The process flow of track roller shell, carrier roller shell and shaft as below:
The track roller is composed of shell, collar, shaft, seal, O-ring, bushing bronze, plug, lock pin, the function of the track roller is to convey the weight of excavator to the ground. When excavator is run on uneven ground, track rollers carry a tremendous impact. Therefore, the support of track rollers is huge. Moreover, if it is of poor quality and is often dusty, it needs a very good sealing to prevent dirt, sand, and water from damaging it. With high quality hardness ware-resisting alloy chrom&molybdenum floating seal and elastic rubber O ring, deep hardnedd wear surface, good quality bronze bushings, steel shaft made by round steel or forging, well lubricated oil recycle system, our products are according to the standard of OEM to manufacture. 
CAT, KOMATSU and SHANTUI company all have different size dozers KOMATSU small dozers have D37EX-34, D37PX-24, D39EXi-24, D39PXi-24, D39EX-24, D51EXi-24, D51PXi-24, D51EX-24, D51PX-24, mid-size dozers have D61EXi-24, D61PXi-24, D61EX-24, D61PX-24, D65EXi-18, D65PXi-18, D65EX-18, D65PX-18, D65WX-18, D65EX-18 WH, D65PX-18 WH, D65WX-18 WH, D71EXi-24, D71PXi-24, D71EX-24, D71PX-24, large dozers have D85EXi-18, D85PXi-18, D85EX-18, D85PX-18, D85EX-18 WH, D85PX-18 WH, D155AXi-8, D155AX-8, D155AX-8 WH, D155PX-8 LGP, D155CX-8 K170, surface mining dozers have D375A-8, D475A-8, CAT small dozers have D1, D2, D3, medium dozers have D4, D5, D6, D6XE, D7, D8, large dozers have D9, D10, D10T2, D11/D11CD, our factory can supply track roller, carrier roller, sprocket, idler, segemt, track shoe, track chain, track chain with shoe etc those undercarriage parts for those dozers parts.