I don't know if you will find that when you operate a bearing, if you don't operate it for a long time, the bearing will always heat up. Why is that?

Roller bearing reasons:

1. The lack of oil in the bearing.

2. Poor grease, mixed with sand, water and other impurities.

3. Too much fat makes the friction of the grease increase, making it difficult to turn the roller.

4. The roller is damaged or damaged.

5. The inner ring is damaged.

6. The cage wears.

7. Rolling bearing corrosion.