Komatsu PC138USLC Operation & Maintenance Manual page 189

MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS
3. Turn the key in starting switch (3) to START position (C). The
engine will start.
4. When the engine starts, release the key in starting switch (3).
The key will automatically return to ON position (B).
5. Keep the engine idle for the initial 15 seconds right after it has been started, and do not operate any control lever
or the fuel adjustment dial during that time.
6. Check that battery charge monitor (4), engine oil pressure
monitor (5), and engine oil level monitor (6) are off.
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OPERATION OPERATION