Excavator bearing inner ring and shaft is a tight fit, excavator bearing outer ring and shell for a looser fit, available press will excavator bearing first pressure on the bearing, then the shaft together with the excavator bearing into the shell, pressure on the excavator bearing end face pad a soft metal material assembly casing. Excavator bearing inner ring and shaft, outer ring and shell hole are tight fit, assembly casing end face should be made to simultaneously press the excavator bearing inner and outer ring end face of the ring.