OPERATION OPERATION
3-99
HANDLING THE TIRES 3
PRECAUTIONS WHEN HANDLING TIRES 3
CAUTION
If the following defects are found in tyres, they must be
replaced for safety reasons.
q Bead wire is broken or bent, or the tyre is greatly
deformed.
q Excessive wear and the carcass ply (excluding
breaker) is exposed for more than 1/4 of the circumfer-
ence.
q Damage to the carcass exceeds 1/3 of the tire width.
q Tyre layers are separated.
q Radial cracks reach the carcass.
q Deformation or damage which makes the tyre unsuit-
able for use.
Please contact your Komatsu distributor when replacing the tires. It is dangerous to jack up the machine without
taking due care.
TIRE PRESSURE 3
Measure the tire pressure before starting operations, when the tires are cool.
If the tire inflation pressure is too low, there will be overload; if it is too high, it will cause tire cuts and shock burst.
To prevent these problems, adjust the tire inflation pressure according to the table on the next page.
Deflection ratio = H - h / H x 100
As a guideline that can be checked visibly, the deflection ratio
of the front tire (deflection/free height) is as follows.
When carrying normal load (lift arm horizontal): Approx. 15 to
25 %
When digging (rear wheels off ground): Approx. 25 to 35 %
When checking the tire inflation pressure, check also for small
scratches or peeling of the tire, for nails or pieces of metal
which may cause punctures, and for any abnormal wear.
AE40786B-A
Breaker or belt
(cord layer)
Tread
Shoulder
Side wall
Inner liner
Carcass
Bead
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