MAST G 0341067 - Caterpillar

Keep engine speed low until the engine oil pressure registers on the gauge. If the oil pressure does not register, stop the engine and investigate the cause before starting again. Failure to do so, can cause engine damage.
During machine warm-up in cold ambient temperatures, engine speed may elevate to help warm transmission oil. The engine may automatically change speeds when the machine is stationary and idling in cold ambient temperature for an extended time. This is to:
Maintain desired coolant temperature.
Maintain desired operation of engine systems.
Maintain desired operation of the regeneration system.During extended idling in cold ambient conditions, engine speed may operate between 1000 rpm and 1600 rpm. Operation at 1600 rpm is minimal and will only last for up to 20 minutes. The high exhaust system temperature indicator may also illuminate during extended idling conditions to signal that a low speed regeneration is in progress. A regeneration done in cold ambient extended idling conditions will typically last for 5-10 minutes.
When the engine is cold, operate the engine at low idle for at least 5 minutes. Cycle all controls in order to allow warm oil to circulate through all hydraulic cylinders and through all hydraulic lines.Idle the engine. If the hydraulic functions are sluggish, additional time may be required for warm-up.
Release the brake. Move the equipment forward and backward for several meters (yards). Exercise the machine for several minutes. In order to reduce the total warm-up time, start exercising the entire machine before you complete the hydraulic warm-up time.
Operate under a light load until the systems reach normal operating temperatures.
During machine operation, frequently look at the alert indicators and the gauges.