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Idler mainly by the Idler shaft, Idler plugging board, guide wheel round body and some standard (iron set, cylindrical pin, double metal collar, bolts spring, gaskets, oil seal floating oil slick, o-type ring seal ring) combination and become, the main function is to lead the right track winding, at the same time, a tension device makes the guide wheel move in order to adjust the tension degrees of tracks, so guide wheel is tracked guide wheel, and something of a device is a tight round.