Now let’s analyze what is the cause of NTN bearing failure. There has been rolling mill bearing failure in recent years. Engineers are also looking for the cause, but they have not found it. And properly block sundries and moisture, indicating that the oil seal should not be worn However, when opening the bearing housing, check the bearing and regularly check the oil seal Check the condition of the oil seals near the high temperature bearing to ensure that they are sufficient to prevent hot or corrosive liquid or gas from penetrating the bearing along the axis.