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720, you are probably either looking at a P/S pump that is loosing pressure as the oil warms & thins out or the steering vanes in the lower pedestal leaking & by-passing input pressure. It could be something else but those are the most likely & common.. Both are relatively easy to test for but in both cases are rather a big job to repair.. The pump test is obvious & that takes a pressure gage of around 2000 lbs & high pressure shut-off valve as well as a some fittings to install in the pressure line at the steering bolster top. The by-pass test is even easier but requires the nose grill of the tractor to be removed & the steering valve to steering vane line(s) removed then steering wheel turned & held to one side while watching for the amount of oil that flows out of the non pressurized side. Both are in the Deere steering service manual & should be purchased if you are going to work on that steering system yourself.. Without a proper P/S service manual you could cause expensive damage or miss some part of the operation that is necessary. If that tractor was once good & just started to act up, suspect the above,,, If you purchased that tractor & it hasn�t ever been right you MIGHT try a P/S oil change as it could have some transmission fluid or Deere�s winter P/S fluid in it.. Power Steering Manual __ SM2050 Clooney
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