GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual page 334

Warning (Continued)
and new loads or inflation
pressures could be placed on
the same vehicle.
Maintaining the correct amount
of air pressure is a very
important maintenance practice
to ensure safe vehicle operation
and long life for the tires.
Failure to maintain correct
inflation pressure may result in
sudden tire destruction,
improper vehicle handling, and
may cause rapid and irregular
tire wear. Therefore, inflation
pressures should be checked
daily and always before
long-distance trips.
Underinflation
Do not allow tires to become
underinflated. Increased flexing
due to underinflation causes
heat buildup within the tire
components. This leads to
reduced strength, breakdown of
the rubber compounds and
possible separation of the tire
components (such as ply and
tread separation and reduced
retreadability).
Underinflation is also the
primary cause of blowouts. In
addition, low inflation causes an
increase in rolling resistance.
This results in reduced fuel
mileage, a loss in tread life, and
uneven wear due to increased
tread movement. To determine
proper inflation, refer to the tire
inflation range stated on the tire
sidewall and the tire
manufacturer s tire
load-pressure charts.
Checking Inflation
Check the tires daily and always
before long-distance trips
Follow the tire manufacturer s
recommended cold inflation
pressure for the tire size, type,
Vehicle Care
load range (ply rating), and axle
loading typical for your
operation. Each steer axle tire
load will equal one-half the steer
axle loading; each drive tire load
will be one-quarter the axle
loading, if fitted with four tires.
Always check the inflation
pressure when the tires are cold.
Never bleed air from hot tires to
relieve normal pressure buildup.
Normal increases in pressure
during operation will be 69 to
103 kPa (10 to 15 psi), which is
allowable in truck tires. Tires on
the same axle should have the
same air pressure as the
corresponding other tire(s) on
that axle. All tires on the
steering axle should be within
21 kPa (3 psi) of each other. All
drive axle tires should be within
34 kPa (5 psi) of each other.
To minimize rim corrosion, it is
important to keep moisture from
the inside of tires and proper
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