Komatsu PC308USLC-3E0 Operation & Maintenance Manual page 148

MACHINE OPERATIONS AND CONTROLS
NOTICE
Canceling automatic warm-up operation
If it becomes necessary in an emergency to cancel the automatic warm-up operation or to lower the engine speed to low idle, do
as follows.
1] Turn fuel control dial (2) to the full speed (MAX)
position and hold it for 3 seconds.
2] When fuel control dial (2) is returned to the low idle
(MIN) position, the engine speed will drop.
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OPERATION