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 TM 55-1905-223-24-16
SECTION III. PRINCIPLES OF OPEELATION
Overview. This write up on principles of operation should give you an expanded view of the way the
subassembly works.
1-11.
General. The stern anchor winch is hydraulically driven and electrically operated.
a. Spool and Gearbox. The spool, with a capacity of 1200 feet of wire rope, is mounted directly on the shaft of the
triple reduction gearbox. The spool is free to rotate on the shaft, and drive is applied by means of a manually operated,
four jaw, sliding clutch. The clutch lever is used to lock the clutch in either the engaged or disengaged position.
Mechanical braking of the spool is provided by means of a split contracting band. The brake is manually operated by a
handwheel. The top band of the brake is spring mounted to prevent dragging when not applied. Adjusting screws are
provided for drag adjustment. A lever operated dog, which engages the spool flange, mechanically locks the winch when
not in operation.
b. Levelwind. The levelwind provides smooth laying of the wire rope on the spool. A levelwind carriage, consisting of
vertical and horizontal rollers through which the wire rope passes, traverses the width of the spool driven by a diamond
shaft. The diamond shaft is driven by a series of chains and sprockets from the spool. A pawl in the levelwind carriage
engages the slot in the diamond shaft.
c. Hydraulic Motor Assembly/Failsafe Brake. The hydraulic system consists of a hydraulic power pack assembly and
a hydraulic motor assembly/failsafe brake assembly.
(1) The hydraulic power pack assembly consists of a vane-type hydraulic pump driven by a constant speed
alternating current motor. Both the pump and ac motor are mounted directly on the hydraulic reservoir. The pump,
mechanically coupled to the motor via a rubber spider, supplies high pressure fluid (2900 pounds per square inch) to the
directional control valve. The hydraulic pump assembly/ failsafe brake assembly is connected across the A and B ports of
the directional control valve. The directional control valve provides for payout, haulback, and neutral operation of the
winch. In the neutral position, fluid is circulated through the reservoir. A pressure gauge located on the directional control
valve indicates operating hydraulic pressure within the system, and system pressure is controlled by an adjustable
pressure relief valve that is also located on the directional control valve. The hydraulic power pack assembly is located
and installed in the steering gear compartment. The hydraulic power pack assembly is provided with the following
features:
(a) Alternating current motor.
(b)
Hydraulic pump.
(c)
Coupling adapter between motor and pump.
(d)
Solenoid operated directional control valve for winch operations.
(e)
Filler cap/breather.
1-8
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