Since you don't have the hydraulic pump that runs off the side of the engine the hydraulic cavity should be dry. If coming from the weep hole then possibly one of your tubes that run from the front plate thru the trans to the rear center housing is leaking. If leaking from the plate then try to replace the O rings. You can replace the lines that run thru the bellhousing or if you can find the leak in the bellhousing you could probably cut and can it off since you are not using the tractors hydraulics to run your loader/backhoe.
I knew a Fred Bear years ago. Bow and arrow guy, Any relation?