Steering Gear System

TM 55-1915-200-10

control room and provides fire indications. The main

engine operator.

The governor also contains an

panel keypad is used for authorized entry. If the door is

automatic shutdown feature which is controlled from the

opened without the keypad, audible and indicator alarms

Centralized Control and Monitoring System (CCMS).

at the main and remote panels are energized. An

The shutdown solenoid on the governor deenergizes in

audible alarm sounds and strobe alarms light on all

response to malfunction indications from the CCMS.

panels when a fire alarm signal is received from the

This cuts off the flow of fuel to the engines. The

main fire alarm panel.

solenoid also contains a plunger for manual shutdown.

1-10.7. Steering Gear System. The steering gear

1-10.8.3. Air Starting System. The main engine air

system is an electrically driven, hydraulically operated

starting system provides low pressure air to starting

system that positions the rudder in response to steering

motors during engine startup. When energized, a

commands. Rudder position commands are input to the

solenoid valve releases air from a tank to the starting

steering gear by the movement of a joystick or wheel to

motor. The motor cranks the engine. The air starting

generate an electrical signal. The signal operates

system requires low pressure air from the LSV

solenoid activated hydraulic control valves in the

compressed air piping system (FIGURE 1-30). The low

hydraulic power unit. The control valves direct the flow

pressure air is supplied via a reducer and an automatic

of hydraulic fluid from the hydraulic pump to power

oil and water separator.

cylinders attached to the rudder tiller arms which

position the rudder. The hydraulic system consists of

1-10.8.4. Fuel System. The main engine fuel system

redundant, electrical-hydraulic power units. Either unit

receives, filters, and injects fuel into the propulsion

can be selected from the pilothouse.

engines. The fuel system receives fuel oil from the

main engine fuel oil service piping system (FIGURE 1-

1-10.8. Main Propulsion System. The main propulsion

31).

system is the power source for the main reduction gear

and clutch system which transfers the power to the

1-10.8.5. Lubricating Oil System. The main engine

LSV's propellers. The main propulsion system for the

lubricating oil system provides oil under pressure to

LSV consists of two diesel engines. The engines

most moving parts of the engine. The lubricating oil

counter-rotate; the port engine rotates counterclockwise,

system receives oil from and returns oil to the engine

and the starboard engine rotates clockwise. They can

sump. Oil is supplied to engine sump from the storage

be operated together or individually.

tank via the lubrication oil transfer system (FIGURE 1-

32).

1-10.8.1. Engine Monitoring Panel. The engine control

1-10.8.6. Cooling System. The main engine cooling

cabinet contains indicators which monitor the operation

of the main engines.

The monitoring panel also

system provides cooling water to the main engines. The

monitors cooling water, lubrication oil, fuel oil, start air,

cooling system receives potable water from the main

and clutch air. The main engines can be started or

engine cooling water piping system (FIGURE 1-33).

stopped remotely from the pilothouse console (PHC).

Potable water is drawn into the cooling system by

centrifugal pumps, pumped through the engine and

1-10.8.2. Governor. The governor maintains the speed

discharged back to the main engine cooling water piping

of the main engines at a setting determined by the

system.

1-80