Do not lower tire pressure to the extent that damage will result. Restore to
recommended tire pressure immediately after emergency (refer to table 1-7).
(3) If necessary, lower tire pressure as prescribed in table 1-7 to increase traction.
Attempted operation with only one wheel of a driving axle equipped with a tire
chain may result in serious damage to the tire and/or power train.
(4) Tire chains should be used at all times when operating in deep snow, mud, or soft
Do not jam sticks or stones under a spinning wheel. This can cause personnel injury
or wear the tire tread unnecessarily.
(5) If one or more tires become mired, use a companion vehicle to tow or winch the
disabled truck, or jack up the mired wheel and insert planking or matting beneath it.
(6) After operating truck on muddy or snowy surfaces, remove all accumulation of ice,
snow, and mud from the wheels, axles, radiator core, engine compartment, steering knuckles
and arms, air cleaner intake, and electrical connections.
b. Hard Baked Sand. When negotiating hard baked sand, avoid breaking through the crust. A
road bed of canvas or planking should be prepared for short distances.
c. lcy Roads.
(1) General. Skidding and loss of steering control are the chief difficulties encountered
on icy roads or terrain. The driver must know at all times the exact direction in which front
wheels are steering. Because of lack of traction, truck may continue in a straight direction
regardless of which way the wheels are turned, causing the engine to stall, or the rear end may
veer sharply to the left or right.
(2) Skidding. When rear end of truck skids to either right or left, instantly turn front
wheels in the same direction in which rear end is skidding. Decelerate engine, but do not
depress clutch. Apply brakes very gradually.
d. Dusty or Sandy Roads. When operating truck over dusty or sandy terrain, clean air
cleaner and radiator fins daily.
e. Rocks and Boulders. See table 1-7 for proper tire inflation. When operating truck over
rocks and/or boulders, be certain that tires are properly inflated. Overinflation increases the
shock transmitted to the truck, and underinflation can cause internal rupture of tires or damage
to the tube.
When checking tire pressure, do not reduce pressure when tire is hot from driving.