Main Propulsion System - TM-55-1905-223-100125

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FIGURE 1-34. Steering Gear Hydraulic Piping System.

TM-55-1905-223-10 Landing Craft Utility (LCU 200 Class) NSN 1905-01-154-1191 Manual

Bow thruster Power System

TM 55-1905-223-10

1-16. Main Propulsion System. The main propulsion system is the power source for the main reduction gear

and clutch system which transfers the power to the LCU's propellers. The system consists of two diesel

engines. The engines counter-rotate; the port engine rotates counterclockwise, and the starboard engine

rotates clockwise. The engines can be operated together or individually.

a. Engine Instrument and Control Panel. The engine control panel contains indicators which monitor the

operation of the engine. Conditions monitored by the control panel are oil temperature, oil pressure, cooling

water temperature, oil differential pressure across oil filters, exhaust temperature by bank, starting air pressure,

engine RPM (tachometer), and total engine operating hours. These conditions are monitored at the engine

room console (ERC) and pilothouse console by the machinery plant monitoring system. The engines can be

started and stopped locally at the panel and remotely from the ERC. The engine may be stopped from the

PHC, utilizing the main engine emergency trip pushbuttons.

b. Fuel System. The fuel system which is composed of a fuel pump containing a governor, is driven by

the front engine gear train. Filtered fuel is supplied to the injectors via the fuel manifold and cylinder head

drillings. Timing is provided by a camshaft through cam rollers and push-tubes to injector rockers which

actuate the injectors at the proper time. The governor maintains the speed of the engine at a setting

determined by the engine operator. An automatic shutdown feature, which is controlled from the machinery

plant monitoring system, will energize a shutdown solenoid, cutting off fuel flow to the engine. This solenoid

also contains a plunger for manual shutdown. The fuel system receives fuel oil from the fuel oil transfer piping

system.

c. Air Starting System. The main engine air starting system provides low pressure air to starting motors

during engine startup. When energized, a solenoid valve releases air to the starting motor and the motor

cranks the engine. The air starting system requires low pressure air from the compressed air piping system.

d. Lubricating Oil System. The engine is pressure lubricated by a gear-type oil pump mounted to the

block and driven by the rear crankshaft gear. The lubricating oil system receives oil from and returns oil to the

engine sump. Lubricating oil is supplied to the engine sump from the external lubricating oil tank via the lube

oil transfer and dirty oil discharge piping system.

e. Cooling System. The main engine cooling system provides fresh water cooling to the engines. The

cooling system receives fresh water from the fresh water cooling piping system. Fresh water is drawn into the

cooling system by centrifugal pumps, pumped through the engine and discharged back to the fresh water

cooling piping system. The piping system then routes the heated water through the keel cooler to cool the fresh

water before it is pumped back through the engines. The cooling system also contains expansion tanks that

handle cooling system overflow and provide a convenient point for adding coolant to the system.

1-17. Reverse Reduction Gearbox System. The reverse reduction gearbox provides power (torque) transfer

from the main engines to the propeller shafts. The system consists of the reverse reduction gear and

lubricating oil cooling pump.

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