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 - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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