Medium Duty Operator's Manual - Peterbilt Motors Company

Preventive Maintenance
Speed Restricted Tires
WARNING! This vehicle may be equipped with
speed restricted tires. Check each tire’s sidewall
for maximum rated speed. Vehicle should
not be operated at sustained speed in excess
of maximum rated speed. Failure to comply
with these speed restrictions could cause
sudden tire failure which can result in property
damage or personal injury.
Tire Inspection and Replacement
Visually inspect your tires frequently for any abnormal conditions
such as scrapes, bulges, and uneven wear. This must
be done immediately after known or suspected contact with
an object in the road, with a pothole, road irregularity or after
severe braking. Refer these conditions to an Authorized Tire
Service Center for repair or replacement. Never drive on a
tire if such conditions appear.
If the tire looks underinflated, stand off to the side and check
for damage to the wheel assembly. This can be done by visually
comparing the wheel in question to other wheels on the
Tires and Wheels
vehicle. For dual wheel assemblies, check between the
wheels for damage. If any damage is found, or you suspect
damage, do not attempt further repair. Call for expert tire service.
Tire Inflation and Loading
Low pressure is a tire's worst enemy. Underinflation allows
tires to flex improperly, causing high temperatures to build up.
Heat causes early tire damage such as flex break, radial
cracks, and ply separation. And low pressure may affect control
of your vehicle, especially at the front wheels.
WARNING! Do not operate vehicle with underinflated
tires. The extra heat caused by underinflation
can cause sudden tire failure such as a tire
fire or blow out. Low pressure may affect control
at the front wheels, which could result in an accident
and serious injury. Keep your tires inflated
to the manufacturer's recommended air pressure.
Medium Duty (R05/09) Y53-6008A – 201 –