POWERTRAIN - continued - TM-9-2320-391-100078

TM 9-2320-391-10

M1078A1 SERIES THEORY OF OPERATION -

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POWERTRAIN Continued

2. The transmission defaults to Neutral (N) whenever the master power switch is

positioned to off. When the master power switch is positioned to on, the mode

indicator will illuminate briefly on the WTEC III TPSS. The mode indicator will go out

and N will appear in the display window. This lets you know that the transmission is in

highway mode and Neutral (N) range.

3. The Drive (D) gear selection is used for normal driving conditions. The transmission

will engage 2nd gear when D is selected and the vehicle is stopped. The WTEC III

TPSS display window will illuminate 7, indicating the highest available gear. Low gear

(1st gear), is available only through manual selection by pressing the down arrow

button until 1 is displayed in the display window. You may manually downshift or

upshift to a lower or higher gear range as required. The transmission will not

downshift to a lower gear if the engine speed is too high for the gear selected.

Selecting a specific gear, for example 3rd, will prevent the transmission upshifting

past the selected gear.

4. Until MODE is pressed on the WTEC III TPSS, the vehicle is operating as a 2 x 4

vehicle. When MODE is pressed, the mode indicator will illuminate and the vehicle is

operating as a 4 x 4 (all-wheel drive) vehicle. If the vehicle is stopped, the display

window will illuminate 5, indicating that 5th gear is the highest available gear. This

off-road mode is useful if road or load conditions require the use of a lower gear

range for maximum torque. The vehicle must be completely stopped and engine

operating at idle speed before the transmission will allow you to shift from a forward

gear to Reverse (R) gear.

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