TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 325 of 481

TM 9-2320-272-10

2-216

a.

Driving Vehicle.

NOTE

• Six-wheel drive is achieved automatically when transfer case

shift lever is placed in low range. In high range, the front-wheel

drive lock-in switch must be engaged to achieve six-wheel drive.

• Use a second vehicle with winch to recover vehicles sunk in

deep mud. Do not spin wheels. Refer to paragraph 2-22 for front

winch operation.

(1)

Place transmission selector lever (2) in 1-5 (drive) and transfer case shift

lever (3) in low range. Place vehicle in motion slowly without causing wheels to spin

or engine to race. Place transfer case shift lever (3) in high range when vehicle is

under way.

(2)

If rear end skidding occurs:

(a)

Turn steering wheel (1) in direction of skid.

(b)

Let up on accelerator pedal (4) and apply brake pedal (5) in a

gradual pumping manner.

b.

After Operation.

(1)

Wash all mud from vehicle as soon as possible.

(2)

If vehicle front winch was used, clean and lubricate. Refer to

LO 9-2320-272-12.

2-37. OPERATING IN DEEP MUD