I have 2 Newholland 851 Chain balers. One baler has autotie and was mostly rebuilt the year I quit using it, new floor, floor chain guides and apron chains. It does need a sprocket and main drive chain replaced. Drive chain would come off occasionally. Sprocket can be removed from parts bailer. Other baler I mainly kept as a spare. It works and has hydraulic controled manual tie. make offer on ea. Many spare parts, some used some new, wooden chain guides, pipes, belts, springs, from parts baler. Many almost new apron chain splices. Don't have time to do it anymore. 785-743-2179 Make reasonable offer.