... .High hardness: HRC55~59 5.Material:50Mn Excavator track roller 1. Surface hardness: HRC 52-582. ... gear, hydraulic pump,stator, track roller, bottom roller, carrier roller, idler,driving wheel, track shoe, track link, teeth sprocket, ... teeth sharp, bite end, blade, guide plate,carrier planetary, piston, pin, bushing, shaft and other products. Track roller for ...