dont know of any site of where you can download a manual for these tractors.you can try contacting the links above and be able to get a photocopy of a manual for your tractor.pricing and shipping will have to be quoted from them too.
sorry for the rude awakeing but your tractor is what is called a gray tractor meaning that is was bought from japan used and sold here for pretty much below what you would pay for a john deere or other popular brands.go to the link :- www.satohparts.com and read up on gray tractors.