Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Preventive Maintenance<br />
Tire Inflation<br />
Most tire wear problems are caused by underinflation as the<br />
result of slow leaks. So you will want to check tire pressure<br />
regularly. Give the tires a visual test every day, and check<br />
inflation with a gauge every week.<br />
When checking tire pressure, inspect each tire for damage to<br />
sidewalls, cuts, cracks, uneven wear, rocks between dual<br />
wheels (tires), etc. If a tire appears underinflated, check for<br />
damage to the wheel assembly. Do not forget to check<br />
between dual wheels. If you find wheel damage, have an<br />
expert tire service repair it.<br />
WARNING! Do not repair damaged tires unless<br />
you are fully qualified and equipped to do so.<br />
Wheel and tire assemblies cannot be worked on<br />
without proper tools and equipment, such as:<br />
safety cages or restraining devices. Have all tire<br />
repairs performed by an expert. And stand away<br />
from the tire assembly while the expert is working.<br />
CAUTION: Pressure should be checked when<br />
the tires are cool. Warm or hot tires cause pressure<br />
buildup and will give you an inaccurate<br />
reading. So never deflate a warm tire to the<br />
specified pressure.<br />
Tires and Wheels<br />
Underinflated tires will adversely affect the operation of<br />
the vehicle and tires:<br />
• making steering difficult<br />
• causing extra strain on the tire sidewalls<br />
• reducing the tread life of tires due to the high temperatures<br />
generated from excess flexing of the tire<br />
• Inflate tires to the manufacturer's cold air pressure specification<br />
molded into the tire side wall.<br />
Lower tire pressure does not give you more traction on ice or<br />
snow. Underinflation actually reduces traction and steering<br />
control. See the tire manufacturer's Drivers Handbook for<br />
more information on proper operation and use of tires.<br />
00137a<br />
TREAD CONTACT<br />
WITH ROAD<br />
00138a<br />
TREAD<br />
CONTACT WITH ROAD<br />
Proper Inflation: the correct<br />
profile for full contact with the<br />
road.<br />
Underinflation: causes abnormal<br />
tire deflection, which builds<br />
up excessive heat, running the<br />
risk of failure. It also causes<br />
irregular wear.<br />
<strong>Medium</strong> <strong>Duty</strong> (R10/06) Y53-6008 – 171 –
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