Komatsu WA480-8 Operation & Maintenance Manual page 289

OPERATION
Deflection ratio = (H − h) / H x100
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 (boom horizontal): Approximately
15 to 25 %
When digging (rear wheels off ground): Approximately 25 to
35 %
In addition to the checking of tire inflation pressure, check for
small cuts and peeling on tires, for sticking of nails and metallic
pieces that may cause punctures, and for any abnormal wear.
Keep the working road surface constantly clean by removing fallen stones. This will extend the tire life and give
improved economy.
• For operations on normal road surfaces, rock digging operations: High end of range in the following table.
• Stock pile operations on soft ground: Average pressure in air pressure chart
• Operations on sand (operations not using much digging force): Low end of range in the following table
If the deflection of the tire is excessive, raise the inflation pressure within the limits given in the following table to
give a appropriate deflection (see deflection ratio).
Tire size
(Pattern)
26.5R25XHA2 (L3:
Rock)
(Standard specification
machine)
26.5-25-20PR (L3:
Rock)
(if equipped)
Stock pile operation means scooping and piling gravel.
PRECAUTIONS FOR LOAD-AND-CARRY OPERATION
When traveling continuously in load-and-carry operation, choose the appropriate tires to match the operating
conditions, or choose the operating conditions to match the tires. If this is not done, the tires will be damaged.
Consult your Komatsu distributor or tire dealer.
H: Free
Ground (sandy
height
ground)
( mm)
Stock pile
Front wheel: 450
{4.5}
492 (ML)
Rear wheel: 350
{3.5}
Front wheel: 420
{4.2}
492 (BS)
Rear wheel: 350
{3.5}
MACHINE OPERATIONS AND CONTROLS
Air pressure [ kPa { kg/cm
Normal road
Stock pile Digging
Front wheel: 450 Front wheel: 450
{4.5}
Rear wheel: 350 Rear wheel: 350
{3.5}
Front wheel: 420 Front wheel: 420
{4.2}
Rear wheel: 350 Rear wheel: 350
{3.5}
2
} ]
When shipped
from the plant
Front wheel: 450
{4.5} {4.5}
Rear wheel: 350
{3.5} {3.5}
Front wheel: 420
{4.2} {4.2}
Rear wheel: 350
{3.5} {3.5}
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