How to change oil in impeller aerator

1. First, ensure that the machine of the impeller aerator is in static and cold state, and the gear oil temperature does not exceed 50 degrees.

2. Secondly, unscrew the oil drain plug at the bottom of the gearbox, catch the waste oil with a bucket until the oil drain drips, and then flush the gearbox with new oil.

3. Finally, screw on the oil drain plug and add new oil to the specified liquid level.