Chevrolet 4500 HD 2023 Manual page 236

When Operating the PTO
For operation of special equipment, see the
manufacturer s instructions.
Installations, or alterations to the original
equipment vehicle or chassis, as
manufactured and assembled by General
Motors, are not covered by this warranty.
The body company, assembler,
or equipment installer is solely responsible
for warranties on the body or equipment
and any alterations to any of the parts,
components, systems, or assemblies
installed by GM. Examples include, but are
not limited to, special body installation, such
as recreational vehicles, the installation of
any non-GM part, cutting, welding, or the
disconnecting of original equipment vehicle
or chassis parts and components, extension
of the wheelbase, suspension, and driveline
modifications, and axle additions.
The engine control module (ECM) has the
ability to accommodate one of three
different PTO modes. Each mode can be
programmed to accommodate many PTO
devices. Optional PTO switches are available
from your dealer to ease installation of
a PTO.
The optional PTO main switch and PTO
engine speed control switch can be used to
increase the engine idle r/min without
additional programming. Pressing the PTO
main switch once will activate the PTO
mode and raise the idle up speed up to the
preset 800 r/min. Once in PTO mode the
PTO engine speed control switch can be
used to adjust the idle speeds between the
preset 1,300 and 1,700 r/min. Moving the
selector lever from park or neutral, applying
the brake pedal or releasing the parking
brake will cancel PTO mode and return the
engine idle speed to normal. For additional
details about PTO programming, contact
your dealer.
Driving and Operating 235