0003
TM 1-1740-221-13&P&P
THEORY OF OPERATION - (CONTINUED)
FUEL SYSTEM
The fuel system uses a mechanical lift pump to draw fuel from the fuel tank through a fuel water separator. The fuel
water separator is equipped with a manual push button primer pump used to remove air from fuel lines during the
air bleed process. Fuel is delivered from the mechanical pump through a ilter mounted on the engine. The fuel
exits the fuel ilter and enters the injection pump and then to the four injectors.
Fuel for combustion is supplied by the low-pressure fuel system. The low-pressure fuel system also supplies excess
fuel low to cool the HEUI injectors and to remove air from the system. Components of the low-pressure system are:
Fuel tank (20 gal (76 L) capacity)
Fuel water separator and fuel ilter
Mechanical fuel transfer pump
Fuel pressure regulator (Controls fuel low back to the fuel tank).
AIR INTAKE SYSTEM
The air intake system consists of a dual dry element type ilter that is housed in the air cleaner assembly. The ilter
is located on the left side of the vehicle. It prevents dirt and other foreign materials from entering the engine.
BRAKE SYTEM
The MT3 tow vehicle is equipped with a service brake system that controls pressure application to the front and
rear axles. This dual brake system serves front and rear wheels independently. In the event of an engine failure,
braking is still by application of the service brake pedal. The service brakes, front and rear, are "wet" disc type, fully
enclosed and oil cooled. They withstand repetitive use without excessive fading, provide short stopping distances,
and are spark free. They are operated by a loor-mounted brake pedal to the right of the steering column.
The MT3 is equipped with a hand brake that actuates a caliper located on the transmission output shaft disc. It is
applied and released manually.
The MT3 is also equipped with a park position motor that engages a caliper also located on the transmission
output shaft disc when gear shifter is placed in the park position and disengages the caliper when the gear
shifter is moved from the park position.
EXHAUST SYSTEM
The exhaust system consists of an exhaust manifold, exhaust pipe, mufler, and tail pipe. Exhaust gases are
removed from the engine through the exhaust manifold which has large radius curves which permit exhaust gases
to leave the cylinders with a minimum of back pressure and power loss. The gases low into exhaust pipes and a
mufler to the atmosphere above and to the right side of the cab.
The exhaust manifold and all parts of the exhaust system are well supported with clamps and hangers.
COOLING SYSTEM
The MT3 is equipped with an radiator and cooling fan to provide engine cooling. The radiator is insulated from
vibration by rubber radiator isolator mounts.
An oil cooler is mounted to the front side of the radiator to provide transmission cooling.
The cooling system cools the engine by circulating (water pump) ethylene glycol-based coolant through the
engine and radiator.
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