TM-9-2320-428-10

TRUCK, CARGO, 8X8, M977

TECHNICAL MANUAL; OPERATOR'S MANUAL

JUNE 2009

TM-9-2320-428-10 - Page 130 of 1072

AUTOMATIC TRANSMISSION - Continued

Figure 2.

Drive (D) is used for all normal driving conditions.

The vehicle will start moving in 1st gear, and as the accelerator is depressed, transmission

will upshift to 2nd gear, 3rd gear, and 4th gear automatically.

As the vehicle slows down, the transmission will downshift to the correct gear automatically.

Placing the range selector lever in the 3 or 2 position will prevent the transmission from

upshifting past the 3rd or 2nd gear, respectively.

This is useful if road or load conditions require low gear operation.

When conditions improve, the range selector lever can be returned to the normal (D) driving

position.

Drive vehicle (Operations under usual conditions) (WP 0050) provides full operating

instructions for the transmission.

The transmission includes an electrically controlled power takeoff (PTO).

The PTO provides power to a hydraulic pump, which powers the vehicle's hydraulic system.

The hydraulic system operates the self-recovery winch, the material handling crane, the

heavy-duty recovery winch, and the pumping equipment, depending on how the vehicle is

equipped.

TRANSFER CASE

The transfer case (1) connects the drivetrain to the No.1 and No. 2 axles (2) when 8-wheel

drive is needed.

TM 9-2320-428-10

0012

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