Golden Dragon XML6125CLE, Repair Manual

Page: 503 / 613

WT-16
Wheel and Tyre
 Tyre troubleshooting
Other than the good driving habits of the driver, some of the most important factors that determine the
soundness of the tyre include tyre pressure, load and speed. Various types of tyre faults and damages are caused by
these three factors. In addition, improper operation of the frame, suspension and axle systems may also cause tyre
faults. For that reason, tyre faults shall be considered from two perspectives.
1. Trouble at tyre crown
 Crown bursting
1) Phenomena: x, Y, / and other irregular bursting at tyre crown.
2) Cause: crown bursts when the over-pressurized tyre is subject to
heavy impacts by an obstacle upon fast and overloaded traveling
of the bus;
3) Precautions: keep an appropriate pressure. Preclude overloading.
Reduce traveling speed on a road with poor surface conditions,
remove the stones embedded in patterns and repair any damage
upon discovery.
 Crown peeling
1) Phenomena: tyre surface becomes coarser and peels off in blocks;
2) Cause: tyre travels on a sand and stone paved road for a long
term so that tyre tread is damaged by sharp stones. Bus brake
control system is in trouble so that tyres are kept in a rolling and
skidding state. Skidding and idle running of the bus;
3) Precaution: keep appropriate tyre pressure, preclude overloading,
reduce traveling speed on a road with poor surface conditions,
remove the stones embedded in patterns and repair any damage
upon detection. Correctly, safely and reasonably steer the bus
and avoid abnormal braking (e.g. emergency braking), or select
tyre patterns and tyres in a reasonable way.
 Crown scratch
1) Phenomena: the crown is scratched tidily and peripherally.
2) Cause: tyres travel on a dry muddy road so that they skid and
tyre treads are tidily scratched by sharp objects.
3) Precaution: pay special attention and slow down when the bus
travels on a muddy road. Preclude overloading, keep a standard
pressure, steer the bus in a correct and reasonable manner and
foster good driving habits.
9-16