When installing a non-standard bearing, you need check the verticality of the shaft ring and the centerline of the shaft. The method is to fix the dial indicator at the end of the box, and while the pointer of the dial indicator is observed, the bearing at the top of the bearing ring raceway is brought into contact with the dial gauge. If the pointer is skewed, the collar is not perpendicular to the centerline of the axis. When the hole in the housing is deep, it can also be checked with an extended micrometer head. After the bearing is installed correctly, the seat ring can automatically adapt to the rolling of the rolling elements, ensuring that the rolling elements are in the upper and lower raceways. If the reverse is installed, not only the bearing is not working properly, but also the mating surface is seriously worn. Since the difference between the collar and the seat ring is not obvious, the assembly should be very careful not to make mistakes. In addition, a gap of 0.2-0.5mm should be left between the bearing ring and the bearing housing hole to compensate for the error caused by inaccurate machining and installation of parts. When the center of the bearing ring is offset during operation, the gap can be automatically adjusted to avoid contact friction and make it work normally.