Komatsu WA380-6 Operation & Maintenance Manual page 179

OPERATION
4. Method of starting engine in temperatures of approx. -20°C (-4°F).
1) Keep the engine starting motor running for the max. 20 seconds, holding the key of engine starting switch
(1) in the START position (C), until the engine starts up.
2) If the engine fails to start up even after running the engine starting motor for about 20 seconds, stop the
engine starting motor once (release the engine starting switch (1) key), and try the same process again after
a pause for a minute or so.
3) If the engine still fails to start up after the second attempt, try the same process for the third time after a pause
for a minute or so.
5. When the engine has started up and the engine speed rises,
release the key of engine starting switch (1). The key will
automatically return to the ON position (B).
AUTOMATIC WARMING-UP OPERATION
After starting the engine, if the engine water temperature is below 20 °C, the automatic warming-up operation
(engine speed: 1000 rpm) is carried out, and is cancelled when the engine water temperature goes above 30 °C.
(Engine speed: 850 rpm)
(X) :Engine speed (rpm)
(Y) :Water temperature (°C)
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OPERATION