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TM 10-3930-659-34
Section III. PRINCIPLES OF OPERATION
Paragraph
Page
Number
Paragraph Title
Number
1-11
Drive Train System ...........................................................................................................................
1-8
1-12
Service Brake System ......................................................................................................................
1-8
1-13
Steering System ...............................................................................................................................
1-9
1-14
Forklift Hydraulic System ..............................................................................................................
1-9
1-15
Electrical System ..............................................................................................................................
1-9
1-16
On-board Crane ...............................................................................................................................
1-10
1-17
Forklift Winterization Package ..........................................................................................................
1-10
1-11.
DRIVE TRAIN SYSTEM.
a. Engine. The engine is a six-cylinder turbocharged diesel which supplies rotational power to the transmission.
The cooling system is pressurized and includes a thermostat, controlled bypass, and coolant recovery bottle. Engine
lubrication is pressurized and oil is continuously cleaned by full-flow filters.
b. Drive Dampener. The drive dampener connects the engine to the transmission and absorbs torque spikes that
could develop in the drive train.
c. Transmission. The transmission input shaft turns at engine speed. A speed reduction takes place within the
transmission according to the speed range selected by the operator. The direction of forklift truck travel is also determined
by the transmission. Both speed and direction selection are made by hydraulically operated clutches in the transmission.
d. Drive Shafts. The drive shafts transmit rotation of the transmission output to the front and rear axles.
Connections at both ends are made through universal joints to compensate for any misalinement.
e. Front and Rear Axles. The front and rear axles are identical in operating principle. The rear axle is different in
that it oscillates 11 ° above and below horizontal. Both axles drive whenever the transmission is engaged. Neither axle
can be independently disconnected.
1-12.
SERVICE BRAKE SYSTEM.
a. Introduction. The service brakes are foot controlled, hydraulic-type brakes. The system is supplied pressurized
hydraulic oil by a pressure compensated pump that is driven by the engine.
b. Fork/Brake Hydraulic Pump. The fork/brake hydraulic pump is a variable displacement, pressure compensated,
piston-type pump. It supplies flow to both the service brake system and to the fork attachment cylinder circuits.
c. Accumulators. The accumulators in the brake system store a charge of pressurized oil which allows a number
of brake applications in the event of pump failure or engine shutdown.
d. Brake Valves. The two brake valves are identical and are operated by separate foot pedals. Depressing either
foot pedal will cause all four wheel brakes to operate.
1-8
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