Komatsu D475A-5E0 Operation & Maintenance Manual page 297

SERVICE PROCEDURE SERVICE PROCEDURE
3. Open air bleeding valve (2).
4. Operate switch (3) of the electric priming pump to ON position.
Lamp (4) will flash and the electric priming pump will start.
5. When the specified time (approximately 7 minutes) has
passed, lamp (4) automatically goes out and the electric
priming pump stops.
REMARK
The electric priming pump switch has a built-in timer, and this actuates and stops the pump automatically.
While the lamp is flashing, the electric priming pump will stop, but this does not indicate any abnormality.
If the switch is turned to OFF position when the lamp is lit, the lamp will go out and the electric priming pump will
stop.
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MAINTENANCE MAINTENANCE