Got this 843 with no history, auction machine not running with U-joint flopping about. Got it home pushed into shop and felt around and found the shaft broke on the hydrostatic pump. Got started tearing it down and plan on pulling the pumps and putting in a new shaft. Noticed a bulge at the rear of the chaincase so pulled the inspection cover, One chain has some damage, RH side. In pulling hoses off pumps haven't noticed any metal. I'll see more when i pull the pump apart. Any hints/experience on what to check on drivetrain (chains, motors, and drive gearboxes). I was planning on draining chaincase and pulling rectangular inspection cover on gearbox. I did ask a pump seller off ebay about the shaft and he said it was rare to have the shaft break. Got me wondering what caused it to snap. I have parts and service manuals looking for source of parts---dealers only?? and an operating manual Can't get back to work on it for a week or so, studying manuals until i get back to wrenching. thanks Tom go to "http://www.mtaonline.net/~bluffcam/843/843.htm" for pictures