Komatsu PC138USLC Operation & Maintenance Manual page 191

MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS
3. Turn fuel control dial (2) to the center position between LOW
IDLE and HIGH IDLE.
4. Hold the key in starting switch (3) at HEAT position (D) and
check that preheating monitor (4) lights up.
After approx. 30 seconds, preheating monitor (4) will flash for
10 seconds to inform the operator that the preheating has been
completed.
5. When engine pre-heating monitor (4) goes off, turn the key in
stating switch (3) to the START position (C) to start the engine.
6. When the engine starts, release the key in starting switch (3).
The key will automatically return to ON position (B).
7. 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.
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OPERATION OPERATION