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TM 5-4320-305-10
1-15.
PUMP DRIVE OPERATION
The impeller rotates at engine speed. Adjusting engine speed changes the impeller speed, and results in changes to the
suction and discharge pressures. Increasing or decreasing engine speed increases or decreases the speed of impeller
rotation. By increasing or decreasing the speed of impeller rotation, the pumping rate and discharge head are increased
or decreased.
1-16.
ENGINE
Engine subsystems are: electrical system, lubrication system, cooling system, and fuel system. The components and
functions of these subsystems are explained below.
Electrical system. The components of the engine electrical system are the batteries, starting motor, alternator, and wiring
harness. The batteries provide electric power to run the starting motor and start the engine. The alternator recharges the
batteries after the engine is started and provides power to all the electrical components through the wiring harness.
b.
Lubrication system. The components of the engine lubrication system are the lube oil pump, lube oil
cooler, and lube oil filter. The lube oil pump pumps oil to reduce friction between moving parts. The lube oil cooler
reduces the temperature of the lube oil which cools the engine. The lube oil filter removes impurities from the oil.
c.
Cooling system. The major components of the engine cooling system are the cooling air blower, the
cooling air ducting, and the lube oil cooler. The primary coolant is the engine lube oil. The secondary coolant is forced
air. The lube oil circulating through the engine removes heat from the engine. The cooling air blower forces air onto the
cylinders and through the oil cooler. The forced air removes heat from the lube oil. The cooled lube oil again circulates
through the engine to remove heat.
d.
Fuel system. The major components of the engine fuel system are the fuel feed pump, fuel injection pump,
fuel tank, fuel filter, and fuel lines. The fuel feed pump draws fuel from the fuel tank, through the filter, to the fuel
injection pump. The injection pump injects fuel into the engine cylinders. The fuel lines connect these components.
1-17.
TRAILER ASSEMBLY
The major components of the trailer assembly are the wheel and axle assemblies, the front and rear jack assemblies, the
inertia and hand brake assemblies, and wiring system. The wiring system is rated at 24 volts and has an intervehicular
connector for connection to the towing vehicle.
a.
Jack assemblies. The front and rear jack assemblies work together to level and stabilize the trailer during
pumping operation. The front jack is lowered when the trailer is first removed from the towing vehicle. This jack
establishes initial level and supports the trailer tongue. The rear jacks are lowered after the front jack is securely in
position. The rear jacks are lowered until they firmly contact the ground, without lifting the trailer. In this manner, the
trailer is held securely between the front and rear jacks.
b.
Brake systems. The trailer is equipped with two brake systems. Inertia brakes function automatically while
the trailer is being towed. The inertia brake actuator is attached to the towing coupling. When the towing vehicle stops,
the weight of the trailer pushes forward against the brake actuator, and the actuator applies the trailer brakes. When the
trailer stops completely, pressure is removed from the towing coupling and the actuator. The hand brakes must be set
when the trailer is parked. These brakes are set and released by setting the hand brake lever.
1-13/(1-14 blank)
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