Chevrolet 4500 HD 2023 Manual page 293

292 Vehicle Care
Danger (Continued)
raised clear of the ground. Do not
start the engine with any rear wheel
in contact with the ground.
If you are not fully experienced on the
procedures to follow, and/or are not
equipped with the proper tools and
equipment, again, do not attempt to
raise the vehicle, or remove or install
the tire and wheel assembly seek
expert tire services.
Do not put air back in a tire that has
been run flat, or is seriously low on
air, without first having the tire taken
off the wheel and the tire checked for
damage.
Note that taking off and mounting
tires on wheels requires proper tools,
safety equipment and special training.
A person can be severely injured or
killed and damage can result from
using the wrong service methods.
Truck tires and wheels should be
serviced only by trained people using
the proper equipment.
Danger (Continued)
Never add air to your tires unless an
accurate pressure gauge is also used.
When putting air in a tire on the
vehicle, stand to the side and use a
clip-on chuck and hose extension. In
choosing the right tire pressure, be
careful not to exceed the maximum
pressure capability shown on the tire;
see the tire pressure charts in this
manual.
Tire mounting or repair can result in
serious personal injury or death, if not
performed correctly. This section has
detailed instructions for proper wheel
and tire replacement, so be sure to
read and follow them. Truck fleet
owners and operators: You can get
written instructions on truck tire
demounting, repair and mounting
from Rubber Manufacturers
Association (RMA), 1400 K Street N.W.,
Washington, D.C. 20005, and also from
many tire stores.
(Continued)
Wheel Nut Torque
Warning
Never use oil or grease on studs or nuts.
Use the torque specified for the type of
wheels on the vehicle. Snug all wheel
nuts and then tighten to the specified
torque in the numerical sequence shown.
Improperly tightened wheel nuts could
eventually allow the wheel to come off
while the vehicle is moving, possibly
causing loss of control and personal
injury and property damage.
When the vehicle, wheel or fasteners are
new, have a technician tighten wheel stud
nuts and rim clamp nuts with a torque
wrench at 1 040 km (650 mi). This is
necessary because the clamping system
used on the wheels must seat before the
fastener will hold a uniform clamp load and
remain fully tightened. Also have a
technician tighten wheel stud nuts and rim
clamp nuts with a torque wrench after
installing any wheel.