Chuck, There is an adapter plate, either HV4944 or HV4945, sold by Tisco, an aftermarket supplier for this purpose. It runs about $80. And installs on the 3pt lift cover under the seat on the rh side in front of the hitch lift lever. There is a 4 bolt cast cover there now. This adapter plate sandwiches between the case and the cover allowing hydraulic access for auxiliary equipment. You need longer metric bolts and ORB hydraulic fittings to hook up your hoses.
I don't know if a diagram comes with the adapter, but I probably have a schematic in an old catalog.
The 1725 doesn't have a particularly large hydraulic pump and the backhoe will be somewhat slow, but this is a setup that is clean and factory agreeable. It will allow the output allowable by the tractor.
As Ductape says, you do need to know how many hoses the backhoe requires to make it work in any case.
Ted