Knowledge of bearing in the hot - bearing during operation

Bearing hot when running the following questions, for your reference: 1, the pre-tightening force is too large, smaller clearance; 2, lubricating oil or grease selection is not reasonable, lubrication system configuration is reasonable, heat dissipation is not good; 3, what is the temperature reached, whether within the scope of the permit; 4, bearing choice is correct, whether beyond bearing design performance; 5, the bearing precision meets the requirements; If there is damage; 6, using the environment influence on bearing, such as dust particles can enter the bearing; 7, when installation if bearing pre-tightening force of uniform.