I think barnyard is right on the money about your valve leaking by and letting the loader cylinders settle. The rest of my points do not change this. The valve no matter the type passes fluid when you operate it and then when centered holds that fluid from passing back or captures it in the hose and cylinder. You say you have an ..original.. spool valve. You mean it is an original valve JD would have sold for that loader? I am just wondering if the valve may be an open center valve instead of the correct closed center valve I think that is correct for your tractor. On second thought I believe a 2640 may be a closed center or open depending on the serial number. Has the loader and valve been on the tractor and operating fine or is this a recent install. The response of the return pressurizing means it is an open center system or you have an open center valve on a closed center system.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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