Operation and maintenance manual
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OperatingtheEngine
Do not operate engine at full throttle below peak torque engine speed (1100 to 1600 RPM.dependent on
engine rating) for extended periods (more than 1 minute) of time.
Allow the engine to idle 3 to 5 minutes before shutting it off after a full load operation.
Monitor the oil pressure and coolant temperature gauges frequently.Refer to Lubricating Oil System or
Cooling System,Section v,for recommended operating pressures and temperatures.Shut off the
engine if any pressure or temperature does not meet the specifications.
Caution: Continuous operation with low coolant temperature (below 60℃ [140°F]) or high
coolant temperature (above 100 °C [212 °F]) can damage the engine.
If an overheating condition Starts to occur, reduce the power output of the engine by releasing the
throttle pressure or shifting the transmission to a lower gear,or both,until the temperature returns to
normal operating range.If engine temperature does not return to normal, shut off the engine.and
refer to Troubleshooting,Section T,or contact a Cummins Authorized Repair Location.
Most failures give an early warning.Look and listen for changes in performance,sound,or engine
appearance that can indicate service or engine repair is needed.Some changes to look for are as
follows:
— Engine misfires — Excessive smoke
— Vibration — Loss of power
— Unusual engine noises — An increase in oil consumption
— Fuel, oil, or coolant leaks — An increase in fule consumption
-— Sudden changes in engine
operating temperature or oil pressure
EngineOperatingRange
Caution: Cummins engines are designed to operate successfully at full throttle under transient conditions
down to peak torque engine speed (RPM). This is consistent with recommended driving practices for
good fuel economy. Excessive full throttle operation below pead torque RPM (peak torque RPM varies
from 1,100 RPM to 1,600 RPM, depending upon rated engine speed) will shorten engine life to overhaul,
can cause serious engine damage, andis considered engine abuse.
Caution: Operation of the engine below peak Torque RPM can occur during gear shifting due to different
of ratios between transmission Sears, but engine operation must not be sustained more than 1 minuteat
full throttle below peak torque RPM.
Caution: Operating the engine beyond high idle speed can cause severe engine damage. When