Komatsu PC290LC-6K Operation & Maintenance Manual page 221

4. Bleeding air from swing motor
1. Run the engine idle at a low speed for about five minutes, then
loosen drain port plug
NOTICE
When doing this, do not operate the swing.
2. If oil does not flow out, stop the engine and fill the motor case with
hydraulic oil through drain port plug
3. After completion of the air bleed operation, tighten drain port plug
.
4. Run the engine at low idling, and swing 2 or more times slowly
and uniformly to the left and right.
NOTICE
If the air is not bled from the swing motor, the bearings of the
motor may be damaged.
5. Bleeding air from travel motor
(only after draining oil from travel motor case)
1. Run the engine at low idling, loosen air bleeding plug
flows out, tighten the air bleed plug.
2. Keep the engine running at low idling, and swing the work equip-
ment 90° 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
aqually both forward and in reverse.
and confirm that oil flows out.
.
24. SERVICE PROCEDURE
, and if oil
3-75