It goes something like this. In an open center hydraulic system whenever valves are connected in series (like a loader valve, extra remote valves, etc) they SHOULD be connected in a power beyond configuration. I think MOST people who understand much about hydraulics would agree to that theory, although there are plenty who claim they don't see the need, they have one or more that aren't that way, have been for years without a problem, on and on. To each his own. When ever I add, reconfigure, or otherwise change anything related to valves on open center systems I do it this way. It can solve or prevent certain issues with downstream circuits as well as reduce pressure on the O rings you just replaced.
If you take the time to read through some of this it might help explain the "what and why" of it, maybe help you understand the logic. Then you can decide if you wish to keep your system "as is" or make some changes. Most valves are power beyond capable, I THINK yours is too, from what I saw. It's just a matter of locating a sleeve to fit it. That might be a challenge for someone with no experience at that sort of thing. All that's left at that point is determining a good, accessible port on the tractor for a sump return. That's usually not all that difficult, but sometimes it requires some creative engineering.
The power beyond sleeve prevents subjecting the exhaust or return passages and spool seals of the control valve to back pressure.
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