Great Dane Champion CP Maintenance Manual - Page 10
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wheel problems
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RIM BASE CRACKS
Circumferential crack at back flange radius or bead set.
Causes: Overload and/or over inflation, damage due to
tire tools, tire bead deep pitting
or corrosion.
Circumferential cracks in
middle of rim.
Causes: Damage at valve slot
or elsewhere. Disc
weld problem.
Cracks in rim gutter.
Causes: Over inflation,
hammer damage,
or improper cleaning.
Butt weld projection.
Crack across mounting bevel
in a demountable rim.
Causes: Excessive clamping
torque or improper
components.
DISC FAILURES
Cracks at disc nave
and/or handhole.
Causes: Bad fit-up,
damaged hub, or
overload. Sharp
edge at handhole.
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TUBELESS RIM LEAKS.
Circumferential crack
at bead set.
Caused by pitting and
erosion by the tire bead.
Circumferential crack
in well radius.
Caused by overload and
over inflation.
Circumferential crack
at attachment weld.
Caused by overload and
over inflation.
NOTE:
Wheels with well-welded discs may not
be approved for use with radial tires.
Leak at butt weld.
Caused by cracked or
damaged weld.
Leak at valve hole.
Caused by damage or
severe corrosion.
Leak under tire bead,
groove or ridge across
bead seat.
Caused by corrosion,
tire tool marks, bent
flange or other damage.
TIRE CHANGES
1. Check all metal surfaces as listed in the section
Rim and Wheel Inspection and Maintenance.
A more thorough check may be made, however,
after the tire has been demounted. Watch particu-
larly for the damages shown in this section, and
refer to recommendations if corrective measures
are required.
danger
Be sure that replacements are made with the
proper sizes and types of rims and rings.
NOTE:
Openings between ends of split side
rings must not be less than 3/32" except where
the ring design calls for an abutting condition, or
more than 5/16" after ring is seated in during
operation. Split lock rings used with endless side
rings must not butt.
STUD HOLE CRACKS
Hub or outboard drum may be damaged or broken.
Must provide flat backup.
Double-capnut wheel
Crack originating from
mounting preload is force
thin edge of bolt hole.
applied to the disc by
Cause: Damaged or
torquing nuts. Inner cap
worn out chamfers.
nut must be tightened
before tightening outer nut.
This surface should be
convex, not concave.
Nut side.
Worn out nut.
Chamfer extruded on
side opposite nut.
Cause: Too much torque
or improper nut.
tire care
PROPER INFLATION
danger
Always inflate tires in a safety cage.
Inspect trailer tires thoroughly and often, paying special
attention to inflation. Always use a reliable tire pressure
gauge. Always check when the tire is cool, inflating to
the recommended pressure for the maximum load to be
carried but not exceeding the pressure limit molded into
the tire and the rim or wheel rating. Always use valve
stem caps to keep a tight air seal and keep out dirt and
moisture.
Hex nut imprint.
Backup
area
chafed.
Chamfer flared by nut.
Cause: Loose cap nuts or insufficient preload due to
damaged threads or improper torquing or by worn out
nuts.
WHEEL CRACKS
Handhole to handhole.
Handhole to studhole.
Handhole to rim.
Causes: Overloading.
Studhole to studhole.
Causes: Loose cap
nuts.(Also see chamber
problems).
Even with proper inflation, radial tires tend to show a
sidewall bulge normally associated with under inflation.
After mounting a new tire, recheck inflation pressure
after 48 hours.
Inflation pressure increases during normal operation as
tire temperature increases, often as much as 10 to 15
psi. Higher pressure may be a sign of overloading,
under inflation, excessive speed, improper tire size, or a
combination of these factors. Determine the cause of
any abnormal air pressure increase and correct it.
UNDER INFLATION is a tire's greatest enemy. Check
tires with an accurate gauge before each trip and at
least once a week.
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