Well i dont know what to tell you all, but i tried plugging my hoses into every different rear port i had and i could not get the single acting cylinder to retract....especially when i lifted the 3 point.
With the return line that my dealer had me install, it work like it was designed to do.
JJ, the fitting and connector that the dealer had me add goes to one of the hoses on the post hole assist cylinder, and the other hose from the cylinder goes to the upper rear remote port from my NON-detente style rear remote controls. When i pull up on the lever, the single acting cylinder extends, and as i lift the 3 point, it collapses the cylinder. This way i dont have to control the rear remotes at all during lifting of the 3 point. [--It should have worked without it if you lifted the 3ph at the same time you valved "retract" to the remote].