MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

Tires and Wheels
damage to the wheel assembly. Do not forget to check
between dual wheels. If you find wheel damage, have an
expert tire service repair it.
WARNING! Do not repair damaged tires unless
you are fully qualified and equipped to do so.
Wheel and tire assemblies cannot be worked on
without proper tools and equipment, such as:
safety cages or restraining devices. Have all tire
repairs performed by an expert. And stand away
from the tire assembly while the expert is working.
CAUTION: Pressure should be checked when
the tires are cool. Warm or hot tires cause pressure
buildup and will give you an inaccurate
reading. So never deflate a warm tire to the
specified pressure.
Underinflated tires will adversely affect the operation of
the vehicle and tires:
• making steering difficult
• causing extra strain on the tire sidewalls
• reducing the tread life of tires due to the high temperatures
generated from excess flexing of the tire
• Inflate tires to the manufacturer's cold air pressure specification
molded into the tire side wall.
Preventive Maintenance
Lower tire pressure does not give you more traction on ice or
snow. Underinflation actually reduces traction and steering
control. See the tire manufacturer's Drivers Handbook for
more information on proper operation and use of tires.
00137a
TREAD CONTACT
WITH ROAD
00138a
00139a
TREAD
CONTACT WITH ROAD
TREAD CONTACT
WITH ROAD
Proper Inflation: the correct
profile for full contact with the
road.
Underinflation: causes abnormal
tire deflection, which builds
up excessive heat, running the
risk of failure. It also causes
irregular wear.
Overinflation: reduces the
tread contact area with the road
surface, concentrating all of the
vehicle weight on the center of
the tread. This causes premature
wear of the tire.
– 174 – PB1318 3/01 Model 330