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In Reply to: john deere 2140 1986 hydraulic problems posted by Gary Tuer on Monday, March 24, 2008:
Sounds like the hydraulics have been seriously overlooked for awhile. Iron filings aren't a good sign, I would expect some brake material too, if the oil was that bad. Flushing out the rear end would be a good idea, ie drain the oil, put in 10L of diesel, drain, repeat a few times at the 2 drain plugs and the screen. If it still doesn't get any better, then the transmission oil pump is likely worn, which supplies the main pump. Those tractors were never meant to run big cylinders like on a trailer. The transmission pump flow is barely enough to keep up with the main pump, even new, that's why there's a reservoir up front to help keep up with the demand. Once the reservoir is empty, is when your hydraulics start chattering, and it doesn't get filled up again until you stop using hydraulics.