Bearings should be cleaned before installation. When installing, you should use special tools to press the auxiliary bearing straight evenly, do not use hand hammer percussion, in particular, directly on the bearing percussion. When the bearing race and seat hole with loose, you should repair the seat hole or replace the bearing, do not use the bearing mating surface pitting or pad copper skin barely used. Bearings should be removed when using a suitable pull the bearings out, do not use chisels, hand hammer and other percussion bearings.