You can wait for a picture if you choose, or you can figure it out on your own.
What would I do? Lower the lift arms. With the engine OFF, remove the three plugs from the manifold block. Rotate the spool in the manifold to the power beyond position, and move the lever for the three point to the full raise position. Remove the trans/hydraulic filler plug. Now crank the engine a bit, not trying to start, just crank. Oil should exit one of the ports. This is the pump supply port. Then with a rubber tipped air nozzle, hit one of the other two ports with a quick blast of air. If the pressure bleeds off into the case, this is the sump return port. If the lift arms pop up, this is the pressure "return to system" port.
