Ford 2002 F650 Owner's Manual page 79

To set a speed
7.3L Power Stroke engine
• Press SET ACCEL. For speed
control to operate, the speed
control must be ON and the
vehicle speed must be greater
than 48 km/h (30 mph).
Do not use the speed control in heavy traffic or on roads that
are winding, slippery, or unpaved.
Caterpillar/Cummins engines
Press SET +. If the vehicles is
moving, this will set the vehicle
speed. If the vehicle is stationary,
this will set the vehicle idle RPM.
If you drive up or down a steep hill, your vehicle speed may vary
momentarily slower or faster than the set speed. This is normal.
Speed control cannot reduce the vehicle speed if it increases above the
set speed on a downhill. If your vehicle speed is faster than the set
speed while driving on a downhill, you may want to shift to the next
lower gear or apply the brakes to reduce your vehicle speed.
If the vehicle speed falls below 48 km/h (30 mph) or engine RPM falls
below 1 000 RPM, your speed control will disengage. This is normal.
Pressing RESUME - will re-engage it.
Driver Controls
79