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| Returning the oil to the sump guarantees a problem if you want more than a few gpm. The charge pump in the transmission has a lot less flow than the front pump can supply. This application is not suited for the 4020 hydraulic system. Returning to the oil filter cover or through the remotes does put a couple hundred PSI, the pressure from the charge pump, on the back side of a cylinder. A single acting cylinder won't close with the engine running without more external force on it than I can do by hand.
I have updated the service bulletins on my web page about loss with the clutch pedal pushed in with some on side console tractors too. www,geraldj.netowrkiowa.com/4020si.htm
Gerald J. | |
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JOHN DEERE 4020 HYDRAULICS
