TIRE MAINTENANCE MANUAL - Goodyear Off-The-Road (OTR)

leads directly to a higher cost per ton mile
or kilometer.
Overloading may lead to premature tire
failure. If inflation pressure is not adjusted
to heavier loads, tires will become unserviceable
due to:
• Tread and ply separation.
• Disintegration of the carcass and
inner liner (fatigue).
• Radial sidewall cracking.
• Excessive bead chafing.
Overloads with the inflation adjusted to
compensate may exceed the carcass
strength. This will result in:
• Impact breaks and cuts.
• Rapid wear.
• Fabric fatigue (loss of nylon cord or
steel cables strength).
Tires and Operating Conditions
Tires represent one of the major direct expenses
in off-the-road (OTR) equipment
operations.
Regular maintenance will help OTR tires
last longer. Longer life translates directly to
a lower cost per ton-mile.
Every OTR project should have a tire
maintenance program. The program should
be overseen by a team which includes
members from:
• Project Management /Job
Superintendent.
• Engineering Department
Representative.
• Operations/Mining Department.
• Maintenance Department
Representative.
• Tire Department Representative.
Tire company representatives can serve as
a resource for the OTR tire team.
7
Project or Mine Manager and Job
Superintendent Responsibilities
Successful tire cost management and control
begins with top management.
Their involvement in the program will emphasize
its importance. They are also in the
best position to anticipate changes in tire
requirements.
Changes often occur as a project progresses.
For example, hauls may get longer. Higher
speeds or heavier loads may be required to
maintain production. These may require a
change in tires or equipment used.
A keen, dedicated, cost conscious, tirewise
manager or superintendent will be aware of
these ongoing changes. Appropriate tires
and equipment can then be ordered as
needed.
Engineering Department
Responsibilities
Haulroad design plays an important role in
tire cost control. Both tire wear and hazard
exposure can be minimized by proper design.
This is especially true on larger projects
where roads are used for a long time.
Layout and surface condition of the
haulroad affect tire life.
Steep grades, sharp turns, poor superelevation
increase tire slippage resulting in fast,
abrasive tread wear.
Imbedded or loose rocks increase tread cutting,
sidewall cutting, and impact break hazards.
They often lead to speed restrictions
which reduce production. Equipment breakdown
and maintenance costs also increase.