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Front idlers wheels for Zoomlion Below 500T crawler crane are suitable for Zoomlion Below 500T crawler crane. As usually, the wheel surface of ZOOMLION 500T crane idlers/ZOOMLION crawler crane front idlers/ZOOMLION crawler crane front wheels are made of smooth surface, with the arm ring as the guiding function in the center, and the ring surface on both sides supports the rail chain.