Methods of elimination:
1, concentricity should be adjusted to less than 0.1MM.
2, modify the coupling.
3, repair or replace the oil pump.
4. Increase oil content in oil filter and joint location 400mm or
more.
5, replace the rotary shaft seal ring.
6. Clean the oil screen and filtrate the oil.
7. Clean the oil screen and filtrate the oil.
8. Lock the oil return line and extend the return pipe to the oil
surface.