/A1/A2 medium wrecker. It is
primarily to rescue vehicles that have become deeply mired. The rear winch
hydraulic system converts mechanical power of the engine into fluid power through
use of the hydraulic pump and back into mechanical power at the winch drive
motor. The major components of the rear winch hydraulic system are:
E
D
C
B
A
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