Komatsu H75051, Operation & Maintenance Manual

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ENGINE COOLANT TEMPERATURE GAUGE
Engine coolant temperature gauge shows the engine coolant
temperature.
When the indicator is in the white or green range during opera-
tion, it is normal.
If the indicator is in the red range, the engine coolant tempera-
ture caution lamp lights up in red, and action level “L02” is dis-
played.
At the same time, the centralized warning lamp lights up and
alarm buzzer sounds intermittently.
The engine output is then limited automatically.
Place the machine in a safe place, set the directional lever and directional selector switch to NEUTRAL position
(N), and run the engine at a medium speed with no load until the engine coolant temperature caution lamp goes
out.
HST OIL TEMPERATURE GAUGE
The HST oil temperature gauge shows the HST oil tempera-
ture.
When the indicator is in the green range during operation, it is
normal.
If the indicator is in the red range, the HST oil temperature cau-
tion lamp lights up in red, and action level “L02” is displayed.
At the same time, the centralized warning lamp lights up and
alarm buzzer sounds intermittently.
Stop the machine in a safe place, set the directional lever and
directional selector switch to NEUTRAL position (N), and run
the engine at a medium speed with no load until the HST oil temperature caution lamp goes out.
If the HST oil temperature becomes less than 10 °C, the caution lamp is lit in white, and the travel speed accel-
eration is limited. Perform the warm-up operation to raise the HST oil temperature by referring to “METHOD
FOR RUNNING-IN THE NEW MACHINE (3-179)”.
REMARK
The setting to increase the engine low idle speed under the low ambient temperature is available. For details,
see “2-STAGE LOW IDLE SWITCH (3-100)”.
FUEL GAUGE
Fuel gauge shows the amount of fuel in the fuel tank.
If the indicator is in the red range, the fuel level caution lamp
lights up in red. The fuel level is below 27 ℓ. Check the fuel lev-
el, and add fuel.
REMARK
When the machine is traveling uphill, traveling downhill, per-
forming scraping-up work, the correct fuel level may not be dis-
played. However, this is not abnormal.
EXPLANATION OF COMPONENTS OPERATION
3-40