Komatsu PC1250-11, Original Instructions Manual

Page: 226 / 452

1.
Check that the engine coolant temperature caution lamp
(1) displays the correct temperature.
If it displays the low temperature, perform additional warm-
up operation according to step 2 until it displays the 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.
2.
Turn the fuel control dial (2) to the middle between Low
idle (MIN) and High idle (MAX) to run the engine at a medi-
um speed.
Run the engine with no load until the engine coolant tempera-
ture caution lamp (1) displays the correct temperature.
• Display (A): when temperature is correct: Caution lamp
background (C) is blue.
• Display (B): when temperature is low: Caution lamp back-
ground (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.
MACHINE OPERATIONS AND CONTROLS OPERATION
3-160