1.Mini Excavator lower roller PC20-3 2.Material:50Mn 3.Hardness: ... -55 4.Warranty:6 months 5.Process:forging 1.Product:Mini Excavator lower roller PC20-3 2.Warrenty:6 months3.Track ... on excavator and bulldozer parts.5.Brand:Komatsu,Hitachi,Caterpillar,Kobelco,Summitomo,Hyundai,Daewoo,Volvo,Samsung,Sunward,Kato,Mitsubishi,Ihisce and ...