Maintenance matters of deep groove ball bearing manufacturers. In order to better maintain the original performance of the deep groove ball bearing, we need to repair and maintain it to ensure the reliability of the deep groove ball bearing operation and improve the operation efficiency of the deep groove ball bearing. According to the load acting on the imported bearing, in the case of the rotation problem of the ferrule, the load borne by the ferrule can be divided into three types: turning load, fixed load and back-and-forth rocking load. The synthetic radial load vector acting on the bearing ring rotates along the circumferential direction of the raceway, which is borne by each part of the raceway in turn, and is accordingly transmitted to each part of the surface of the shaft housing hole. This kind of load is called the turning load, also known as the cyclic load. The common center of the turning load is the resultant radial load vector and the relative rotation of the ferrule. The ferrule that bears the turning load and the shaft or the housing hole should use an overspray or an interference fit. If the gap fitting device is used for the purpose of fitting, there will be a slippage phenomenon between them, which will cause contact surface friction and frictional heat, which will cause the temperature to rise rapidly, and the deep groove ball bearing will be quickly damaged.