TM 9-2320-365-34-11-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTSRefer to TM 9-2320-365-10 for location and description of major components.1-9. DIFFERENCES BETWEEN MODELSRefer to TM 9-2320-365-10 for differences between models.Section III. PRINCIPLES OF OPERATION1-10. POWERTRAINFigure 1-5. PowertrainPower for the vehicle is provided by a diesel engine (1, Figure 1-5) which is coupled directly to an automatictransmission (2). Power from the automatic transmission is transferred to the transfer case (3) and on to the frontsteering and rear drive axles (4 and 5) through a series of drive shafts and universal joints. The vehicle drive train isenhanced by the use of an electronically controlled seven-speed transmission. The primary components of the AllisonMD3070PT transmission consist of a control module located directly beneath the transmission main housing; a ThrottlePosition Sensor (TPS) which detects the percentage of throttle being used; and engine, turbine, and output speedsensors which, in combination with each other, send information to the transmission ECU to provide the smoothestpossible shifting and allow the transmission ECU to monitor overall transmission performance. Transmission shiftcontrol is provided by one of two types of pushbutton shift selectors: The WTEC II Transmission ECU Pushbutton ShiftSelector (TEPSS) which contains an integral transmission ECU or the WTEC III Transmission Pushbutton Shift Selector(TPSS) which is coupled to an external transmission ECU.Change 1 1-7
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