Peterbilt 579 - Operating the Engine; Stationary PTO Operation; Engine Fan Control

OPERATING THE ENGINE
OPERATING THE
ENGINE
Stationary PTO Operation
The cruise control buttons for this
vehicle may be used to control the
engine rpm when the vehicle is
stationary and the operator wants to
use the PTO on the engine. Use the
cruise control options in the same
manner as with the vehicle in motion,
but instead of setting vehicle speed,
the engine speed (RPM) is set instead.
Setting Idle
Speed
1. Ensure parking
brakes are applied.
2. Ensure transmission
is in Neutral.
3. Engage PTO
per the
manufacturer's operating
instructions.
4. Move the
ON/OFF switch to the
"ON" position.
5. Toggle
the SET/RESUME switch
to obtain the desired engine rpm.
Cancelling Cruise
Control
You
can cancel cruise control in any
of these ways:
• Tap the brake pedal.
• Tap the clutch pedal.
• Move the ON/OFF switch to the
"OFF" position.
Engine Fan Control
The engine fan can be turned ON
using a switch that is mounted on the
accessory switch panel. This lets you
set the fan to manual or automatic
operation.
• With the ignition key turned ON
and the fan switch in the MANUAL
position, the engine fan will be ON
regardless of engine temperature.
• With the engine fan switch in the
AUTO position, the engine fan will
automatically turn ON when the
engine computer sends a signal
requiring the engine fan to be on.
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(04/13) Y53-6047–2C 4-11