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Hydraulic Fluid Leak

Discussion in 'Fisher Engineering Discussion' started by macplee, Mar 2, 2009.

  1. macplee

    macplee Junior Member
    from Boston
    Messages: 19

    After I plow my driveway with my MMI, I notice there there are drips of hydraulic fluid on the snow. I parked the truck, move the blade from left and right and noticed the same thing. Fluid is leaking slightly, nothing big, just a few drops. The nuts feels tight, what should I do?

    Any Fisher experts here?
     
  2. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Figure out where exactly its coming from first!
     
  3. macplee

    macplee Junior Member
    from Boston
    Messages: 19

    Sorry, I forgot to mention that. The fluid is comes from the left and right hydraulic pistons (both). I see drops under each piston after I operate the plow.

    Is the packing nut or a seal that needs replacement?
     
  4. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    You can try tightening the packing nut. If that doesnt work, then i would replace the packing seal.

    The rods arent pitted or rusted are they?
     
  5. macplee

    macplee Junior Member
    from Boston
    Messages: 19

    Everything looks good. I tried turning the nuts but they are pretty tight already. May be too tight. I will try replacing the packing seal. Is that easy to do? Or do I need to have it done by a Fisher dealer? Also, would a large plumber's wrench the right tool to remove/tighten the nuts? Is there a special tool for this?

    Sorry, I am new to plowing. This is my first plow and truck. Thanks for your help.
     
  6. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Large pipe wrench is the tool of choice. Make sure that the rods dont have any pits, rust or scale on them or changing the packing will be a wast of time since you will end up with the same problem. You can get the packing nut with seals in a kit. Not hard to do if the old nut comes out. Many have to file or grind the area on the rod where the pin goes through to keep from tearing up the new seals when you install them.

    http://www.fisherplows.com/pdf/20751_031203.pdf

    Heres link to show you the breakdown of the cylinders.
     
    Last edited: Mar 3, 2009
  7. macplee

    macplee Junior Member
    from Boston
    Messages: 19

    Crash935, thanks for your help, I will look into the parts and steps a bit more to make sure I don't mess things up. Thanks.