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fisher oil

Discussion in 'Fisher Engineering Discussion' started by maverick_935, Oct 16, 2011.

  1. maverick_935

    maverick_935 Junior Member
    from canada
    Messages: 5

    For those of you who use fisher oil have you ever had the oil filter plug up with some kind of slime. It plugs the filter so much that the hydraulics wont work. I put in transmission fluid trying to help it because I have never had a problem with tranny fluid in any other pump system before.

    Any thoughts?
     
  2. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,328

    From what I have read, you are looking for problems by using trans fluid. Try putting a few ounces of Sea Foam Trans Tune in the fluid. That will clean out any build up in the system. Run it for a little while, so it has time to get through the system good. Drain, change the filter and fill with fisher fliud. I'd be concerned with the fact that you are having that issue! How is this getting into the system?? Is it just old fluid?
     
  3. Roadrashron

    Roadrashron Junior Member
    Messages: 5

    My local dealer told me they fill all of the new plows with ATF. They only stock Fisher fluid for the people that like paying for a name...
     
  4. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,212

    Fisher fluid is just ATF in a container with a fisher label
     
  5. neplow

    neplow Junior Member
    Messages: 28

    thats strange. you pour them out side by side they dont look the same..


    Did you know the filters are meant to be changed periodically?
     
  6. Morrissey snow removal

    Morrissey snow removal PlowSite.com Addict
    Messages: 1,799

    i have run trans fluid for yrs in all my plows and never had any problems
     
  7. maverick_935

    maverick_935 Junior Member
    from canada
    Messages: 5

    I have run various size plows and manufacturers for years but I have never seen this king of goo or sludge or whatever it is. The fluid was changed 9 months ago with the same problem. The fluid was really thick and sticky. WE cleaned out the filter but tranny fluid in and it is fine.

    I was just wondering if anyone can explain this or has seen it before.
     
  8. Raconteur

    Raconteur Senior Member
    from MA
    Messages: 138

    The slime is from having excessive moisture entering the system . Fisher Fluid is not the same as ATF
     
  9. Raconteur

    Raconteur Senior Member
    from MA
    Messages: 138

    No it isnt .
     
  10. Raconteur

    Raconteur Senior Member
    from MA
    Messages: 138

    Do they carry the warranty after they void Fishers ?
     
  11. maverick_935

    maverick_935 Junior Member
    from canada
    Messages: 5

    I thought the system was closed, how does excessive moisture enter? This is only 9 months and most of it was sitting for the summer. was only used plowing for 2 months. the slime was not normal.
     
  12. nepatsfan

    nepatsfan Senior Member
    Messages: 727

    what is the difference besides the color?
     
  13. JCByrd24

    JCByrd24 Senior Member
    from Maine
    Messages: 232

    Fisher and other plow oils are aviation hydraulic fluid, designed for extreme cold temps. I have previously found the viscosity data of regular ATF and compared it to a plow oil. At 32deg and 0deg the plow oil is significantly thinner. I was a non-believer until I ran it in my meyer e47 for the first time, it was literally twice as fast below 20 degress, and would actually move right away, rather than having to angle back and forth several times in neutral reving to 2000rpms to get the oil warm enough to operate normally. The plow oil also greatly reduces amp draw and head light dimming.

    A plow hydraulic system in theory is closed, but it is not a perfect world. Your rams are most likely covered in snow and ice and when retracted some of that water gets into the system, especially if there are any pits in your chrome.

    As an aside, ATF is fine for underhood systems because of increased temps and power of the belt driven pump. Plow oil should not be used under hood because of lower flash point.
     
  14. nepatsfan

    nepatsfan Senior Member
    Messages: 727

    Good to know. I am not real mechanical and someone told me before that the fisher was better and I always spend a fortune on it for the plows. I am going to stick with it.
     
  15. Arc Burn

    Arc Burn PlowSite.com Addict
    Messages: 1,138

    Your resivoir is metal,if you look at the fill level,it is never really "full",there is around 2 inches at the top that is empty,warm days and cool nights breed condensation in that area and that is how moisture gets in your "closed" system,you'll notice you will usually have rust on that area of the resivoir as well when you take it off.So basically your sludge is a combo of moisture,rust and fluid.
     
  16. Snow Commandor

    Snow Commandor Senior Member
    from 07666
    Messages: 438

    I've used red ATF for years without any problems. I do however believe plow flued will work better in extremely low tempts, due to it's lower viscosity.
     
  17. Thank goodness...a voice of reason. The Fisher oil is superior to ATF in a low temperature situation. Listen guys, don't cheap out on the fluid. It just isn't worth it.
     
  18. maverick_935

    maverick_935 Junior Member
    from canada
    Messages: 5

    apparently the vent was an issue in some of the pump and needs to be replaced with a newer version. I will try that and if it happens again I will go to trans fluid and not look back..
     
  19. Raconteur

    Raconteur Senior Member
    from MA
    Messages: 138

    Sounds like you have found the problem .
     
  20. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,328

    There is a new vent. I still have the old style, that came on the plow, and have never had a problem. Try a couple ounces of Trans Tune as well.