How to solve the leakage of Roots blower

There may be the following reasons for the leakage of the Roots blower

1, The oil tank level is too high, and the oil leaks out from the drain. The tank level should be lowered at this time.

2, Seal wear causes oil leakage at the shaft end, at this time may need to replace the seal

3, The vent of the wall panel and the oil tank is blocked, causing the oil to leak into the housing. At this time to dredge the vent, the middle cavity is installed with a 2mm aperture cock, open the cock under the wall panel.