... .High hardness: HRC55~59 5.Material:50Mn Excavator track roller 1. Surface hardness: HRC 52-582. Hardness ... the excavators’ reliable quality. Detailed Product Descriptionkomatsu bulldozer track roller, big stock, comeptitive price Our company is ... drive gear, hydraulic pump,stator, track roller, bottom roller, carrier roller, idler,driving wheel, track shoe, track link, teeth sprocket, teeth sharp, ...