... Mini Excavator lower roller PC20-3 2.Material:50Mn 3.Hardness:HRC52-55 4.Warranty:6 months 5.Process:forging 1.Product:Mini ... Excavator lower roller PC20-3 2.Warrenty:6 months3 ... from damaging it.4.Main Product: Track roller,Carrier roller,Sprocket,Segment,Idler,Track Link Assy,Track ... ear,Round ball,Yoke,Spring,Idler Yoke,Roller Guide,Bucket bushing,Bucket pin and ...