12. OPERATION 8. Press working mode switch b on the monitor panel until the lamp of the mode to be used lights up. 12.3.2 IN COLD AREAS (AUTOMATIC WARMING-UP OPERATION) When starting the engine in cold areas, carry out the automatic warming-up operation after starting the engine. When the engine is started, if the engine water temperature is low (below 30 o C (86 o F)), the warming-up operation is carried out automati- cally. The automatic warming-up operation is cancelled if the engine water temperature reaches the specified temperature (30 o C (86 o F)) or if the warming-up operation is continued for 10 minutes.
If the engine water temperature or hydraulic oil temperature are low after the automatic warming-up operation, warm the engine up further as follows. NOTICE When the hydraulic oil is at a low temperature, do not carry out operations or move the levers suddenly. Always carry out the warming-up operation. This will help to extend the machine life. Do not suddenly accelerate the engine before the warming-up operation is completed. Do not run the engine at low idling or high idling continuously for more than 20 minutes. This will cause leakage of oil from the turbocharger oil supply piping.
If it is necessary to run the engine at idling, apply a load from time to time or run the engine at a mid-range speed. 1. Set fuel control dial a at the low idling (MIN) position and run the engine for about 5 minutes without load. PC450-ENG 2-53