In order to make angular contact ball bearings have better performance, they are generally installed in pairs. If you find that the installation is not smooth, first check the bearing installation direction, check the bearing cleanliness, check the matching accuracy, whether the preload is appropriate, and check the lubrication problem. Insufficient lubrication and unsuitable lubricants will cause the bearing to run poorly. Paired angular contact ball bearings can be installed back-to-back, face-to-face, or in series. Different forms have different performances. Be sure to follow the operating specifications and safety regulations to install them to avoid these problems.