24. SERVICE PROCEDURE 4. Bleeding air from swing motor 1. Run the engine at low idling, loosen air bleeding plug a , and check that oil oozes out from air bleeding plug a . NOTICE When doing this, do not operate the swing. 2. If oil does not ooze out, stop the engine, remove air bleeding plug a , fill the motor case with hydraulic oil. 3. After completion of the air bleed operation, tighten air bleeding plug a . 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 a , and if oil flows out, tighten the air bleed plug. 2. Keep the engine running at low idling, and swing the work equip- ment 90 o 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. PC450-ENG 3-77