Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

STARTING AND OPERATING THE VEHICLE
Cruise Control (Option)
This feature improves fuel mileage and reduces driver
fatigue by maintaining a constant vehicle speed. The
cruise control will only operate above a programmed minimum
vehicle speed, 15 mph for the CAT 3126B engine,
30 mph for the Cummins ISC engine.
Engaging the Cruise Control
2. Accelerate the vehicle to the desired cruise speed.
3. Toggle the SET/RESUME switch lever to the SET
position to set the cruise speed. This toggle switch
has additional functions that are set by the manufacturer.
The two functions are:
• To decrease the cruise set speed, hold the SET/
RESUME switch in the RESUME position and coast
to a lower speed.
• To increase the cruise set speed, hold the SET/
RESUME switch in the SET position; this will accelerate
the vehicle to a higher speed.
Disengaging the Cruise Control
Do one of these steps to disengage the cruise control:
NOTE: Ensure that the vehicle speed is above
the minimum cruise control speed and the
engine speed is above 1100 rpm.
1. Move the ON/OFF switch to the ON position.
NOTE: Toggling the SET/RESUME switch to the
RESUME position at this point will select the previously
set cruise speed.
• Move the ON/OFF switch to the OFF position.
or
• Depress the brake pedal.
or
• Depress the clutch pedal.
Medium Duty (R05/09) Y53-6027 – 97 –