SECTION 13: WHEELS, HUBS AND TIRES
PA1621 Maintenance Manual All Series | January 2017
27
Apply decal facing the valve.
#651091 ENGLISH #651090 BILINGUAL
15. TIRE MAINTENANCE
The most critical factor in tire maintenance is
proper inflation (Figure 33). No tire is impervious
to loss of air pressure. To avoid the hazards of
under inflation, always maintain tires at their
recommended inflation pressure. Improper
inflation decreases tire life.
NOTE
VIP & Converted Bus Shells vehicles are not
at their maximum weight before their
conversion and tire pressures are adjusted at
lower level than the maximum allowed
appearing on the DOT plate.
Tires pressure
must be re-adjusted once converted.
An under inflated tire builds up heat that can
cause sudden tire destruction, resulting in
improper vehicle handling and possible loss of
vehicle control. At least once a week, before
driving (when tires are cold), check inflation
pressure on all the tires, including the spare tire.
This is especially important in cases when
different drivers operate the vehicle.
WARNING
Failure to maintain correct tire inflation
pressure may result in sudden tire destruction,
improper vehicle handling, and will cause
rapid and irregular tire wear. Inflation pressure
should be checked weekly and always before
long distance trips.
15.1 INFLATION PRESSURE
ï‚· Vehicles equipped with BERU TPMS
On vehicles equipped with the Beru Tire
Pressure Monitoring System (TPMS), it is better
to use the TPMS display as the primary
reference to judge when tire pressure need
adjustment.
The TPMS presents pressure readings of each
tire as a +/- deviation from the wanted target.
If a tire reads within +/- 3 PSI no adjustment is
needed.
If a tire reads -4 PSI and below, re-inflate by the
marked amount.
If a tire reads +4 PSI and above , deflate by the
marked amount.
NOTE
Relying on the TPMS system is better than
relying on a hand gage since the TPMS is
temperature compensated and remain
accurate no matter if the tires are cold or hot.
Tires take up to 3 hours to get down to ambient
temperature after a ride. A common mistake
consist of checking pressure while the tires have
not fully cooled down which leads into under-
inflated tires. Relying on the TPMS eliminates
this mistake.
Running tires at optimal pressure reduces tire
wear, improving safety and fuel economy.
The TPMS target pressures are factory set to
equal the prevailing tire pressure at delivery
time.
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