Komatsu D31EX-21, Operation & Maintenance Manual, Page: 64 / 256

EXPLANATION OF COMPONENTS
OPERATION
3-12
HST OIL TEMPERATURE GAUGE
NOTICE
If the HST oil temperature gauge frequently enters red range (C), check for clogging of the oil cooler.
This meter (2) displays the oil temperature in the pump suction
piping.
Green range (B) should be lighted up during normal opera-
tions.
If red range (C) lights up during operation, move the fuel con-
trol lever to lower engine speed to approx. 3/4 of the full speed,
reduce the load and run until the oil temperature enters green
range (B).
If red range (C) lights up during operation, and the HST oil tem-
perature caution lamp flashes and the alarm buzzer sounds,
stop the machine, run the engine at low idle, and wait for the oil
temperature to go down to green range (B).
(A): White range
(B): Green range
(C): Red range
FUEL LEVEL GAUGE
Gauge (3) fuel level in the fuel tank.
During normal operation, the green range (B) should be lighted
up.
If red range (A) lights up during operation, add fuel immedi-
ately. If this is not done, the engine speed will become irrgular
or an error display will be shown on the monitor.
(A): Red range
(B): Green range
REMARK
The display is not proportional to the amount of fuel remaining.
If only the red range (A) lights up, there is less than 20 liters of
fuel remaining.
ENGINE PREHEATING PILOT LAMP
hen this lamp (4) is lighted up, it indicates that the electric
heater is being used to preheat the engine.
This lamp lights up when the starting switch is at the HEAT
position.
When the starting switch is released, the lamp will go out.