Komatsu PC138US-11 Operation & Maintenance Manual page 94

EXPLANATION OF COMPONENTS OPERATION
ENGINE COOLANT TEMPERATURE CAUTION LAMP
Engine coolant temperature caution lamp warns about states
caused by engine coolant temperature.
When abnormal
The caution lamp lights up in red and action level "L02" is dis-
played.
The engine coolant temperature is abnormally high.
While this lamp is lit, the overheat prevention system is auto-
matically actuated and the engine speed drops.
Stop operations and run it at low idle until the caution lamp
changes to the normal display color (lights up in blue) at the
correct temperature.
When temperature is low
The caution lamp lights up in white.
The engine coolant temperature is low.
The engine needs to be warmed up.
Perform the warm-up operation for the engine until the caution lamp changes to the normal display color (lights
up in blue) at the correct temperature.
For detail, see "METHOD FOR ENGINE WARM-UP OPERATION (3-159)".
When temperature is correct
The caution lamp lights up in blue.
HYDRAULIC OIL TEMPERATURE CAUTION LAMP
The hydraulic oil temperature caution lamp warns about states
of hydraulic oil temperature.
When abnormal
The caution lamp lights up in red and action level "L02" is dis-
played.
The hydraulic oil temperature is abnormally high.
Stop operations and stop the engine or run it at low idle until
the caution lamp changes to the normal display color (lights up
in blue) at the correct temperature.
When temperature is low
The caution lamp lights up in white.
The hydraulic oil temperature is low.
It is necessary to warm up the hydraulic component.
Perform the warm-up operation for the hydraulic component until the caution lamp changes to the normal dis-
play color (lights up in blue) at the correct temperature.
For detail, see "METHOD FOR HYDRAULIC SYSTEM WARM-UP OPERATION (3-161)".
When temperature is correct
The caution lamp lights up in blue.
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