(1) Before the bearing is installed, use appropriate measuring tools to check the processing quality (such as dimensional accuracy, shape accuracy and surface roughness, etc.) of the shaft, seat hole and related parts according to the technical requirements on the design drawings. (2) If there are bumps, burrs, rust spots or solid particles (such as abrasive chips, sand, mud) on the assembly surface of the shaft and the seat hole, it will not only make the bearing installation difficult and make the installation position incorrect, but also solid particles If it falls into the bearing, it will have a grinding effect. When the bearing rotates, it will scratch or scratch the working surface of the bearing. Therefore, it must be carefully inspected before installation. If the above defects are found, they should be corrected. For example, use an oil file to remove burrs, raised bumps, and rust spots, and polish with a fine emery cloth. Another example is to clean solid particles and dirt. (3) The assembly surface should be cleaned with clean gasoline, kerosene, toluene or xylene and other solutions, and dried with a clean cloth, and then coated with a thin layer of lubricating oil, which will make the installation and operation more convenient. (4) Open the bearing package just before installation, immerse it in the above gasoline and other liquids and rotate it gently by hand, ensuring that the cage, rolling elements and the encapsulated oil on the surface of the raceway are thoroughly cleaned. (5) When cleaning a large number of bearings, first use hot engine oil at a temperature of 90～100℃ to melt the sealing oil. At the same time, use a tool that does not have sharp edges and does not drop off all the old oil, and then blanch for a few minutes, then Rinse the oil with kerosene, and finally clean it again with gasoline. After cleaning, wear film gloves and put the bearing on a clean cloth or paper on the workbench to dry. (6) Note that the sealed bearing cannot be cleaned by this method, and the inside of the seal should be kept intact and cannot be cleaned.