LINK AS-TRACK 2943060 - Caterpillar

Warm-up
Operate the engine at low idle for two to three minutes. Allow the jacket water coolant temperature to begin to rise before increasing the engine rpm to rated rpm. Note: More warm-up time may be necessary when the ambient temperature is below −18 °C (0 °F).
Check all of the indicators during the warm-up period.
Make another walk-around inspection. Inspect the engine for fluid leaks and air leaks. The time that is needed for the engine to reach the normal mode of operation is usually less than the time that is needed for a walk-around inspection.The engine will reach normal operating temperature faster when the engine is operated at rated rpm and low power demand. This procedure is more effective than idling the engine with no load. The engine should reach normal operating temperature in a few minutes.Engaging the Generator
Ensure that the indicators are in the normal ranges for the engine rpm.
Increase the engine rpm to rated rpm. Always increase the engine speed to rated rpm before applying the load.
Adjust the voltage and the frequency, if necessary.
Close the main circuit breaker in order to apply the load.
Continue to check the indicators and the generator.