You have four options on that tractor:
1) Tap into the tractor hydraulic system.
2) Rig up a belt drive hydraulic pump.
3) Use the front shaft off of the engine (sounds like you currently have this) to drive the pump.
4) Rear PTO shaft driven hydraulic pump.
Here is a link to a thread on the belt drive system.
I just recently bought a b6000 tractor that gives all the signs of being a great market machine. I bought it with the idea of building a small front loader and backhoe combo to go on it. The thing that I’m getting hung up on right now is how to mount an extra pump to it. By what I’ve been able...
www.orangetractortalks.com
Since you have the front drive system (I assume) in place I would suggest you repair it but that depends on what exactly has failed. I assume that the coupling failed and can be replaced fairly easily.
Please post some pictures of what you have and what failed.