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John Deere 650H LGP C-frame repair advice

Discussion in 'Dozers' started by John D. Gonzalez, May 21, 2022.

  1. John D. Gonzalez

    John D. Gonzalez New Member

    Joined:
    Feb 3, 2019
    Messages:
    1
    Location:
    Alice, Texas
    Hello everyone, hoping for some advice on some C-frame repair that I need to do again. First time I observed crack that was starting on c-frame, got a nephew to weld some 1/2" plate in hope to reinforce and prevent further running of crack, however, after a few jobs, seems that existing crack is creating enough stress that it broke his welds. At first glance, I was thinking maybe that we should have arc gouged a bit where welding bead is to form for better penetration, however, I'm double guessing the way we mounted plate to begin with, perhaps support differently. Any advice is greatly appreciated and if you have pictures, that would be awesome, Thanks again.
     

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  2. Dave Neubert

    Dave Neubert Senior Member

    Joined:
    Jul 18, 2018
    Messages:
    1,152
    Location:
    Monroe NC
    crack needs to be gouged out and welded the plate that was welded looks like it has no pentation
     
  3. nowing75

    nowing75 Senior Member

    Joined:
    Aug 5, 2009
    Messages:
    805
    Location:
    coatesville indiana
    I agree with Dave. the crack needs to be welded before you put the plate on or its just going to crack again.
     
  4. Bloody Knuckles

    Bloody Knuckles Active Member

    Joined:
    Dec 11, 2021
    Messages:
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    Location:
    Blair Ne
    upload_2022-5-24_13-40-7.jpeg

    As the others mentioned the crack on the side plate and the welds on the inner sides need to be ground out and drill the ends of the weld cracks 1/4" - 5/16" bit. Also all the paint and rust needs to to be ground off in the areas needing welding.
    Weld it up then grind the side plates flush. Chamfer the mating edge of the fish plate before welding them on.
    Just my .02 worth
     
    Jonas302 and Acoals like this.
  5. Acoals

    Acoals Well-Known Member

    Joined:
    Dec 15, 2019
    Messages:
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    Occupation:
    Jack of all trades/Master of none
    Location:
    Wisconsin
    That is a bad crack, like the other guys said it needs to be ground out real good, cleaned well, and then welded. It is going to take more than a pass with a MIG welder though. Probably four or five passes.
    The welding job with the fish plate had almost no penetration, basically just glued the plate on.
     
    56wrench likes this.
  6. JBrady

    JBrady Well-Known Member

    Joined:
    Jan 24, 2019
    Messages:
    193
    Location:
    NE OK
    As others have said, no penetration and insufficient prep work. Here is a picture of a proper fishplate repair. Not my work, just a google image. Fish plate tail out.jpg
     
    56wrench likes this.
  7. 56wrench

    56wrench Senior Member

    Joined:
    Dec 4, 2016
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    1,270
    Location:
    alberta
    And preheat before welding and maybe some post heat for stress-relief and also maybe someone with better welding skills
     
    nowing75 likes this.