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Fisher MM1 stopped working tonight

Discussion in 'Fisher Engineering Discussion' started by ChevKid03, Dec 20, 2008.

  1. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    My friend was working his MM1 tonight and his plow just stopped working.. He checked connections and all were good. The plow doesn't move in any direction when activated. You can hear the pump "scream" when you try to move the plow. This "screaming" noise sounds different from what it usually sounds like. Expecting another 6+ Sunday and then another on Christmas Eve.. Any help or advice as to what to look at would be greatly appreciated. :nod:
  2. RepoMan207

    RepoMan207 PlowSite Fanatic
    from Maine
    Messages: 5,031

    what motor do you have on it?
  3. pelletman

    pelletman Junior Member
    from MA
    Messages: 12

    can you tell me what the problem ended up being? My dad has the same problem with his MM1 Series A Pump, serial 37213 on the plow. Thanks Dave
  4. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    I'm going to guess that it wasnt serviced before the season started and its really cold out so it froze up!!!!

    Get it inside and thaw it out, if it works after thawing it out, flush and fill the system.

    And next year, change the fluid BEFORE it starts snowing!!!
  5. 06Sierra

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

    I was talking to a guy today that had the same problem on one of his trucks. When he got new fisher fluid, the guy told him to add a little Sea Foam for trannys to it. He said it worked great and he has had no problems since. Mine is starting to do that sometimes and usually if I let off the button and hit it again it works fine. It was -25 when mine started doing it. Worked fine today but the temps were much warmer.
  6. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    Mine did that in the fall when i went to pull the plow out for the year...popped out each plow side solenoid, cycled them a few times to clear them out and they've been fine since!
  7. tuna

    tuna Senior Member
    Messages: 488

    Mine is doing the same thing.I bought it used and the fluid looks like mud.It has frozen up 3 mornings in a row I have to keep hitting snow banks to loosten it up.I plan to drain the old fluid out this weekend and replace it with new Fisher fluid.I am new to electric plows how do I clean all the gunk out of the valves?
  8. MRBachand

    MRBachand Senior Member
    Messages: 198

    Ever find an answer to this?
  9. SuperdutyShane

    SuperdutyShane PlowSite.com Addict
    Messages: 1,517

    Just buy a new one. :D
  10. abbe

    abbe Senior Member
    from RI
    Messages: 719

    I just picked my plow up, its a mm1, and it went up, barely pivoted to the side, then screamed. i dropped it back down and it wouldnt movie up or side to side again. all it would do is scream. any ideas?
  11. MRBachand

    MRBachand Senior Member
    Messages: 198

    Pretty sure you just have a wireing connection issue between truck and plow.

    Have a helper operate the plow and go wiggle the connectors together where it plugs into the truck.

    Even better to clean them up really good so you don't have the problem again.

    Make sure all your grounds are hooked up on the plow too.
  12. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Jerked alot when yoou tried to angle it?
  13. abbe

    abbe Senior Member
    from RI
    Messages: 719

    Tried cleaning all the connections, had someone wiggle while i poushed the joystick, and it didnt really jerk when i tried to angle it. fluid is full, so its not that. my buddy mentioned the solenoids on the side of the pump are prone to failure?
  14. Chrisxl64

    Chrisxl64 Senior Member
    from CT
    Messages: 574

    Fluid Film all your connections while your at it.
  15. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Got the easy part out of the way if its got fluid.

    Need to check for ground at the coils and if you have a ohm meter check the ohms on each coil, should be around 7 ohms.
  16. abbe

    abbe Senior Member
    from RI
    Messages: 719

    Okay well i short chained it and took it to my buddies shop to sandblast it. this weekend when i get it back together i will check the ohms and report back my findings. thanks guys