2. To disengage the PTO:
2.1 Depress the foot brake pedal, trailer brake,
clutch pedal,
or
2.2 Flip the ON/OFF switch to OFF.
To resume a previously selected engine speed, momen-
tarily move the SET/RESUME switch to RESUME.
Adjust engine speed up or down by holding the SET/
RESUME switch at SET (accelerate) or at RESUME
(decelerate) until the desired speed is reached.
NOTE: The resume engine speed memory is not
maintained if the cruise control ON/OFF switch is
turned OFF, or if the ignition is shut off.
Engine Shutdown
Cummins Engines
1. With the vehicle stopped, apply the parking brakes,
and place the transmission in neutral.
2. It is important to idle an engine 3 to 4 minutes be-
fore shutting it down. This allows the lubricating oil
and the water to carry heat away from the combus-
tion chambers, bearings, shafts, etc. This is espe-
cially important with turbocharged engines.
Bearings and seals in the turbocharger are sub-
jected to the high heat of combustion exhaust
gases. While the engine is running, this heat is car-
ried away by oil circulation, but if the engine is
stopped suddenly, the turbocharger temperature
may rise as much as 115°F (46°C).
The extreme heat may cause bearings to seize or
oil seals to leak.
3. Do not idle the engine for excessively long periods.
Long periods of idling are not good for an engine
because the combustion chamber temperatures
drop so low the fuel may not burn completely. This
will cause carbon to clog the injector spray holes
and piston rings, and may result in stuck valves.
If the engine coolant temperature becomes too low,
raw fuel will wash the lubricating oil off the cylinder
walls and dilute the crankcase oil, causing all mov-
ing parts of the engine to suffer from poor lubrica-
tion.
CAUTION
Stop the engine at the first sign of malfunction. Al-
most all malfunctions give some warning to the op-
erator before significant damage occurs. Many en-
gines are saved because alert operators heed the
warning signs (sudden drop in oil pressure, un-
usual noises, etc.) and immediately shut down the
engine.
Engines
4.8
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