... :6 months 5.Process:forging 1.Product:Mini Excavator lower roller PC20-3 2.Warrenty:6 months3.Track ... function of the track roller is to convey the weight of an excavator to the groud.When ... water from damaging it.4.Main Product: Track roller,Carrier roller,Sprocket,Segment,Idler,Track Link Assy,Track shoes ... ,Spring,Idler Yoke,Roller Guide,Bucket bushing,Bucket pin and so on excavator and bulldozer parts. ...