Heavy Haul Trailers
52
4.9.1
Basic Tire Maintenance
Properly maintained tires improve the steering, stopping, traction, and load-carrying capability of
your vehicle. Under inflated tires and overloaded vehicles are a major cause of tire failure. Therefore,
as previously mentioned, to avoid flat tires and other types of tire failure, you should maintain proper
tire pressure, observe tire and vehicle load limits, avoid road hazards, and regularly inspect your tires.
4.9.2
Finding Your Vehicle’s Recommended Tire Pressure and Load Limits
Tire information placards and vehicle certification labels contain information on tires and load limits.
These labels indicate the vehicle manufacturer's information including:
•
Recommended tire size,
•
Recommended tire inflation pressure,
•
Vehicle capacity weight (VCW–the maximum occupant and cargo weight a vehicle is designed
to carry),
•
Front and rear gross axle weight ratings (GAWR– the maximum weight the axle systems are
designed to carry).
Both placards and certification labels are permanently attached to the trailer near the left front.
4.9.3
Tire Inflation
Tire inflation pressure is the level of air in the tire that provides it with load-carrying capacity and
affects the overall performance of the vehicle. The tire inflation pressure is a number that indicates the
amount of air pressure– measured in kilo pascals
(kPa) or pounds per square inch (psi)–a tire requires
to be properly inflated.
Proper and improper tire inflation will produce the
tire section and ground contact characteristics
shown in Fig. 4-9. Tire inflation must be checked
daily while tires are cold. Either over-inflation or
under-inflation will cause premature tire failure.
Caution.
Do not attempt to adjust the inflation
pressure while the tires are hot.
Caution.
Do not exceed the cold inflation pressures. In some cases the rim will have a lower inflation
pressure than the tire, in which case the lower pressure must be used. The maximum inflation
pressure to be used is shown on the certification label. Tire inflation must be checked during road
stops to locate air losses. Also, remove any foreign objects jammed between the dual wheels.
FIG. 4-9.
Tire Inflation
Summary of Contents for H550 Series
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