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Subject: Hydro change

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AAm    Posted 08-14-2017 at 20:12:33 [URL] [DELETE]        [Reply] [Email]  
  • Hydro change
  • I have the drains out and will let it drain overnight.
    Don't have any crud in bottom that I can see or feel.
    Fluid was very milky and I got about 7 gal out of it. Water??
    Now what should do besides/before replacing the fluids.


    Tim Daley(MI)    Posted 08-15-2017 at 08:04:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Hydro change
  • Can we assume you have an N-Series Ford Tractor? It helps to always put that info up front when asking questions. Note that the 9N and 2N hydraulics are a bit different than the later 8N and NAA styles. Milky colored hydraulic oil is a definitive sign that it is contaminated with water. Before refilling the system, you might want to inspect the pump for cracks, and try to determine how water got into the system in the first place. Had the tractor been stored outside for a long time uncovered? Was the lift working at all prior to this? Did the lift sustain/hold an implement/load in the UP position for very long? There are most likely other issues with your system so a good root cause problem solving procedure needs to taken. Some tests should have been done prior to draining the system. Here is an article from our HOW-TO's forum on some basic 8N Hydraulic System repairs.

    Tim Daley(MI)

    Greg W    Posted 08-21-2017 at 12:26:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: Hydro change
  • My 640 had an excess of milky trans fluid. It was bad enough it would not shift
    at 20 below zero. I was told condensation would form from the tractor going from
    cold to warm in and out of the shop.
    Maybe the Op's slight milkiness is condensation? I would think it would take a long timer to happen.

    My case was severe and caused by an absent shift boot. I replaced the boot and put a
    plastic shopping bag (held in place by an automotive exhaust donut)over it if it has to sit outside.

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