freightliner Columbia Driver Manual page 155

Pretrip and Post-Trip Inspections and Maintenance
correct tire inflation pressure for the vehicle
load.
3. Examine each rim and wheel component.
3.1 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.
WARNING
Have any worn or damaged wheel components
replaced by a qualified person using the wheel
manufacturer's instructions and the wheel indus-
try's standard safety precautions and equipment.
Otherwise a vehicle or workshop accident could
occur, possibly resulting in serious personal in-
jury or death.
3.2 Inspect for broken, cracked, badly worn,
bent, rusty, or sprung rings and rims.
NOTICE
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.
3.3 Make sure all wheel nuts are tightened. If
tightening is necessary, use the tightening
pattern in Fig. 11.4
tighten the flange nuts 50 to 100 lbf·ft (68
to 136 N·m). Then tighten the flange nuts
450 to 500 lbf·ft (610 to 678 N·m).
4. 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
on wheel and tire or brake components, remove
the vehicle from service until the leak has been
fixed.
If needed, fill the hubs to the level indicated on
the hub cap. See Group 35 of the Columbia
Maintenance Manual for recommended lubri-
cants.
5. Check that mud flaps are undamaged and hang
10 inches (25 cm) or less from the ground.
11.5
or Fig. 11.5 to initially
10
3
5
7
04/30/2007
Fig. 11.4, Tightening Pattern, 10-Stud Disc Wheel
1
7
5
3
03/08/2012
Fig. 11.5, Tightening Pattern, 8-Stud Disc Wheel
Saddle Tank Areas Inspection
WARNING
When draining the air reservoir, do not look into
the air jets or direct them toward anyone. Dirt or
sludge particles may be in the airstream and
could cause injury.
NOTICE
If the water drained from the air reservoirs is
cloudy or oily, it may indicate a problem with the
compressor. If oil is allowed to contaminate the
1
8
6
4
9
2
f400268
2
4
6
8
f400052a