My friend HARRYS got a 646 hes had forever.Its a nice little tractor,but its getting tired.Iam gonna attempt to rebuild his 2 cylinder ONAN this summer.It also needs a litle work to the hydro tranny.Im usually on the kubota side of TBN,but i thought id hook up with you guys and see if you can steer me in the right direction for a parts manual,advise,tips etc.I tryed to talk him into a newer tractor,but he loves the thing to death and is 75 years old and stuck in his ways I will admit he does move alot of snow with that little front end loader.So whos got one?