You said ..sorry correction. I think it's an open center system
That is not correct. The operators manual for your tractor says on page 33 in a safety warning that your tractor has a 2250psi ..stand-by.. pressure. The term ..stand-by.. is a direct reference to the pressure held in a closed-center system against any valve that would open to use hydraulic flow and pressure. This means your tractor has a closed-center system as Jim indicated. As Jim and I said in my our replies your add on valve needs to be designed as a closed-center valve or convertible to closed-center comparability. Another item not mentioned previously is that if the add on valve has a pressure safety relief valve it needs to be set just above the tractors actual stand-by pressure so it does not constantly relieve oil back to the reservoir.
If you do not have an operators manual you can down load one from JD for free from the linked page. When you find your applicable machine type and model click the arrow pointing sideways so it points down and it shows the operators manuals and other tech manuals. Click the arrow to point down by Op manuals there you can put it in your cart. Also there is a square at the right with the arrow up to the right corner when you click that you can view it. The down arrow with the line under it will down load it to your PC.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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