ENGINE AND DRIVE TRAIN

TM 9-2320-270-20-1

ENGINE AND DRIVE TRAIN - CONTINUED

Propeller Shafts There are five shafts in the driveline. Each shaft is used to send turning power from

one component (such as the main transmission) to another component (such as the auxiliary

transmission).

Auxiliary Transmission The two-speed auxiliary transmission has two sets of gears. When set in low

speed, the power is sent through the gears to give a reduced power ratio. When set in high gear, the

power is sent directly through to give the same power ratio.

Transfer Case The transfer case provides output for driving both the front and rear axles. The turning

power from the input shaft is dropped down to the output shaft by an intermediate gear. A planetary

differential splits up the power and sends 30 percent to the front axle shaft and 70 percent to the rear

axle shaft. When the clutch is set, the differential action is locked out and the power is split 50 percent

to the front axle shaft and 50 percent to the rear axle shaft.

Axle Differentials There is one front axle differential and two rear axle differentials. When the vehicle

is driving in a straight direction, the differentials split the input power and send 50 percent to the right

wheels and 50 percent to the left wheels. When the vehicle is turning, the differentials send more

power to the outside wheels than to the inside wheels.

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