Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

Tires
Checking Inflation Pressure
Give your tires a visual test every day, and check inflation
with a gauge every week:
• When checking tire pressure, inspect each tire for
damage to sidewalls, cuts, cracks, uneven wear,
rocks between duals, etc. If a tire appears underinflated,
check for damage to the wheel assembly.
Don’t forget to check between dual wheels. If you find
wheel damage, have an expert tire service repair it.
• Maximum tire pressure will be indicated on the sidewall
of a tire.
• Check pressure only when the tires are cool. Warm or
hot tires cause pressure buildup and will give you an
inaccurate reading. So never deflateawarmtiretothe
specified pressure.
• Lower tire pressure does not give you more traction
on ice or snow. This is an old myth that refuses to
die. Underinflation actually reduces traction, steering
control and tire load capacity.
PART 8: MAINTENANCE AND SERVICE
up. Heat causes early tire damage such as flex break, radial
cracks, and ply separation. Low pressure may affect
control of your vehicle, especially at the front wheels. Most
tire wear problems are caused by underinflation as the result
of slow leaks, so you’ll want to check tire pressure regularly.
WARNING! Underinflated tires could cause a serious
accident. The extra heat caused by underinflation
can cause sudden tire failure. Low
pressure may affect control at the front wheels.
You could be seriously hurt in an accident that
could result. Keep your tires inflated to the
manufacturer’s recommended limit.
Overloaded tires
Overloading your truck is as damaging to your tires as underinflation.
The following chart shows how neglect or deliberate
abuse can affect the life of your tires.
Underinflated Tires
Low pressure is a tire’s worst enemy. Underinflation allows
tires to flex improperly, causing high temperatures to build
– 150 – Y53-6015 R(08/07)