... .Process:forging 1.Product:Mini Excavator lower roller PC20-3 2.Warrenty:6 months3.Track ... on uneven group, track rollers carry a tremendous impact. Therefore, the support of track rollers is huge ... water from damaging it.4.Main Product: Track roller,Carrier roller,Sprocket,Segment,Idler,Track Link Assy,Track shoes, ... ear,Round ball,Yoke,Spring,Idler Yoke,Roller Guide,Bucket bushing,Bucket pin and so ...