... techynology 1.Product Introduction State-of-the art machiningEach roller shaft is engineered drop-forged and machined by ... frequency heat treating equipment guarantees maximum strength.Maximum lifeEach roller shell is carefully heat treated to ensure long ... low wear bimetal bushings. Replacement parts of track roller for Caterpillar,Komatsu,Hitachi,Kobelco,Mitsubishi,Sumitomo,Daewoo,Hyundai,Samsung ...