Section III. PRINCIPLES OF OPERATION - TM-9-2320-366-20-10069

TM 9-2320-366-20-1

1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

Refer to TM 9-2320-366-10-1 for location and description of major components.

1-9. DIFFERENCES BETWEEN MODELS

Refer to TM 9-2320-366-10-1 for differences between models.

Section III. PRINCIPLES OF OPERATION

1-10. POWERTRAIN

Figure 1-12. Powertrain

Power for the vehicle is provided by a diesel engine (1, Figure 1-12) which is coupled directly to an automatic

transmission (2). Power from the automatic transmission is transferred to the transfer case (3) and on to the front

steering and rear drive axles (4, 5, and 6) through a series of drive shafts and universal joints. The vehicle drive train

is enhanced by the use of an electronically controlled seven-speed transmission. The primary components of the

Allison MD3070PT transmission consist of either a WTEC II Transmission Electronic Control Unit (ECU) Pushbutton

Shift Selector (WTEC II TEPSS) or a WTEC III Transmission Pushbutton Shift Selector (WTEC III TPSS) coupled with

a WTEC III transmission ECU; a control module located directly beneath the transmission main housing; a Throttle

Position Sensor (TPS) which detects the percentage of throttle being used; engine, turbine, and output speed sensors

which, in combination with each other, send information to the ECU to provide the smoothest possible shifting and allow

the ECU to monitor overall transmission performance.