STEERING MECHANISM.

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