Possible cause ：1）Overload; 2）Insufficient or excessive lubricating oil
Processing method：1）Check the actual load，Adjust to the specified value or replace the larger power reducer.； 2）Use oil for oil
Possible cause ： 1）Rotating / grinding noise, bearing damage; 2）Knock noise, irregular meshing
Processing method：1）Oil inspection; 2）Contact with user services
Possible cause ：Oil pollution or shortage of oil
Processing method：Oil change or refueling to the specified value
Possible cause ：1）Too much oil; 2）Incorrect installation of ventilators
Processing method：1）Modified oil level; 2）Correct installation of aerator
Possible cause ：Seal damage
Processing method：Contact with user services
Possible cause ：Seal damage
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