Maintaining-free guiding wheel for crawler crane

A maintaining-free guiding wheel for a crawler crane is composed of an outer support, a shaft bush, a wheel body, an inner support, pins, a center shaft, an O-shaped thin ring, an inner side floating sealing ring, an outer side floating sealing ring, an O-shaped thick ring, a shaft arm, a connecting plate and a screw plug. The shaft bush is arranged on a hole wall of a center hole of the wheel body, and the center shaft is arranged in the shaft bush. The outer support is arranged on the outer side face of the wheel body, the inner support is arranged on the inner side face of the wheel body, and the pins are arranged at the connecting positions of the center shaft and the outer support and the inner support. The O-shaped thin ring is arranged on the inner side of the end of the inner support close to the pins, and the O-shaped thick ring is arranged on the inner side of the outer support close to the pins. The inner side floating sealing ring is arranged at the connecting position of the wheel body and the in