OPERATING IN SNOW (Contd)
Drain off any accumulated water in fuel filter/water separator (1). To drain water from fuel system:
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.
Do not overtighten plastic valve; damage may result and fuel may leak.
On M939A2 series vehicles, loosen drainvalve (5) on bottom of fuel filter/water separator (4) and drain
water into a suitable container. Close drain valve (5) when clean fuel is visible.
If fuel is not clear before approximately one qt (0.946 L) has drained, notify unit maintenance.
After draining has been completed, prime fuel system (para. 3-8).
OPERATING IN EXTREME HEAT
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.
Perform before-operation services in table 2-3.
Check for sand or insects in front of radiator. Blow out obstructions with low compressed air.