POWER AXLE ASSEMBLY.

4-15. The clutches in the transmission are contained in

4-22.

STEERING BOOSTER AND VALVE.

one large balanced drum assembly and the plates drive

concentric shafts. The outer shaft has a gear mounted

4-23. The rod end of the steering cylinder piston is

on it which is in direct mesh with the output gear on the

anchored to the vehicle. The cylinder and valve body are

output shaft. This transmits reverse rotation to the

connected to the wheels through linkage and the valve is

output shaft. The inner shaft has a gear mounted on it

linked to the steering gear by a control rod. Road shock

which is in mesh with the output gear through an idler

forces on the wheels tend to move the cylinder, but this

gear. This transmits forward rotation to the output shaft.

action also moves the valve body in relation to the spool,

Therefore, the drive train consists of only four gears.

which is being held by the control rod. Movement of the

The output flange slips within a sealed grease cavity.

valve body relative to the valve spool directs oil to the

This arrangement leads toward long seal life and

cylinder to compensate for the road shock loads and to

minimum leakage. The main case is of two piece cast

maintain vehicle directional control at the steering wheel.

construction and the rear half contains a heavy

diaphragm midwall which forms one side of a rigid

4-24. When the valve spool is moved in either

straddle mounted support for the output gear and shaft.

direction by movement of the steering wheel and control

Oil passages run within the walls of the case.

rod, oil is directed to the cylinder. This causes the

cylinder and valve body to move in the desired direction

4-16.

POWER AXLE ASSEMBLY.

relative to the piston and rod which is anchored to the

vehicle. Movement of the cylinder and valve body,

4-17. The power axle assembly contains the gears,

which, through linkage, are connected to the wheels,

shafts, bearings and other components necessary to

steers the vehicle.

transmit power directly to the front wheels of the fork lift

truck. The power axle also supports the front weight of

4-25. Movement of the steering wheel in either

the vehicle and mounts service brakes which enable a

direction is transmitted through mechanical linkage to the

uniform braking force to be applied directly to the wheels.

control valve ball stud. Movement of the ball stud

The power axle assembly is mounted directly to the

causes movement of the control spool. Oil flow is

transmission assembly and frame assembly.

directed by spool position to either the head end or rod

end of the cylinder which causes the cylinder to extend

4-18. Driving power is applied to the bevel Sear and

or retract. Movement of the cylinder will continue as long

differential assembly in the power axle through the

as the control spool is offset by continued turning of the

propeller shaft connected to the transmission assembly.

steering wheel. When the steering wheel stops turning,

The differential assembly consists of a ring gear, pinion

the control spool stops and the cylinder and valve body

gears and side gears. The inner end of the drive shafts

move to center (neutral) position and stop. This is true in

are splined to connect directly to the differential side

any position of the steering wheel as steering pitman arm

gears. The truck wheels are rigidly attached to axle hub

stops are provided to prevent the cylinder from bottoming

and drum assemblies mounted at the outer end of the

with the wheels against the wheel stops. in the event of

axle shafts.

power source failure, the ball check in the steering

control valve body will permit free flow of oil throughout

4-19.

SERVICE BRAKE SYSTEM.

the steering unit. This permits the steering system to be

operated manually.

4-20. The service brake system consists of the brake

pedals and linkage, master cylinder assembly, hydraulic

4-26. CONTROLS.

lines to front wheels, wheel cylinder assemblies, brake

a. Ignition Switch and Starter Button. The ignition

drums and brake shoes.

switch is located on the lower right side of the instrument

cluster case. Push the switch upward to the ON position

4-21. Brake pedal pressure forces hydraulic fluid from

to activate the electrical system. (The direction shift

the master cylinder assembly through the brake line, into

lever must be in the N (neutral) position.) Depress the

the wheel cylinder assemblies.

The pressure of

starter button located on the lower left side of the

hydraulic fluid within each wheel cylinder body displaces

instrument cluster case to activate the starter solenoid

pistons which are coupled to the upper ends of the

which in turn will cause the starter motor to crank the

hinged brake shoes. The brake shoes are forced

engine. Release starter button when engine commences

outward, and the lining of each brake shoe applies

to operate. Push the ignition switch to the OFF position

friction force to the brake drum. When the brake pedal is

to shut off the supply of electric current to the ignition

released, the hydraulic fluid pressure from the master

system and to the electrically operated gages.

cylinder assembly is released and the pistons and brake

b. Choke Control. The choke control is located on

shoes return to their original positions by spring

the lower right side of the operator's seat on the cowl.

pressure. The surplus hydraulic fluid in the system then

The normal operating position for the choke control is

returns to the master cylinder.

pushed in as far as it will go. Pull out the choke control to