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Replacing Valves
The "snap-in" type rubber valve as used with the 6.70-15
tires should always be replaced by a new valve once it is
removed from a rim.
-
To remove a "snap-in" valve from rim, force a small screw-
driver blade between valve and edge of hole.
Then,
while
prying on valve to start groove out of hole, push the valve back
through the rim.
The one piece "snap-in" valve is installed as follows:
1.
Clean all foreign material from area around valve hole in
rim with steel wool.
2.
Use water or a very light film of tire mounting soap to
lubricate outside of valve.
CAUTION: Do not use oil, grease or hand soap.
3. Insert valve through rim and work into snapped in
po-
sition by using a pair of slip-joint pliers with one jaw
placed on rim and one jaw on base of valve assembly.
CAUTION: Do not attempt to hammer the valve into rim.
Tire
·
Rotation. The rotation of truck tires will minimize tire
trouble and produce longer tire life. Without rotation, accel-
erated and irregular tire wear on any particular tire will
not be spread out over the entire set, and replacement
fre-
quency is boosted.
No definite tire
·
rotation formula is applicable to all trucks
because of the wide range of usage. However, certain funda-
mentals, mixed with experience and observation, will assist
the trucker in reducing tire
costs.
A rotation sequence that moves the front tires to the rear
is a general recommendation. Due to different loading con-
ditions on the wheels, new tires which are broken in on the
front wheels usually produce the greatest overall tire life.
Six wheel trucks with unmatched tires may be
rotated-
by
crossing front tires and by exchanging inner and outer tire
positions on the dual wheels.
The outer tire on a dual wheel will skid or drag on a turn be-
cause of the difference in the turning radii of the inner and
outer tires. This results in faster wear of the outer tire. In
general,
the tire with the largest diameter or least wear should
be at the outside of each dual wheel. In addition, certain truckers
• 70 •
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