1. the spindle and motor center is not concentric, adjust to make it concentric with the spindle;
2. too much grease, too little grease or bad, change the grease, according to the specified refueling;
3. bearing damage, replace the new bearing;
4. spindle bending or rotor imbalance, straighten the spindle, balance the rotor;
5. long-term overload work, reduce the amount of feeding;
6. Selected grease type is not right, re-select lithium molybdenum disulfide.
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