Section III. PRINCIPLES OF OPERATION - TM-9-2320-285-24-10014

TM 9-2320-285-24-1

Section III. PRINCIPLES OF OPERATION

Para

Yard Tractor ..................................................

1-15

Brakes ............................................................

1-23

Engine ...........................................................

1-16

Wheels ...........................................................

1-24

Fuel System...................................................

1-17

Steering System.............................................

1-25

Exhaust System.............................................

1-18

Frame and Towing Attachments ....................

1-26

Cooling System .............................................

1-19

Springs and Shock Absorbers .......................

1-27

Electrical System ...........................................

1-20

Cab and Body.................................................

1-28

Transmission and Propeller

Accessories ....................................................

1-29

Shaft ...........................................................

1-21

Fifth Wheel Hydraulic System ........................

1-30

Axles..............................................................

1-22

Cab Tilt Hydraulic System..............................

1-31

Gages.............................................................

1-32

1-15.

YARD TRACTOR

ENGINE. Diesel engine, internal combustion power unit; engine has no carburetor or electrical ignition system,

relies on heat of compressed air alone to ignite fuel; heat of diesel fuel is converted to work in engine cylinders.

FUEL SYSTEM. Fuel is pumped from fuel tank into fuel injectors, then sprayed into combustion chamber.

EXHAUST SYSTEM. Engine exhaust gases are expelled through muffler and exhaust stack mounted on right

side of tractor; muffler aids in quieting engine noise.

COOLING SYSTEM. Cools engine by circulating coolant; cooling air is drawn through radiator by belt-driven fan;

water pump draws coolant from radiator. Radiator is equipped with coolant recovery system.

ELECTRICAL SYSTEM. 12 volt, supplied by four wet-cell batteries in parallel; engine-driven, 90 ampere alternator

supplies current. Key switch controls application of power to circuits.

POWER TRAIN. Consists of transmission, propeller shaft, differential, and rear axle; transmits motive power from

engine to rear wheels.

BRAKES. Drum type, operated by air pressure; service brakes controlled by cab brake treadle, independent of

parking brake control.

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