Section IV. OPERATION

SECTION IV

OPERATION

4-1.

GENERAL.

converter determines the extent to which engine (or

input) torque is multiplied. There is no multiplication of

4-2.

This section contains a general explanation of

torque when the load can be moved with the amount of

the principles of operation applicable to the fork lift truck.

torque being produced by the engine. When the load is

This section also contains sufficient information

increased, however, a re-routing of the fluid occurs

concerning the location and use of the various controls

inside the torque converter, resulting in increased

and instruments and detailed procedures to be followed

twisting force.

to insure proper operation of the vehicle.

The torque converter has three basic parts as follows:

4-3.

PRINCIPLES OF OPERATION.

a. Impeller. The impeller, or pump, is driven by the

engine and consists of a ring of metal blades which turn

4-4.

Model FJF-060 is a mobile, rider-type

in the fluid-filled converter.

mechanized vehicle, especially designed for the lifting

and transporting of materials. The principal assemblies

b. Turbine. The turbine is made up of blades and

of the unit are as follows.

is directly connected to the shaft of the driven unit.

4-5.

DRIVE LINE ASSEMBLY.

c. Housing.

The housing, or stator, contains

stationary blades within a sealed housing assembly.

4-6.

The drive line assembly consists of an engine

assembly

with

accessories,

torque

converter,

4-12. When the impeller blades turn in the fluid, they

transmission assembly, propeller shaft and power axle

actuate the turbine from where the fluid is redirected to

assembly. Operating controls and mechanical linkage

the blades of the housing. These blades, in turn, redirect

for the drive / line assembly are attached to or extend

the fluid to the second set of blades on the turbine.

through the floor plate and are easily accessible to the

Thus, the fluid is directed and redirected through all of

operator.

the converter blades.

4-7.

ENGINE ASSEMBLY.

4-13. Under normal running conditions, the action of

the impeller causes the turbine blades to turn almost

4-8.

The engine assembly provides motive power for

freely and the fluid passes through the converter easily

propelling the fork lift truck and for driving the engine

and quickly, striking each blade at a very slight angle.

accessories, such as the generator, water pump and

When a load is encountered, however, the turbine slows

hydraulic pump. It is a six-cylinder, four-cycle, in line, "L"

down because it is directly connected to the load shaft

Head engine. The timing gears and crankshaft pulleys

and the fluid strikes the turbine blades at a sharper

for driving the accessories are located at the fan end of

angle. As the force of the fluid is relayed from blade to

the engine (rear of the vehicle). The transmission

blade, the output torque accumulates.

assembly is attached to the bellhousing end of the

engine with- the power axle assembly attached to the

4-14. The torque converter transmission assembly is

transmission by a propeller shaft.

controlled by a valve on the top of the transmission case.

This valve is attached by linkage to a rod extending

4-9.

TRANSMISSION ASSEMBLY.

through the floor plate and up the steering support

assembly to a hand lever mounted directly below the

4-10. The transmission assembly is the mechanism by

steering wheel. By proper manipulation of the hand

which the operator can determine direction in operation

lever, the operator can place the vehicle in forward,

of the vehicle. The transmission used on the fork lift

reverse, or neutral. A second linkage system connects

truck is a single-speed torque converter transmission

the brake pedal shaft to the inching spool of the

consisting of a torque converter and transmission

transmission control valve. This hook-up allows the

assembly.

operator to speed up the engine for maximum lifting

power while inching into position with a load. Complete

4-11. The purpose of a torque converter is to multiply

control of the vehicle is effected at all times because it is

the torque, or twisting force of the engine to whose

only necessary to depress the brake pedals an additional

output shaft it is applied. The amount of load or

amount to stop inching and apply brakes. A brake pedal

(resistance applied to the output shaft of the torque

is provided for both left and right foot operation.