I am wondering if anyone has any suggestions on what device I should get to fill fluid back into the transmission case.

The drain screw is very accessible, but the fill screw is on top, very close to the body. Perhaps some type of fluid pump or hose with a valve on the end.
I have the 710K and should probably change all the gear fluids.
My Manuals are German/French (I have basic german reading skills, but they dont seem to give any suggestions as to what is needed!
Thanks For any help!
Nomad