1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

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

    Feb 3, 2019
    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.

    Attached Files:

  2. Dave Neubert

    Dave Neubert Senior Member

    Jul 18, 2018
    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

    Aug 5, 2009
    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

    Dec 11, 2021
    Blair Ne

    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

    Dec 15, 2019
    Jack of all trades/Master of none
    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

    Jan 24, 2019
    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

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