Komatsu ecot3 Operation And Maintenance Manual page 79

DETAILED CONTROLS AND GAUGES
Gauges and Meter
Engine Coolant Temperature Gauge
This meter (10) shows the engine coolant temperature.
During normal operations, the indicator should be in the green
range. If the indicator goes beyond red range (A) during
operations, the overheat prevention system is actuated.
(A) to (B): Red range
(A) to (C): Green range
(C) to (D): White range
The overheat prevention system is actuated as follows.
Red range (A) position: Engine coolant temperature monitor (E) shows abnormality display
Red range (B) position: Engine speed changes to low idle, engine coolant temperature monitor (E) shows
The overheat prevention system continues to work until the indicator enters the green range.
When the engine is started, if the indicator is at position (C), engine coolant temperature monitor (E) shows the
low-temperature display.
If this happens, carry out the warm-up operation. For details, see "Engine Warm Up (PAGE 3-137)".
Display (G) at low temperatures: Monitor background (K) is white
Display (H) at correct temperatures: Monitor background (K) is
Display (J) when condition is abnormal: Monitor background (K)
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abnormality display, alarm buzzer sounds at same time
blue
is red
OPERATION