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cutting edge keeps getting dirt and snow packed behind it

Discussion in 'Fisher Engineering Discussion' started by dprender08, Jan 30, 2015.

  1. dprender08

    dprender08 Junior Member
    Messages: 5

    8' MM2 straight blade, noticed after the first storm back in November that the cutting edge had dirt packed behind it from the bottom of the plow causing it to seperate from the plow. Took it off and cleaned each surface fully and reinstalled. Noticed it doing the same thing again while out plowing today. Any ideas why this is happening?
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    What are you plowing, dirt? How tight are your cutting edge bolts? Might need to put up pics
  3. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,288

    I'm going with diesel cutting edge bolts aren't tight.I would raise the plow and look between the cutting edge and the blade to see if a rock or something is in there.Bolts should be tight.They are not your average carriage bolt you find at Home Depot they are a grade 5 some people use grade 8 and you would have to get them at the dealer or tractor supply.
  4. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,288

    This is what they should look like

  5. dprender08

    dprender08 Junior Member
    Messages: 5

    They are actual plow cutting edge bolts that came with the plow. The edge was taken off, cleaned and bolts tightened up evenly across the plowm. I have a pic. I cant figure out how to upload it from the phone but when i get back to a computer i will
  6. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    Is the moldboard bent?
    Are the holes dimpled out?
    Are you.starting at the middle and working your way towards the ends?
  7. dprender08

    dprender08 Junior Member
    Messages: 5

    Moldboard doesnt appear to be bent, holes are not messed up and yes starting in the middle and working out...the bolts arent loose. It is just pushing the edge up and out from the bottom

    Last edited: Jan 31, 2015
  8. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    Well to start with, I'm saying you need a new edge.
  9. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    What looks like is happening the trip edge is now longer then the cutting edge and its picking up small stones and pushing the worn cutting edge out. So replace it. Then you;ll have a real bulldozer pushing that gravel/
  10. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,288

    I agree with the posts above,time for a new edge.Every cutting edge I've ever got came with new bolts so make sure you get new bolts.You would be amazed how much better the plow scrapes with a new edge
  11. mackclmodel

    mackclmodel Senior Member
    Messages: 164

    To the OP take that cutting edge off. Your supposed to wear that base angle down to about 1"-1.5" below the bolt holes. Why would the guy replace a 6" cutting edge that has 5" of material left
  12. dprender08

    dprender08 Junior Member
    Messages: 5

    Yea I have read about wearing the trip edge down first. The thing is that when the edge is cleaned up and reattached it hangs down 3/8 to 1/2 inch so I wouldnt think the tripedge would be cutting in a forcing material up behind it. I guess we'll try taking it off and wearing the trip some and try again. Thanks for all the help
  13. quigleysiding

    quigleysiding PlowSite.com Addict
    Messages: 1,129

    When you set the plow down is the a frame level.? The angle doesnt look right or maybe its just the pics
  14. Defcon 5

    Defcon 5 2000 Club Member
    Messages: 2,923

    Take the cutting edge off and buy a new one......Before you install the new edges...Clean the trip edge and run a grinder on it...Make sure the factory edge is clean and clear of any debris..
  15. quigleysiding

    quigleysiding PlowSite.com Addict
    Messages: 1,129

    Yup I hit mine with the grinder works good
  16. 90plow

    90plow Senior Member
    Messages: 739

    First thing I saw is how new the trip edge is. It needs to be worn down before an edge is put on as others have said. No need for a new edge or any edge for the time being.
  17. MOXIE

    MOXIE Member
    Messages: 38

    Fisher cutting edges

    First off, If the "attack" angle is wrong, correct it. The base 'A" frame should be level with the plow on the ground. When replacing an edge, it is very important to grind off old paint and rust from trip edge. There will be a "wire edge" on the bottom that has to be ground off. The new edge has to have 100% contact with the trip edge, or the bolts will come loose as the edge pounds down the wire edge. I also grind flat the area of the new edge where the holes are punched. If the punches are worn when they punch the holes at the factory, they will leave a bulge where they came thru. If you do not remove this "tear out" the bolts will feel tight, but will come loose. When tightening the bolts I use an impact, with a mark on the socket so I can see when it stops. While tightening I hit the head of the bolt with a BFH ( big f....... hammer and watch the socket, it will tighten some more.
    If you want to extend the life of your edge, you can match drill the cutting edge 1.5" down from the original holes. When your edge wears, just move it down, using new bolts and the same cleaning as you did when replacing the old edge. Now when you junk an edge, it is only 3"" wide.