77
If a tire has been run under-inflated, check
the wheel for damage to wheel, rim or tire before
adding air.
i CAUTION
DO NOT OPERATE THE VEHICLE WITH
UNDER-INFLATED OR OVER-INFLATED
TIRES. INCORRECT INFLATION CAN
STRESS THE TIRES AND MAKE THE
TIRE AND RIMS MORE SUSCEPTIBLE
TO DAMAGE, FAILURE AND LOSS
OF VEHICLE CONTROL, RESULTING
IN SERIOUS PERSONAL INJURY OR
DEATH.
C. Moisture inside a tire can result
in body ply separation or a sidewall
rupture. During tire inflation,
compressed air reservoirs and lines
must be kept dry. Use well maintained
in-line moisture traps and service them
regularly.
D. Inspect the tires for bulges, cracks,
cuts or penetrations. A tire pressure
check will assist in uncovering hidden
damage. A weekly pressure loss of
4 psi (28 kPa) or more in a tire may
indicate damage and the tire should be
inspected and repaired or replaced.
E. If tires are wearing irregularly, rotate
them and have the vehicle’s alignment
checked to determine the cause
of irregular tire wear. Government
regulations mandate that front axle
tires have no less than 4/32-inch (3
mm) of tread depth when measured at
any point in a major tread groove. The
same rules mandate rear axle tires to
have no less than 2/32-inch (1.5 mm)
of tread depth when measured at any
point in a major tread groove. Check
state or provincial regulations in case
more stringent regulations apply.
Refer to the OEM Operator’s Manuals for
checking tire inflation pressure, front axle
rotation, dual axle rotation and wheel nut
tightening sequence drawings.
F. Tires should be inspected for oil
contamination. Fuel oil, gasoline, and
other petroleum derivatives, if allowed
to contact the tires, will soften the
rubber and destroy the tire.
23. CHECK FOR LOOSE WHEEL
LUG NUTS AND WHEEL
COMPONENTS.
A. Check the wheel nuts or rim nuts for
indications of looseness. Remove all
dirt and foreign material from the
wheel assembly.
Dirt or rust streaks from the stud holes,
metal buildup around the stud holes or out-of-
round or worn stud holes may be caused by loose
wheel lug nuts.
B. Replace broken, cracked, badly worn,
bent, rusty or sprung rings and rims.
Be sure that the rim base, lock-ring and
side ring are matched according to the
size and type.
i IMPORTANT
REFER TO THE OEM OPERATOR’S
MANUALS FOR REMOVING DUAL
WHEEL ASSEMBLY NUTS AND FOR
TIGHTENING SEQUENCE.
i CAUTION
HAVE WORN OR DAMAGED WHEEL
COMPONENTS REPLACED BY
QUALIFIED PERSONNEL USING
THE WHEEL MANUFACTURER’S
INSTRUCTIONS AND THE WHEEL
INDUSTRY’S STANDARD SAFETY
PRECAUTIONS.
13 MAINTENANCE CHECKLISTS
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