Hitachi ZW180 Operator's Manual page 288

Tire Rotation
Rotate tires when uneven or abnormal wear is recognized on
either front or rear, or right and left tire. Tire rotation is recom-
mended to achieve uniformity of wear on tires or equalization
of tire service life.
WARNING: Install tire with no external damage such
as score and abnormal wear. Failure to do so may
cause the puncture or the tire to blowout, possibly
resulting in personal injury or death since tire load is
increased when the machine is loaded or braked dur-
ing operation.
Rotation Procedure
• Switch tires only between the front and rear positions. Do
not switch the tires between diagonal positions.
• Align the tire rotation direction with the tire tread design
pattern. Especially traction tread design pattern (optional)
will affect not only economy of tire but also safety in op-
eration.
How to check wear amount (tread design groove depth):
Measure the groove depth at 1/4 tread width position
[shown with X mark (1) in the figure].
Use limit of the groove depth shall be approx. 85% of the new
tire groove depth. In case extreme uneven wear or exposed
rubbing strips are found, replace the tire even before reaching
85%.
IMPORTANT: If the machine is operated with such tires at
either rear or front being extremely worn
or different in type, construction, or size,
the travel driving system such as axles or
transmission will be adversely affected in
their performance and/or endurance. Avoid
operating the machine under such condi-
tions. When replacing tires, be sure to use
the same tires in type, construction and size
to the four wheels. It is recommended to
replace tires of the four wheels at the same
time.
MAINTENANCE
7-88
(Right)
Front
Tread width
Groove depth
(Wrong)
M4GB-07-104
1
Tread width
M4GB-07-103