136 STARTING AND OPERATING
IDLE SHUTDOWN
This feature can be enabled so that the truck will
automatically shutdown when the truck has been idling for
a set period of time when the engine is at operating
temperature. Idle time can be set in 5 minute increments
between 5 and 60 minutes. See an authorized dealer to
enable this feature.
NOTE:
The idle shutdown timer is disabled while the Power Take
Off (PTO) is active.
PROGRAMMABLE MAXIMUM VEHICLE
S
PEED
This feature allows the owner to set a maximum vehicle
speed for the vehicle. The 2500 and 3500 Series
maximum vehicle speed can be set between 40 mph
(64 km/h) and 87 mph (140 km/h).
NOTE:
DO NOT set the maximum vehicle speed to a value greater
than what the vehicle tires are rated for.
OPERATING PRECAUTIONS
Avoid Overheating The Engine
The temperature of the engine coolant (antifreeze) (a
mixture of 50% ethylene-glycol and 50% water) must not
exceed the normal range of the temperature gauge 240°F
(116°C) with a 21 psi (145 kPa) coolant pressure cap.
Usually the engine coolant (antifreeze) temperature
indicated during operation will be to the left of center in
the normal range of the gauge.
Avoid Low Coolant Temperature Operation
Continual operation at low engine coolant (antifreeze)
temperature below the normal range on the gauge 140°F
(60°C) can be harmful to the engine. Low engine coolant
(antifreeze) temperature can cause incomplete
combustion which allows carbon and varnish to form on
piston rings and injector nozzles. Also, the unburned fuel
can enter the crankcase, diluting the lubricating oil and
causing rapid wear to the engine.
COOLING SYSTEM TIPS
To reduce potential for engine and transmission
overheating in high ambient temperature conditions, take
the following actions:
City Driving — When stopped, shift the transmission
into NEUTRAL and increase engine idle speed.
Highway Driving — Reduce your speed.
Up Steep Hills — Select a lower transmission gear.
Air Conditioning — Turn it off temporarily.
Do Not Operate The Engine With Low Oil
Pressure
When the engine is at normal operating temperature, the
minimum oil pressures required are:
Do Not Operate The Engine With Failed
Parts
All engine failures give some warning before the parts fail.
Be on the alert for changes in performance, sounds, and
visual evidence that the engine requires service. Some
important clues are:
Engine misfiring or vibrating severely.
Sudden loss of power.
Unusual engine noises.
Fuel, oil or coolant leaks.
Sudden change, outside the normal operating range, in
the engine operating temperature.
Excessive smoke.
Oil pressure drop.
Idle 700 to 800 RPM 10 psi (69 kPa)
Full speed and load 30 psi (207 kPa)
CAUTION!
If oil pressure falls to less than normal readings, shut
the engine off immediately. Failure to do so could result
in immediate and severe engine damage.
23_DJD2_OM_EN_USC_t.book Page 136
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