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 319 of 481

TM 9-2320-272-10

2-210

(4)

Drain off any accumulated water in fuel filter/water separator (1).

To drain water from fuel system:

(a)

On M939/A1 series vehicles, open drainvalves (2) and (3) on fuel

filter/water separator (1), and drain water into suitable container. Close drainvalves

(2) and (3) when clear fuel is visible.

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) and drain water into a suitable container. 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.

(5)

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

a.

General.

Extreme heat exists when outside temperature reaches 95°F (35°C)

or more. The effect of extreme heat on vehicle engine is a decrease in efficiency.

Operators must adjust driving to conditions.

b.

Before Operation.

(1)

Perform before-operation services in table 2-3.

(2)

Check for sand or insects in front of radiator. Blow out obstructions with

low compressed air.

2-34. OPERATING IN EXTREME HEAT

2-33. OPERATING IN SNOW (Contd)