TM 9-2350-247-10
THEORY OF OPERATION — Continued
0003 00
ENGINE AND DRIVE TRAIN
The engine converts air and diesel fuel into energy. The engine delivers this power to the transmission, variable fan speed and
alternator drive. The variable fan speed and alternator drive drives the alternator and cooling fan. Air for combustion flows
through the air cleaner, turbocharger, and the engine. A drive train transfers power from the engine to the carrier tracks. The
drive train consists of the engine, transmission, drive lines, final drive assemblies, and drive sprockets.
COOLING SYSTEM
The engine and transmission generate heat during normal operation. The cooling system transfers some of the heat to the
outside to maintain a safe operating temperature. A mixture of antifreeze and water is pumped through the cooling system to
cool the engine and transmission. Stop engine if temperature goes above 220
F (104.4
C). The engine cooling system has a
capacity of 13.3 gallons (50.34 liters). The cooling system should be checked regularly. Refer to Check/Fill Cooling System
(M548A3) (WP 0066 00).
COLD START SYSTEM
The engine is equipped with a cold start system (glow plugs). The glow plugs assist the engine starting at low ambient
temperatures (below 40
F (4.4
C). It consists of glow plugs, which are installed in the cylinder heads, and a controller that
regulates the starting cycle and preglow/afterglow duration.
STEERING AND BRAKING
The steering and braking systems are an integral part of the cross drive transmission. The main controls are located in the
driver’s compartment. Center the steering wheel and set the transmission controller to the SL (steering lock) position
whenever the carrier is being started, idling, or shut down. The steering wheel is locked manually by the driver. If the steering
wheel is not centered and locked, the carrier will turn (pivot) regardless of the position of the transmission controller.
STEERING WHEEL AND STEERING WHEEL LOCK PIN
The steering wheel controls direction of carrier travel on land or water. The steering wheel lock pin locks the steering wheel
in the center position to prevent pivoting the carrier when starting, warming up, or cooling down the engine.
TRANSMISSION SHIFT CONTROLLER
The transmission shifter is used to select driving range of transmission. The transmission shift controller has seven positions
to choose from. See driver’s controls (WP 0004 00) for a description of each position.
FUEL CUTOFF CONTROL
To start fuel flowing to the engine, push the fuel cutoff control all the way in. To stop fuel flow to the engine, pull the fuel
cutoff control all the way out. This shuts down or stops the engine from operating.
HAND THROTTLE CONTROL
The hand throttle control is used to set the engine speed for various reasons. To set the engine speed, while pushing down the
accelerator pedal, pull hand throttle control out until desired rpm is indicated by tachometer. Turn the hand throttle control
clockwise to lock the control and counterclockwise to release the control. Once the hand throttle control is set, the engine will
maintain the set speed without holding down the accelerator pedal.
MAIN LIGHT SWITCH
The main light switch is used to control all of the exterior lights and the instrument panel lights. To select lights, push up and
hold the UNLOCK lever before moving desired lever to the position wanted. Refer to Operate Carrier Lights (WP 0032 00).
0003 00-3
