HYDRAULIC 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
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: 1-74