When you say that the hydraulics don't work, do you mean the 3-point, or the remotes, or both?
Bad news is that the PTO and hydraulics are not related to each other if the dual power works good. The only thing the two systems share is the shaft that drives the pumps, and it is obviously OK if the dual power works. The PTO not stopping is almost a "standard feature" on those models. However, they usually drive just fine, especially the low-powered TW10.