Skytrak 6042 Service Manual User Manual download pdf (Page 181)

6.3

Model 6042 Legacy Origin 7/02

Transmission: ZF 4 WG-98 TC

6.2 TRANSMISSION DESCRIPTION

Instructions in this section pertain mainly to general

specifications, towing, maintenance information, and

transmission removal and installation procedures. Internal

transmission service instructions and detailed specifications

are provided in the ZF 4 WG-98 TC Transmission Repair

Manual, OmniQuip P/N 8990455 (ZF P/N 5871 135 002).

The ZF 4 WG-98 TC Transmission used in this vehicle is

a four-speed configuration. The “intermediate drop”

designation refers to the relative top-to-bottom length of

the transmission case, chosen for its compatibility with

vehicle chassis and operating requirements. Intermediate

drop does not refer to an operational rpm shift or drop.

6.3 TRANSMISSION OPERATION

The transmission is mounted to the frame by front and

rear mounting brackets and rubber isolator pads. Power

from the engine is transmitted to the transmission by

means of a drive shaft, bolted to the engine flywheel and

a torque converter at the transmission input. The

transmission in turn transmits power to the drive shafts,

driving the front and rear axles.

The torque converter consists of three main components:

the impeller (driver), stator and turbine (driven) in an oil-

filled, enclosed housing. As the torque converter is driven

by the engine flywheel, the impeller (pump) wheel

rotates, forcing oil through the stator, which is held

stationary by the stator shaft bolted to the transmission

housing. This directs the moving oil onto the vanes of the

turbine (driven) wheel, causing the turbine wheel to rotate.

The turbine wheel is connected to the transmission input

shaft, and transfers power to the transmission. Oil from

the turbine wheel is then returned to the impeller wheel to

repeat the process. This process results in an increase in

the torque available at the transmission input shaft.

The transmission and torque converter are powered by

their own internal hydraulic (“transmission fluid”) systems,

separate from the vehicle hydraulic system. Pressurized

oil for the valve control circuits and torque converter is

supplied by a pump located at the rear of the

transmission. The pump is driven by the central shaft,

which in turn is connected to the impeller of the torque

converter. The transmission is equipped with an external

oil cooler, mounted in the engine heat exchanger (radiator).

The transmission gear (“speed”) select lever, an electric

shift control, is located on the left side of the steering

column in the operator’s cab. Movement of the gear

select lever energizes the selected transmission shift

solenoid valves, which, in turn, direct the transmission

fluid under pressure to the selected forward or reverse

valve and to the designated range (gear or “speed”)

clutch. Several factors, including terrain, loading, engine

rpm, axle/wheel-end gearing and the selected

transmission gear, determine actual vehicle speed.

To engage the clutch, the gear select lever is placed in

the desired direction (forward or reverse) and range (gear

or “speed”) position. The gear select lever movement

energizes the selected direction and range (gear)

solenoids, allowing transmission fluid under pressure to

flow through tubes and passages to the selected clutch

shafts. Oil sealing rings are located on the clutch shaft;

these rings direct oil under pressure through a drilled

passageway in the shaft to a desired clutch. Hydraulic

pressure forces the piston and discs against the back-up

plate. Discs, with edge tangs, clamp against toothed

discs on the inner diameter, enabling the hub and the

clutch shaft to lock together and drive as a unit, providing

output power.

6.4 TRANSMISSION SERIAL NUMBER

The transmission serial number plate (Fig. 6-1, 1) is

located on the pump side (front) of the transmission at the

bottom right, toward the vehicle frame. Information

specified on the serial number plate includes the

transmission model number, the transmission serial

number and other data. Information on the serial number

plate is required in correspondence regarding the

transmission.

Figure 6-1 Transmission Serial Number Plate Location

WARNING: DO NOT service the vehicle

without following all safety precautions as

outlined in the “Safety Practices” section of this

manual. Failure to follow the safety practices

may result in death or serious injury.

MA8940

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Skytrak 6042 Service Manual User Manual Page 181

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