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| Well when I got to editing the web page I found two of the three and the one new one was the one in the index that I hadn't found before. Seems the service bulletins aren't exactly in numeric order in the binder. I need to correct that for future searches.
The newly found bulletin shows some potentially sticking valves that could be a cause of hydraulic loss in side console tractors. The other two bulletins show some test techniques for identifying a leak problem and finding that leak, probably a valve. One test heats the oil and checks for pressure and if pressure can't stay up 5 minutes says there is a leak to be found and fixed. The other prescribes plumbing changes at the cooler and reservoir which apparently in the side console tractor are separate pieces of hardware. The T69-3, T70-10, and T71-2-3 on the tops of the pages show the two digit year and month of each bulletin which I have posted in chronological order.
http://www.geraldj.networkiowa.com/4020si.html
Gerald J. | |
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John Deere 4020 hydraulic problem
