JD 314 Hydrostat Problems (Help Anyone?)

Hey all. I recently purchased an older JD314 as a fun rebuild project. It smoked a little and leaked a little hydrostatic fluid right off the bat. I did the rebuild a couple months after I bought it and everything seemed to work fine until I started to notice a huge decrease in power that would occur after the engine had warmed up. A few weeks later, I discovered my tractor sitting in a pool of hydrostatic fluid.

Could my power loss problem be related to a failing hydrostat, or are these most likely separate issues?

Also, does anyone know if these hydrostats can be rebuilt / have access to a service manual?

Any suggestions would be helpful.
Thanks