Komatsu ecot3 Operation And Maintenance Manual page 310

MAINTENANCE
NOTICE
If the air is not bled from the swing motor, the motor bearings may be damaged.
When replacing the travel motor safety valve, please contact your Komatsu distributor to have it replaced and to have the air
bled.
5. Bleeding air from travel motor
(Bleed the air only when the oil inside the travel motor case has been drained.)
1) Run the engine at low idle, loosen air bleeder (4), and
tighten it when oil flows out.
2) Run the engine at low idle and swing the work equipment
90 degrees to bring it to the side of the track.
3) Jack up the machine until the track is raised slightly from
the ground. Rotate the track under no load for 2 minutes.
Repeat this procedure on both the left and right sides, and
rotate the track equally both forward and in reverse.
6. Bleeding air from attachment (when installed)
If a breaker or other attachment has been installed, run the engine at low idle and operate the attachment pedal
repeatedly (approximately. 10 times) until the air has been bled from the attachment circuit.
NOTICE
If the method of bleeding the air from the attachment itself is specified by the manufacturer, bleed the air according to the
specified procedure.
After completing the air bleeding operation, stop the engine, and leave the machine for 5 minutes before starting operations.
This will remove the air bubbles in the oil inside the hydraulic cylinders.
Check that there is no leakage of oil and wipe off any oil that has been spilled.
After completing the air bleeding operation, inspect the oil level, and if the oil level is low, add oil.
MAINTENANCE PROCEDURE
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