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 - Picking Corn - by Rick Nikolich. It was the day before Christmas shutdown at work and I asked our lead engineering expert Scott Andrzejewski what he was going to do over the holidays. He said that he had some corn that he still needed to pick with an antique one-row New Idea corn picker. Scott has a nice farm about an hour north of Lansing in St. Johns, MI. He wanted to get the rest of his corn in by the next day (Christmas Eve). We had about an inch of new snow on the ground and single digit temperatures. So in the bac
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