A lot of the parts manuals on ebay are poor copies of bad copies and then digitized. Some are virtually illegible. Also some of the internet manual advertisers are real scammers/phishers and/or have the same problem with quality. So be careful there. Hard to tell you get it.
When looking for manuals on anything I always try the manufacturer of the product first. Amazing how many have then available for free download in PDF these days. Been there and done that in all of the above as I have bought a lot of used stuff that I need the manual for.
Kubota manuals should be available from the Dealers, probably have to order them. That is where I got mine, paper though. I never take the paper copy to the shop or outside. Copy the pertinent pages. Messicks (a TBN supporter) may have copies of older models, they are very responsive. In time Kubota may follow the company they just bought, Land Pride, they had/have all their manuals on line. I have even used manuals to build my own items using some of their unique parts and fabricating the others.
I would not be w/o my WSM and Parts manuals. They have saved me many times their cost. I made the manuals a condition of buying my new BX as I knew I would be doing my own work a lot; they threw them in the deal at no cost. The Parts manual is invaluable when ordering parts by phone or email. Just the proper nomenclature saves a lot of frustration and then getting the wrong part.
I get a kick out of folks asking us who invested in our manuals for copies of pages. Once in awhile I will bite when I feel sorry for a guy in a real time bind; but I am also sorry, if you can afford a $20K machine you can surely afford $200 for the manuals. Don't get me wrong; I still try to be helpful where I can.
I think I will start a new post on this manual thing using this dialog as a base; might be educational.
Ron