Komatsu WA320-5H, Operation & Maintenance Manual, Page: 265 / 321

MACHINE MONITOR WITH LOAD METER
ATTACHMENTS, OPTIONS
6-18
3. Do not keep the brake pedal depressed continuously; use
the brake only intermittently.
If use of the brake is reduced for a short time in the way recommended above, the axle oil temperature will go
down and the caution lamp will go out.
PARKING BRAKE REMINDER CAUTION LAMP
This lamp (2) lights up when engine is stopped but the parking
brake is not applied.
At the same time, the central warning lamp lights up and the
alarm buzzer sounds intermittently.
When the parking brake is applied, the lamp goes out and the
buzzer stops.
HST OIL TEMPERATURE CAUTION LAMP
This lamp (3) lights up to warn the operator that the HST oil
temperature has risen.
During checks before starting (when the starting switch is
turned to the ON position but the engine is not started), this
monitor does not light up.
During operation (engine running)
When the HST oil temperature goes up, the HST oil temperature caution lamp and central warning lamp light up,
and the alarm buzzer sounds intermittently.
At the same time, the top line of the character display displays “E02“ and the bottom line displays “HST OIL
OVERHEAT“, so take the following action.
ENGINE COOLING WATER TEMPERATURE CAUTION LAMP
This lamp (4) lights up to warn the operator that the engine
cooling water temperature has risen.
During checks before starting (when the starting switch is
turned to the ON position but the engine is not started), this
monitor does not light up.
During operation (engine running)
If the engine cooling water temperature rises, the engine cooling water temperature caution lamp only will light up.
If the water temperature rises further, the central warning lamp will light up and the alarm buzzer will sound inter-
mittently.
At the same time as the central warning lamp lights up, the top line of the character display displays “E02“ and the
bottom line displays “BRAKE OVERHEAT“, so stop the machine and run the engine under no load at a mid-range
speed until the lamp goes out.