MAINTENANCE AND LUBRICATION
4-23
Figure 4-13: Tire Inflation Examples
Tire Maintenance
Tire Inflation
Tire inflation will cause tire to ground contact
characteristics as shown in
Figure 4-13.
Tire inflation
should be checked daily while the tire is cold, and during
road stops. Checking the tire pressures while tires are
hot will give a faulty increased pressure reading.
Adjusting tire air pressure to the specified amount while
tires are hot will produce improper tire to road contact
and thus abnormal wear. Do not exceed cold inflation
pressure listed on the semitrailer VIN plate located on the
front of the semitrailer. Exceeding cold inflation pressure
will result in damaged tire bodies, rims, and wheels.
Replace all valve stem caps when pressure
checking/adjusting has been completed. Remove any
foreign objects from between duals.
Tire Matching
Both tires on the same spindle must be the same size in
order to properly distribute the load and braking forces
between them. The tire must be mounted on a rim and
properly inflated before measuring. If there is an
allowable difference in size the smaller tire should be
mounted to the inside position of the duals.
Tape Measuring Method
Measure around each tire on the tread surface. A
maximum difference of 3/4” is allowed between the two
mating tires of a dual
Straight Edge or String Method
(This method can not be used if tire and wheel
assemblies are not mounted on the axle.) Jack
semitrailer up until the wheels are off of the ground. Hold
a straight edge against the tires of both ends of an axle. A
gap at one tire indicates a smaller tire. A maximum of
1/8” gap is allowed
Figure 4-14: Measuring Tape Method
Figure 4-15: Straight Edge Method
straightedgemethod
STRAIGHT EDGE
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