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 324 of 481

TM 9-2320-272-10

2-215

CAUTION

Do not overtighten plastic valve; damage may result and fuel may

leak.

(b)

On M939A2 series vehicles, loosen drainvalve (5) on bottom of fuel

filter/water separator (4), drain water into suitable container, and close drainvalve

(5) when clean fuel is visible.

(c)

If fuel is not clear before approximately one qt (0.946 L) has drained,

notify unit maintenance.

(d)

After draining has been completed, prime the fuel system (para. 3-8).

b.

Driving Vehicle.

(1)

Do not spin wheels when placing vehicle in motion in heavy rain or

muddy conditions. If necessary, place transfer case shift lever (7) in low range and

transmission selector lever (6) in 1-3 (third) to obtain a slow, firm start.

WARNING

Pump brakes gradually when slowing or stopping vehicle on wet

pavement. Sudden stops will cause vehicle wheels to lock, engine

to stall, and loss of power steering. Failure to do this may result in

injury or death.

(2)

Deflate tires to 25 psi (172 kPa) only when operating off-the-road in

heavy rain. Inflate tires immediately to correct pressure when operation changes to

paved roads. Refer to table 1-10 for tire inflation data. Refer to paragraph 3-11 for

inflating tires using vehicle air system.

(3)

On M939A2 series vehicles, select SAND (9) on control panel (8). This

will automatically deflate tires unless 20 mph (32 km/h) is exceeded (15 mph (24

km/h) on M936A2 wrecker)) for more than two minutes. CTIS will automatically

inflate to cross-country pressure.

2-36. OPERATING UNDER RAINY OR HUMID CONDITIONS (Contd)