TRANSMISSION ASSEMBLY

TRANSMISSION ASSEMBLY

The transmission and hydraulic torque portion of the power train enacts an important role in transmitting engine power to

the driving wheels. In order to properly maintain and service these units it is important to first understand their function

and how they operate.

The transmission and torque converter function together and operate through a common hydraulic system.

It is

necessary to consider both units in the study of their function and operation.

To supplement the text below, and for reference use therewith, the following illustrations are provided:

Basic Design Silhouette

Fig.

Converter Assembly

Fig.

Converter and Transmission Case Group

Fig.

Three Speed Case and Clutch Group

Fig.

Clutch Group

Fig.

Regulating Valve, Charging Pump and Filter Group

Fig.

Control Valve

Fig.

Axle Disconnect and Mechanical Parking Brake

Fig.

Typical 28000 Cross Section

Fig.

External Plumbing Diagram

Fig.

Typical Three-Speed Power Flow

Fig.

Clutch and Gear Arrangement

Fig.

Ring Gear Installation

Fig.

Shielded Bearing Installation

Fig.

The R, HR, and MHR Model Transmissions are of three basic designs.

The R Model consists of a separate torque converter, mounted to the engine with the powershift transmission remotely

mounted and connected to the torque converter with a drive shaft.

The HR Model consists of a torque converter and powershifted transmission in one package mounted directly to the

engine.

The MHR version Is a mid-mount torque converter and transmission assembly connected to the engine by means of a

drive shaft. (See Fig. A for basic design silhouette.)

The shift control valve assembly may be mounted directly on the side of the converter housing or front transmission

cover, or remote mounted and connected to the transmission by means of flexible hoses. The function of the control

valve assembly is to direct oil under pressure to the desired directional and speed clutch. A provision is made on certain

models to neutralize the transmission when the brakes are applied. This is accomplished through use of a brake

actuated shutoff valve. The speed and direction clutch assemblies are mounted inside the transmission case and are

connected to the output shaft of the converter either by direct gearing or drive shaft. The purpose of the speed or

directional clutches is to direct the power flow through the gear train to provide the desired speed range and direction.

An axle disconnect is optional and is located on the output shaft. The drive to the front or rear axle can be disconnected

or connected by manual shifting.