Komatsu PC350LC-8, Operation & Maintenance Manual

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DETAILED CONTROLS AND GAUGES
OPERATION
3-22
Gauges and Meter 3
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 opera-
tions, the overheat prevention system is actuated.
q
(A) - (B): Red range
q
(A) - (C): Green range
q
(C) - (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 idling, engine coolant temperature monitor (E) shows abnor-
mality display, alarm buzzer sounds at same time
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 (3-143)“.
Display (G) at low temperatures: Monitor background (K) is
white
Display (H) at correct temperatures: Monitor background (K) is
blue
Display (J) when condition is abnormal: Monitor background
(K) is red