Cart traveling mechanism for crane

The utility model relates to the technical field of cranes, in particular to a cart traveling mechanism for a crane, which comprises an upper balance beam, a middle balance beam and a trolley frame, two ends of the upper balance beam are hinged with two ends of the trolley frame, and two ends of the middle balance beam are hinged with two ends of the upper balance beam. The upper balance beam, the middle balance beam and the trolley frame are hinged to one another to form a main steel frame, a hydraulic lifter used for replacing wheels is installed on the upper balance beam, and a connecting base is installed on the upper balance beam. According to the mechanism, a driver controls the oil pump to pump lubricating oil in a cab, the lubricating oil is pumped to all lubricating points of the cart walking mechanism, manual filling of workers is not needed, the labor intensity of the workers is reduced, meanwhile, it is guaranteed that the lubricating oil at the lubricating points is fully filled, and through doub