I have 2 Newholland 851 Chain balers.  Price is for pair.  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.or take as a pair.  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. Parts baler going for junk soon.  I have sprockets removed from parts baler.  Parts baler has been hauled off for scrap, but I have lots of parts to go with them.