The straddle crane is designed as diesel generator driving. Alternating current is generated by the diesel generator, coordinated by the micro-electronic control system, instantly adjusted or increased rotation speed of driving generator via frequency converter, therefore realizes variable speed of the whole unit and windlass. Hydraulic steering is adopted for steering system, front & real turning in the meantime, flexible and with minor steering radius. Applications: DFK403 Container Straddle Crane is applied for loading or unloading containers with the spec of 20 feet or 40 feet length, 9 feet 6 inches height, 8 feet width in the container freight station.