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have found when trucks are operated continuously on high
crown roads an increase
in
air pressure of from 5 to 10 pounds
in
the outside tire of each dual produces maximum tire life.
TIRE INFLATION
Tire pressures should be checked at least once a week and
inflated according to the following table.
Avoid underinfl.ation to prevent rim bruises, excessive
heat, and irregular or rapid wear.
A void overinfl.ation to prevent tire ruptures, hard riding,
irregular or rapid wear and reduction of skid resistance.
Valve Caps should always be installed and tightened firmly
to prevent dust and water entering and damaging valve seats.
The caps also act as an air seal.
Inflation Table
Tire Size and
Inflation Pressure
Ply Rating
Pounds Per Square Inch
Front
Rear
6.50-16-6
26
36
6.70-15-4
28
28
6.70-15-6
28
30
7-17.5-6
25
45
7-22.5-6
40
50
7-22.5-8
65
8-17.5-6
30
45
.'
8-17.5-8
60
8-19.5-8
35
1
65
8-22.5-8
40
2
65
9-22.5-8
70
9-22.5-10
40
70
10-22.5-10
40
70
10-22.5-12
75
10n
Models 4100 and 4400 with 12000#G.V.W. and on School Bus
use 40 lbs. per sq. in.
20n Tandem Axle Models use 65 lbs. per sq. in .
• 71 •
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