Komatsu WA320-5H, Operation & Maintenance Manual, Page: 262 / 321

ATTACHMENTS, OPTIONS
MACHINE MONITOR WITH LOAD METER
6-15
BRAKE OIL PRESSURE CAUTION LAMP
This lamp (1) lights up when the brake oil pressure goes below
the specified value.
During checks before starting (starting switch at the ON posi-
tion, engine stopped) the lamps are lighted up, and when the
engine is started, the lamps go out.
During operation (engine running)
If the brake oil pressure goes down during operation, the brake oil pressure 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 “E03“ and the bottom line displays “CHECK RIGHT
NOW“ and “CALL“ alternately for 3 seconds each, so stop the machine immediately in a safe place, stop the
engine, and carry out inspection.
If the brake oil pressure caution lamp lights up, the footbrake may not work, so keep the parking brake applied to
prevent the machine from moving.
Keep the parking brake applied to prevent the machine from moving until the brake pressure becomes normal and
the brake oil pressure caution lamp goes out.
ENGINE OIL PRESSURE CAUTION LAMP
This lamp (2) lights up to warn the operator that the engine
lubricating oil pressure has dropped.
During checks before starting (starting switch at the ON posi-
tion, engine stopped) the lamps are lighted up, and when the
engine is started, the lamps go out.
During operation (engine running)
If the engine lubricating oil pressure goes down during operation, the engine lubricating oil pressure 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 “E03“ and the bottom line displays “CHECK RIGHT
NOW“ and “CALL“ alternately for 3 seconds each, so stop the machine immediately in a safe place, stop the
engine, and carry out inspection.