freightliner cascadia Driver Manual page 188

Pre- and Post-Trip Inspections and Maintenance
maintain compliance with greenhouse gas and
full efficiency regulations (GHG14).
Contact your tire manufacturer/supplier to deter-
mine the rolling resistance of the originally in-
stalled tires. Visit www.epa.gov/smartway
additional information and resources.
3. Check tire inflation.
For inflation pressures and maximum loads, see
the tire manufacturer's guidelines. Inflate the tires
to the applicable pressures if needed.
If a tire has been run flat or under-inflated, check
the wheel and tire for damage before adding air.
Keep compressed air reservoirs and lines dry
during tire inflation. Use well-maintained inline
moisture traps and service them regularly.
WARNING
Do not operate the vehicle with underinflated or
overinflated tires. Incorrect inflation can stress
the tires and make the tires and rims more sus-
ceptible to damage, possibly leading to rim or
tire failure and loss of vehicle control, resulting
in serious personal injury or death.
NOTICE
A weekly pressure loss of 4 psi (28 kPa) or more
in a tire may indicate damage. The tire should be
inspected and, if necessary, repaired or replaced
by a qualified tire service facility.
IMPORTANT: The load and cold inflation pres-
sure must not exceed the rim or wheel manu-
facturer's recommendations, even though the
tire may be approved for a higher load inflation.
Consult the rim or wheel manufacturer for the
correct tire inflation pressure for the vehicle
load.
4. Examine each rim and wheel component.
4.1
Remove all dirt and debris from the as-
sembly. Rust streaks or metal build-up
around stud holes, or out-of-round or worn
stud holes, may be caused by loose wheel
nuts.
21.3
Have any worn or damaged wheel components
replaced by a qualified person using the wheel
manufacturer's instructions and the wheel indus-
for
try's standard safety precautions and equipment.
Otherwise a vehicle or workshop accident could
occur, possibly resulting in serious personal in-
jury or death.
4.2 Inspect for broken, cracked, badly worn,
bent, rusty, or sprung rings and rims.
Use the recommended torque values and follow
the proper tightening sequence. Insufficient
wheel nut torque can cause wheel shimmy, re-
sulting in wheel damage, stud breakage, and ex-
treme tire tread wear. Excessive wheel nut torque
can break studs, damage threads, and crack
discs in the stud hole area.
4.3 Make sure all wheel nuts are tightened. If
tightening is necessary, use the tightening
pattern in
flange nuts to 50 to 100 lbf·ft (68 to 136
N·m). Then tighten the flange nuts to 450
to 500 lbf·ft (610 to 678 N·m).
3
5
04/30/2007
Fig. 21.4, Tightening Pattern, 10-Hole Wheels
5. Inspect the outboard side of all wheel hubs and
the hub oil seal area on the inboard side of each
wheel for signs of oil leakage. If any oil is found
WARNING
NOTICE
Fig. 21.4 to initially tighten the
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