MAINTENANCE, LUBRICATION AND SERVICE
TIRES, WHEELS AND HUB
Wheel Nut Tightening
After the initial tightening, retightening
must be made within the rst 800 Km
(500 miles). After the rst retightening,
only normal inspection of nut tightness
is needed.Check front and rear wheel
nut tightness with a torque wrench. All
disc wheels for Mack vehicles have a
tightening torque of 610 Nm (450 lb-ft).
Tighten the nuts in the correct
sequence. Inspect bolts and nuts for
signs of wear or cracks. Make sure that
the bolts are not bent. This tightening
check is particularly important when
rims or brake drums are newly painted.
Paint can ake off from these surfaces,
causing the nuts to lose their grip and
the wheel to loosen.
DANGER
Failure to properly torque-tighten the
wheel nuts can result in the breakage of
wheel studs and the subsequent loss of
wheels. Loss of vehicle control and
serious personal injury or death can occur.
1 1-10 Stud Wheel Nut Tightening Sequence
Tire Wear
WARNING
DO NOT operate the vehicle with under-
inated tires. Always keep your tires
inated to the manufacturers
recommendation. Increased exing in the
tire sidewall produces heat. The heat can
build to the point of blowing the tire out
causing an accident.
WARNING
Check tire pressure when the tire is cold.
Never bleed the air from hot tires.
Increased tire pressure measured in a hot
tire is normal. Low pressures may cause
side wall exing, resulting in increased
heat, leading to tire failure and vehicle
accident.
Remove stones lodged in ribs or in
between double-mounted wheels.
Check the tire pressure and leak-test the
valve stems.
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X Publication_PC28
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