TM 55-1905-242-14
OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
THEORY OF OPERATION
HYDRAULIC SYSTEM
GENERAL
The LCM-8 Mod 2 is provided with three separate hydraulic systems. One system operates the starting system for the
propulsion engines, another operates the steering system, and the last operates the bilge pumps, bow ramp, and crane.
Each system has its own pumps, filters, piping, and controls. The hydraulic steering system has its own reservoir, while the
starting system shares a partitioned reservoir with the bilge/ramp/crane system.
PROPULSION ENGINE HYDRAULIC STARTING SYSTEM
General
This system's sole purpose is to start the propulsion engines. The system consists of a reservoir, two engine-driven pumps,
one hand pump, two pairs of accumulators, two control valves, two starting motors, and several valves, filters, and gauges.
CONTROL
VALVE
STARTING MOTOR
STARTING MOTOR
CONTROL
VALVE
INLINE
FILTER
INLINE FILTER
RETURN
RETURN
IN
HAND CHARGING
HYDRAULIC PUMP
PUMP VALVE
(2 PLACES)
HAND CHARGING
PUMP
IN
OUT
OUT
ISOLATION
VALVE
SUCTION
RELIEF
SUCTION
FILTER
VALVE
VALVE
GAUGE VALVE
RELIEF
ACCUMULATOR
(4 PLACES)
VALVE
VALVE
(4 PLACES)
ACCUMULATOR
(4 PLACES)
ACCUMULATOR
GAUGE
RESERVOIR
0 TO 5000 lb/in2
(4 PLACES)
BLOWDOWN
VALVE
PILOTHOUSE
GAUGE
PROPULSION ENGINE HYDRAULIC STARTING SYSTEM SCHEMATIC
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