TM 9-2320-365-20-1
1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
Refer to TM 9-2320-365-10 for location and description of major components.
Section III. PRINCIPLES OF OPERATION
1-10. POWERTRAIN
Figure 1-5. Powertrain
Power for the vehicle is provided by a diesel engine (1, Figure 1-5) 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 and 5) 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 a control module located directly beneath the transmission main housing; a Throttle
Position Sensor (TPS) which detects the percentage of throttle being used; and engine, turbine, and output speed
sensors which, in combination with each other, send information to the transmission ECU to provide the smoothest
possible shifting and allow the transmission ECU to monitor overall transmission performance. Transmission shift
control is provided by one of two types of pushbutton shift selectors: The WTEC II Transmission ECU Pushbutton Shift
Selector (TEPSS) which contains an integral transmission ECU or the WTEC III Transmission Pushbutton Shift Selector
(TPSS) which is coupled to an external transmission ECU.
1-7
1-9. DIFFERENCES BETWEEN
MODELS
Refer to TM 9-2320-365-10 for differences between models.
