33
2009
K
night
Driving & Safety - 2
Understanding the Inflation Table:
The tire size is on the left margin of the table.
Determine the Single or Dual inflation reading,
denoted with a D or S on the Table. Single is
for the front axle. Dual is for the drive axle.
On the following chart, find the corresponding
psi at the top columns to see the corresponding
maximum weight capacity for that psi.
Rated load capacities are listed for individual
tires in a Dual or Single position.
WARNING
Every load range has a maximum
rating as well as a minimum rating.
DO NOT exceed those ratings.
WARNING
DO NOT exceed tire manufacturer
maximum speed rating.
Inspecting & Pressure
Weigh all tire positions separately and use
the tire charts to determine correct tire inflation
pressure. All pressures are rated at a cold psi.
Cold psi is defined as early in the morning
before ambient temperature, sun heat or the
heat generated while driving have caused the
tire pressure to temporarily increase. Check
tire inflation pressure every morning before
driving. Use a quality truck tire gauge with
an angle airhead to ensure access to the dual
wheel positions of the drive axle.
Ensure the valve cap is replaced on the stem
after the inflation pressure is checked. Use
valve stem caps with a positive seal to prevent
air escaping from the valve stem.
If there are extension hoses on the valve
stem, make sure they are good quality
reinforced stainless steel braid. Attach hoses
securely to the outer wheel.
The valve stem cap guarantees the valve core
will remain free of dirt and foreign material.
Material lodged between the valve core and
internal stem can cause slow leaks resulting in
tire failure.
Optimum tire performance is achieved at
proper inflation pressure for the load carried.
DO NOT
mix tires of different tread patterns,
size or construction on the same axle. The
difference in traction could cause rear end gear
bind and mechanical damage to the drive train.
CAUTION
DO NOT let air out of a hot tire.
Over-inflation can cause:
Hard ride.
Tire bruising or carcass damage.
Rapid tread wear in the center
of the tire.
Under-inflation can cause:
Tire squeal on turns.
Separations.
Rapid and uneven wear on the
edges of the tread.
Circumferential breaks.
Tire container may bruise or
rupture.
Higher risk of road hazard.
Tire cord breakage.
Loss of casing durability.
Excessive tire temperature.
High fuel consumption.
Reduced handling quality.
WARNING
A slow leak may go unnoticed on one
of the dual tires. This can cause the
good tire to fail by exceeding the load
limit. Tires with damaged sidewalls
can burst upon inflation. A flat or
nearly flat tire can also generate
enough heat from friction to ignite.
Unequal tire pressures on same axle can
cause:
Uneven braking
Swerve upon acceleration
Steering lead
Torque steer
Reduced handling quality
WARNING
For safety purposes, clear the area of
people and pets during tire inflation.
Inflate tires using a remote inflation
device.
Air Pressure Checklist
When inspecting the tires, confirm
the tires are cool before increasing or
reducing air pressure. Driving a short
distance can heat up tires.
090440b
020161c
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