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BRAKE SYSTEM. - TM-10-3930-622-140029
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TM-10-3930-622-14 Truck Fork Lift; Gasoline Engine Driven; Pneumatic Tires; 6000-lb Capacity; 173-In. Lift Manual
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FRAME - TM-10-3930-622-140031
e. Lift carriage assembly.
The lift carriage
cylinder is connected to the frame of the truck; the other
assembly is mounted on rollers between the outer
end is fastened to the steering linkage. In case of loss of
upright assembly and inner upright assembly.  The
system pressure, the truck can be steered manually, but
rollers are mounted to trunnions welded to the rear of the
greater effort at the steering wheel will be necessary.
carriage. Adjustable side thrust rollers are also secured
b. Steering axle assembly.
The steering axle
to the carriage assembly to limit its lateral movement.
assembly mounted on the extreme rear of the fork lift
Two lift forks are mounted on the front of the lift carriage
truck is mounted on two neoprene blocks located to
assembly for handling of loads.
permit a degree of movement to the axle necessary to
f.  Upright  assembly hydraulic  system.
The
pass over irregular surfaces. Two equal length tie rods
complete hydraulic lift system consists of an engine-
connect a center-mounted bellcrank to each of the
driven hydraulic pump, reservoir tank, control valve
steering knuckles. Steering axle king pins are mounted
assembly, two tilt cylinders and a hoist cylinder. Power is
in true vertical position to provide similar steering
supplied to the vertical lift by means of a hydraulic
characteristics in either forward or reverse travel. The
cylinder, two chains and rollers. Hydraulic pressure for
pneumatic tired wheels of the steering axle are not fitted
steering, hoisting, and tilting of the uprights is supplied by
with brakes.
an engine-driven hydraulic pump. This pump is driven by
c.  Steering hydraulic  system.
The
steering
a gear which engages the cam-shaft timing gear. The
hydraulic system consists of a hydraulic flow divider
pump is a gear type positive displacement pump, rated
valve, connecting hoses, steering booster and valve
to deliver 19.7 gallons per minute at 2000 psi when
assembly and a steering gear unit.
driven at 2400 rpm. The control valve assembly is a two-
spool fluid control valve with a control handle for each
d. Steering booster cylinder and valve. Movement
spool. The inboard control handle and spool control the
of the pitman arm on the steering gear actuates the
raising and lowering of the forks by applying or releasing
steering valve, which is integral with the steering booster
hydraulic pressure to the hoist cylinder. The outboard
cylinder.  The cylinder, in turn, actuates the steering
control handle and spool control tilting of the upright
bellcrank on the steering axle assembly.
carriage.
Each control handle has two actuating
e. Flow divider valve. The flow divider valve directs
positions with a center neutral position. A pilot operated
the pump output to both the power steering system and
relief valve limits system pressure to 1800 psi.  The
the control valve assembly inlet port. A relief valve in the
levers, mounted to the right of the operator, are plainly
flow divider valve limits hydraulic pressure in the power
marked for identification and are spring-centered to
steering system. The first three gallons of hydraulic fluid
neutral. To hoist, the hoist lever is pushed back. This
from the hydraulic pump go through the flow divider valve
action forces oil into the lift cylinder and raises the load.
to the steering gear assembly. The remaining hydraulic
To lower, the hoist lever is pushed forward, releasing
fluid is diverted to the hydraulic system.
pressure and allowing the load to lower by means of
gravity. If in raising the hoist, the lever is not returned to
1-18.
ELECTRICAL SYSTEM.
neutral when top of stroke is reached, an overload
bypass in the control valve will open automatically and
a. General.
The following paragraphs contain
detour the flow of oil back to the reservoir. The tilt action
descriptions of electrical system components for the fork
of the hoist mechanism is operated by the control valve
lift truck with the exception of those assemblies already
in conjunction with two hydraulic cylinders. Operation is
described dealing with the engine assembly.
similar to that of the hoist cylinder except that in tilting,
b. Combination stoplight-taillight assembly.  The
both movements are actuated by hydraulic pressure.
combination stoplight-taillight is mounted within a steel
Pushing the tilt lever back will result in backward tilt and
guard on the upper rear of the engine compartment. The
forward will result in forward tilt.
light is operated both from a toggle switch mounted on
the instrument housing and the stop switch on the brake
1-17.
STEERING MECHANISM.
master cylinder.  The stoplight is inoperable with the
a. General. The steering mechanism consists of
ignition switch in the off position.
the steering gear assembly, steering booster cylinder
c.  Ignition switch. The ignition switch is mounted
and valve assembly, flow divider valve and steering or
on the instrument housing. Setting the ignition switch to
trailing axle assembly with connecting linkage.  The
ON position energizes the ignition system, instrument
power steering systems recirculating ball steering gear
housing gages  and torque converter  temperature
with booster equipment is powered by the truck's engine-
warning light.
driven hydraulic pump.  A valve incorporated in the
steering gear responds to the operator's effort to turn the
d. Neutral safety switch. The neutral safety switch
steering wheel to direct system pressure to the
prevents starting the engine while the vehicle is in gear
appropriate end of a booster cylinder. One end of the
6

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