If you don't know already,your tractor is 100% Yanmar-made in Japan. You can look up parts on the John Deere site,but they don't cary much for them anymore.(jdparts.deere.com)Their price for the disc is $376.41 and the pressure plate is $292.14!!! There is a clutch kit on Ebay for $163. You can get a clutch from Yanmar Tractor Parts - Shop Online (Yanmar) also.Look down at the bottom of the model list to find John Deere.Lots of other Yanmar dealers carry parts too.
Thanks a lot. I was aware it was Japanese made so its great to go to Yanmar. Is that shaft supposed to stop when you have the clutch depressed? I think the unit will have to be split and a whole new clutch put in.