Komatsu D155A-6 Operation & Maintenance Manual page 69

EXPLANATION OF COMPONENTS
MULTI-GAUGE
This gauge (6) displays a variety of items, but the following explanation describes the actuation for the power train
oil temperature gauge and hydraulic oil temperature gauge.
The indicator should be in the green range during operations.
If the indicator enters the red range (A) during operation, it means that the oil temperature is too high. If this happens,
turn the fuel control dial down to approx. 3/4 of the maximum speed, reduce the load, and wait for the oil temperature
to go down to the green range.
If the indicator enters the red range (A) during operations and the alarm buzzer sounds, run the engine at low idling
and wait for the oil temperature to go down.
(A) - (B): Red range
(A) - (C): Green range
(C) - (D): White range
POWER TRAIN OIL TEMPERATURE GAUGE
NOTICE
If the power train oil temperature gauge tends to enter red range (A), shift
down one speed range to reduce the load on the power train during
operations.
HYDRAULIC OIL TEMPERATURE GAUGE
NOTICE
When the indicator comes close to the red range during operation, the
hydraulic oil temperature has exceeded 102° C. Then run the engine at low
idling or stop it and wait for the oil temperature to go down.
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OPERATION