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Fisher plow intermittent lower problem

Discussion in 'Residential Snow Removal' started by pete rose, Dec 16, 2004.

  1. pete rose

    pete rose Junior Member
    from Vermont
    Messages: 6

    I was hoping that someone here could point me in the right direction for wiring diagrams for a 99 fisher SEHP (electric motor hyd) so that I can do a bit of troubleshooting. The plow raises, angles left and right fine, the other night it didn't want to lower a few times. I would like to take a Fluke multimeter and check for the the proper voltage on the pins at the grill mounted harness coupling. That would narrow it down to either the truck installed or plow installed portions. Email is prose@entergy.com or reply here.
    thanks for your help.
    pete rose, (no I'm not the real one.)
     
  2. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    Is this happening in below freezing temps and have you flushed and refilled fluid recently?
     
  3. pete rose

    pete rose Junior Member
    from Vermont
    Messages: 6

    This occured last storm in VT, just a few inches, around the freezing mark. No, I have not changed the fluid recently but I do have an appointment to have a service this Tuesday. Possible storm Monday, so I'd like to have something to look at if it happens during while in use.
    2200 foot driveway, it's a treat to shovel.
     
  4. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    Before I jumped conculsions I would drain and flush fluid and refill with new for starters. The next thing to do would be to check the control harness connections.
     
  5. echovalley

    echovalley Senior Member
    from CT
    Messages: 456

    Check all your connections see if there is any corrosion or moisture.If all is ok make sure u apply some dielectric grease to all your connections.If your pump has atf flush and refill with fisher fluid.
     
  6. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    ATF fluid type is not problem, it works fine in Fisher and western pumps and I have used it for many years too.
     
  7. plowed

    plowed Senior Member
    Messages: 344

    Go to Fisher's website and you can pull the diagrams from there. I did last week and they worked well. Good Luck.
     
  8. pete rose

    pete rose Junior Member
    from Vermont
    Messages: 6

    I cleaned the harness junction terminals, added a little dielectric grease and had no problems while plowing yesterday's storm.
    thanks for the feedback.
    pete
     
  9. pete rose

    pete rose Junior Member
    from Vermont
    Messages: 6

    On the advice of John, I went back to Fisher's site, and downloaded the wiring diagram. In that same area is a great Mechanics Guide. 68 pages of useful material for performing maint and emergency troubleshooting. I'll still leave the maint to the shop (Vassars in Greenfield Mass), it'll be good to have in an emergency.
     
  10. Bayrat

    Bayrat Junior Member
    from usa
    Messages: 26

    My Fisher had micro-switches in the control unit that would regularly go bad. I bought new ones at Radio Shack and soldered them into the circuit board when they burned out. Cost about $2.50 each. They will work intermittently until they finally fail.