cause of issue:

　　1. Bearing wear or damage will also make the bearing heat

　　2. The lack of oil and too much oil in the bearing will cause the bearing to heat up

　　3. There are sundries in the bearing, such as dust particles, etc.

　　Solution: Check the wear of the bearings and replace them in time; check the oil level and add lubricating oil on time; clean up foreign matter that has entered the bearing parts in time.