Komatsu WA470-6 2006, Operation & Maintenance Manual

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3.3 Operation Operation
3-146
WA470-6H – VEAM946100
3.3.15 Handling the tires
Precautions when handling tires
CAUTION
!
If the following defects are found in tyres, they must be
replaced for safety reasons.
!
Bead wire is broken or bent, or the tyre is greatly deformed.
!
Excessive wear and the carcass ply (excluding breaker) is
exposed for more than 1/4 of the circumference.
!
Damage to the carcass exceeds 1/3 of the tire width.
!
Tyre layers are separated.
!
Radial cracks reach the carcass.
!
Deformation or damage which makes the tyre unsuitable for
use.
!
Do not install a tire protector (mesh chain) to the rear tires.
Please contact your KOMATSU distributor when replacing the
tires. It is dangerous to jack up the machine without taking due
care.
Tire pressure
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.
GK032223
Bead
Shoulder
Tread
Breaker or Belt
(cord layer)
Inner liner
Carcass
Side wall
GK032224