Engines off, then turn it back to on before using the second preset value. NOTE: The resume engine speed memory is not maintained if the ignition is shut off or, on Cum- mins engines, if the CRUISE ON switch is turned to off. 2. To disengage the PTO: 2.1 Depress the brake pedal or clutch pedal, or, (only on Cummins CELECT Plus engines the throttle pedal), or Detroit Diesel Some Detroit Diesel engine vehicles have separate controls for the PTO. If equipped with a preset nonad- justable PTO engine speed, there is only an on/off switch labeled FAST IDLE. If the vehicle is equipped with a variable PTO engine speed, there are two con- trols: an on/off switch, and a potentiometer knob.
Both of these are labeled GOVERNOR. 2.2 Move the CRUISE ON switch on the instru- ment control panel to off or press the PAUSE button on the shift knob. 3. To resume a previously selected engine speed: 3.1 If the CRUISE ON switch on the instrument control panel is in the off position, move it to on. To operate the PTO with separate PTO controls: 3.2 Momentarily move the SET/RESUME switch on the instrument control panel to RESUME or press the RESUME button on the trans- mission shift knob. 1. Apply the parking brakes. 2. Turn on the switch labeled GOVERNOR (or FAST IDLE for vehicles with a preset PTO system). 3.
For vehicles with a variable PTO, use the potenti- ometer knob to adjust the engine rpm. To adjust engine speed up or down, hold the SET/RESUME switch on the instrument con- trol panel at RESUME to accelerate or at SET to decelerate until the desired speed is reached, or press the RESUME button on the transmission shift knob to accelerate or the SET button to decelerate until the de- sired speed is reached. Cold Weather Operation General Information Satisfactory performance of a diesel engine operating in low ambient temperatures requires modification of the engine, surrounding equipment, operating practices, 4.19