Medium Duty Operator's Manual - Peterbilt Motors Company
Medium Duty Operator's Manual - Peterbilt Motors Company Medium Duty Operator's Manual - Peterbilt Motors Company
Tires and Wheels Tire Inflation Most tire wear problems are caused by underinflation as the result of slow leaks. So you will want to check tire pressure regularly. Give the 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 dual wheels (tires), etc. If a tire appears underinflated, check for 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. Preventive Maintenance 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. 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 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. – 202 – Y53-6008A Medium Duty (R05/09)
Preventive Maintenance 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. • Too much air pressure reduces the tire tread contact area and results in rapid wear in the center of the tire. It also causes tires to run hard and makes them more vulnerable to impact and other road hazard damage. 00139a TREAD CONTACT WITH ROAD WARNING! Overinflated tires can cause accidents. They wear more quickly than properly inflated tires and are more subject to punctures, cracks, and other damage. They could fail and cause you to lose control of your vehicle resulting in an injury accident. Be sure all tires are inflated correctly according to the manufacturer's recommendations. Tires and Wheels If overinflation is noted during travel, do not deflate tires. The increased pressure is caused by temperature build-up during operation. This condition has been taken into account during manufacturing of the tires. Allow tires to cool, then recheck and adjust if necessary. Tire Loading WARNING! Do not exceed the load rating of your tires (molded on the side wall of your tire) or the maximum vehicle load rating, whichever is less. Overloading could result in premature tire failure causing you to loose control of your vehicle and result in an injury accident. The maximum vehicle load rating (GVWR) is found on the Tire and Rim Data label on the driver's door. Overloading your vehicle is as damaging to the tires as underinflation. It significantly affects the expected life (total mileage of a tire). The following chart shows how neglect or deliberate abuse can affect the life of your vehicle's tires. Table 6 Effect of Load Pressure on Tire Life Vehicle Load Normal 20% Over 40% Over 60% Over 80% Over 100% Over Tire Pressure Normal 20% Low 30% Low 35% Low 45% Low 55% Low Expected Total Tire Mileage Normal 70% 50% 40% 30% 25% Medium Duty (R05/09) Y53-6008A – 203 –
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- Page 210 and 211: Tires and Wheels Wheel and Tire Rep
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Tires and Wheels<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 />
Preventive Maintenance<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 />
– 202 – Y53-6008A <strong>Medium</strong> <strong>Duty</strong> (R05/09)
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