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TM 10-3930-638-24&P
Section III. PRINCIPLES OF OPERATION
Para
Para
Forklift Truck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Transmission and Drive Shafts . . . . . . . . . . . . . . . . . 1-20
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Axles and Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Steering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Body and Towing Attachments . . . . . . . . . . . . . . . . 1-24
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Hydraulic Lift System . . . . . . . . . . . . . . . . . . . . . . . . 1-25
1-14. FORKLIFT TRUCK
a. Engine. The diesel engine is an internal combustion
power unit in which the heat of diesel fuel is converted
into work in the engine cylinders. The engine relies on
the heat of compressed air to ignite the fuel. Fuel flow and
engine speed are controlled by the fuel injection pump
governor and fuel injectors.
b. Fuel System. Fuel is drawn from fuel tank by electric
fuel pump through an in-line fuel falter, filtered by primary
and final fuel filters, routed to fuel injection pump and
then applied to fuel injectors where the fuel is injected
into the engine cylinders.
c. Exhaust System. Engine combustion by-products are
channeled through the exhaust manifold, muffler and
exhaust pipe. The muffler aids in quieting engine noise.
d. Cooling System. Provides cooling water to engine.
Water is circulated through engine by water pump which is
belt driven by crankshaft pulley. Transmission oil cooler
is located in front of radiator. Radiator is equipped with
coolant recovery system.
e. Electrical System. 24 Volt system with negative
ground. Power provided by two batteries. Alternators
mounted on. and driven by engine. Ignition switch controls
application of power to main light switch and starter motor.
f. Transmission and Drive Shafts. Three speeds in both
forward and reverse, has declutch feature which permits
neutralizing transmission. equipped with axle disconnect.
Three drive shafts used to transmit power to front and rear
axles.
g. Axles and Wheels. Single reduction type axles;
pneumatic tires. Front axle is rigidly mounted; rear
axle is trunnion mounted.
h. Brakes. Service brakes consist of drum and shoe
hydraulic wheel brakes on front and rear wheels for
stopping the truck. A hydraulic brake valve is mounted
under the front chassis and provides power assist for
service brakes. Parking brake is mounted on output shaft
of transmission.
i. Steering System. Consists of hydraulic steering gear,
steering wheel, and two steering cylinders one mounted
on each side of truck. Power assist provided by hydraulic
pump mounted on, and driven by, transmission.
j. Body and Towing Attachments. Chassis is comprised
of front chassis and rear chassis connected together by
pivot pins. This enables steering to be accomplished by
pivoting of front and rear chassis on pins by means of a
steering cylinder mounted on each side of chassis to front
and rear chassis. Pintle hook, and tow bar and chains,
all located at rear enable towing to be accomplished.
k. Hydraulic Lift System. Hydraulic power supplied by
hydraulic pump mounted on, and driven by, transmission.
Hydraulic oil routed through hoses to control valve which
controls flow of oil to lift cylinder, and to and from tilt
cylinders. side shift cylinder, and rotation cylinder.
1 - 1 5 . E N G I N E
The engine is a four cylinder, in-line, four-stroke-cycle,
valve-in-head diesel engine. Air enters the intake manifold
through a dry-type air cleaner. An ether injection arrange-
ment is connected to the intake manifold for quick starting
of the engine during cold weather.
1-7
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