first you got to get the old ones out,by means of going behind the old bearing and knocking it out ,once you get it out take some emery paper or sand paper and clean the area were the old bearing was ,then install the new one but make sure it goes in straight use a larger socket or a pice of wood ,once in assemble it the same way you took it apart but in reverse .i hope this could help i tried to get the manual download for you but i lost it