Komatsu PC138US-11 Operation & Maintenance Manual page 230

Hydraulic excavator
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MACHINE OPERATIONS AND CONTROLS
2.
Turn fuel control dial (2) to the middle between Low idle
(MIN) and High idle (MAX) to run the engine at a medium
speed.
Run the engine with no load until engine coolant temperature caution lamp (1) displays correct temperature.
Display (A) when temperature is correct: Caution lamp background (C) is blue.
Display (B) when temperature is low: Caution lamp background (C) is white.
If the engine coolant temperature caution lamp displays the correct temperature, the engine warm-up operation
is completed.
Then, perform the warm-up operation for the hydraulic components.
METHOD FOR CANCELING AUTOMATIC WARM-UP OPERATION
When you are forced to urgently cancel the automatic warm-up
operation or to lower the engine speed to low idle, do as fol-
lows.
1.
Turn fuel control dial (2) to High idle (MAX) position and
hold it for 3 seconds or more.
3-160
WENAM00111
OPERATION

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