between the face cover and the liner. Make cer-
tain the detachable view cover is centered on
the face cover, and the Velcro strips are
pressed firmly in place.
2.
Inspect each tire for the following:
•
valve stem caps on every tire, screwed on
finger-tight
•
bulges, cracks, cuts, and penetrations
•
oil contamination (petroleum derivatives will
soften the rubber and destroy the tire)
•
tread depth—if tread is less than 4/32 inch
(3 mm) on any front tire, or less than 2/32
inch (1.5 mm) on any rear tire, replace the
tire
•
debris lodged between duel tire sets
IMPORTANT: Low-rolling resistance (LRR) tires
minimize wasted energy as a tire rolls, thereby
decreasing rolling effort and improving fuel effi-
ciency. If tire replacement is necessary, replace-
ment tires must meet or exceed the rolling resis-
tance of the originally installed tires in order to
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
for
additional information and resources.
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.
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.
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. Check
the wheel nuts or rim nuts for indications of
looseness.
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.
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.
4.2
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.
Pre- and Post-Trip Inspections and Maintenance
21.3
Summary of Contents for 108SD
Page 1: ...Driver s Manual 108SD and 114SD Part Number STI 496 Publication Number STI 496 6...
Page 60: ...7 Climate Control Climate Control Panel 7 1...
Page 65: ...8 Cab Features Cab Amenities 8 1 Mirrors and Windows 8 1...
Page 121: ...15 Drive Axles Differential Lock Drive Axles 15 1 Interaxle Lock Tandem and Tridem Axles 15 2...
Page 125: ...16 Steering System Power Steering System 16 1...
Page 179: ...05 13 2009 f545526 Fig 23 3 Headlight Adjusting Headlight Aiming 23 3...
