1: The shaft size of the slewing bearing is too large, so the bearing will be tight

2: The aluminum three-layer annular sealing ring has friction and causes heat

3: The slewing bearing is coated with too much grease or the oil level is too high

4: Lubricant failure caused by improper type of grease or lubricating oil

5: The oil level is low and the grease is insufficient

6: the friction between the inner ring and the sealing ring generates heat