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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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