Features: The Challenger hydraulic pipelayer conversions converts the Caterpillar 572 and 583 pipelayers from a mechanical to a hydraulically operated drawworks. The hydraulically driven planetary gear winches will provide smooth precise load handling capabilities with infinitely variable line speeds. This conversion simplifies operator training and improves operational safety. The simple two lever control system reduces operator fatigue. This package can be installed in Challenger Services shop or shipped to the customers site for installation at his facility.