I have some bad news for you. The are not available for download, you can sometimes find one on e-bay, but kinda rare. The actual best place is a Kubota dealer. Believe it or not Kubota views the owners manual as a part for sale. Yep, I don't agree with that idea either, but that is how they see it. Now the shop manual I can see costing money. But the owners manual should be available on their website for download.. But they are not. Sorry.
James K0UA