On a 3710 it's a Husco valve- power beyond port is 1/2" it takes a straight thread o-ring type fitting
Also note that hydraulic circut can be taped at rear right side of case- you will see a triangle shape cover block-this is where the kubota remotes bolt on- on gearmore top and tilt kit they just made a alluminum block drilled for oil passage and fittings and bolt it on where the triangle block was, return is connected to a nearby hole that has a rubber plug in it