|new oxford 2-n said: (quoted from post at 23:20:26 09/14/13) I use a drop valve from a Ferguson LU-O-20 loader The oil comes from the test port and returns through the top hole of the side cover. 50+ years ago I literally mowed hundreds of acres of hay using an IH semi mounted mower and this remote to lift the cutter bar. More recently I used it to lift a Sauder snow plow Currently we (tractor and me) are in retirement but I still have the valve mounted on the tractor. It makes a good conversational piece. If I had the expertise, I'd take some pictures and post them or I could send them by text if interested|
Here is a picture of one of the drop valves which came with an old Sauder loader I purchased many years ago. It allows you to raise and lower the loader (or any other SA cylinder) using the 3pt control lever and still required chaining the 3pt down to get the external hydraulics to work. There is no real advantage to it over an ordinary open center control valve plumped into the test port. In fact my loader which had a hydraulic rather than trip bucket was operated using a two spool valve plumbed into the test port and the drop valve was used solely as a return line fitting into the sump.
IMO if you really want to use the internal pump to power a remote valve the best way to do it is with the top cover modification described in the link below. A selector valve and open center control valve installed in the external top cover line gets you one or more a remote ports without chaining the lift down. You can't use the 3pt and the valve simultaneously but you can switch back and forth on the fly without ever leaving the seat. Plus it saves wear and tear on the internal pressure relief valve which gets worked hard by the drop valve setup.Top Cover Modification
This post was edited by TheOldHokie at 09:58:53 09/15/13.