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                  Towed sprocket tracked sprocket sprocket chassis four wheeled belt

                       The supporting wheel is used to support the weight of the tractor and roll on the track (rail chain) or track board. It is also used to limit the track and prevent lateral slippage. When the tractor steers, the supporting wheels force the track to slip on the ground.

                       Supporting wheels are often in mud, water and dust, and bear strong impact, so they are required to be sealed reliably and wear-resistant.

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