Bent lift arm

Discussion in 'The Workshop' started by muckymanor, Apr 15, 2019 at 10:02 AM.

  1. muckymanor

    muckymanor Well-Known Member

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    The old man got the tractor and tanker sunk in a boghole last week (well the tractor went down and the tanker stayed afloat). He got a neighbour to pull him out. The lift arms were buried in the ground, so he raised them. The neighbour swung him to try to get him out of the home and the lift arm caught on the tanker drawbar and bent it well. To make matters worse, they couldn't get it out that way (they didn't notice that the lift arm against the drawbar was stopping them from turning, so they swung it the opposite way and slightly bent it too.

    Would someone press a lift arm straight and would it be safe to do so? Or should we be looking at getting replacement ones? I have priced a second hand pair and it ain't pretty!!!!
     
  2. headcase

    headcase Very Senior Member

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    Depends on what you put on the back of the tractor
     
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  3. massey 6480

    massey 6480 Well-Known Member

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    How bent is it .
     
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  4. diesel power

    diesel power Well-Known Member

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    You could heat it and straighten it but don't try to bend it back cold or it'll snap off and god knows which parish it'll land in.
     
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  5. Agri Power

    Agri Power Well-Known Member

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    Christ mucky answer the questions instead of giving the lads blue thumbs, or you just might get the 2 fingers. !!
     
  6. Ozzy Scott

    Ozzy Scott Well-Known Member

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    scrapper for 2 'new' ones, have to be about at handy money
     
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  7. jf 850

    jf 850 Well-Known Member

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    Its rare to see a lift arm bending , they usually snap . And i imagine would snap if you try to straighten it back .
    I welded Dexta lift arms years ago , and used 1/2 thick x 2 1/2 inch angle from a scrap machine as reinforcement underneath.

    As stated above , it really depends what you want to carry with it , and where.
    Transport box or a bale of silo, on your own land , weld it or straighten it .
    2 bales , a fert spreader with 1 ton on a public road , I think you know what answer is.
    A spreader, mower , sprayer or topper won't be worth much after collapsing on the road at 35 kmh. Not to mention the damage caused to another vehicle following behind you.
     
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  8. Kieran97

    Kieran97 Well-Known Member

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    Depends what sort of lift arms, what tractor it was on and what it will he carrying

    Trying to fix it is a double edged sword. It wont go back itself, in engineering terms the material has yielded. If you bend a piece of metal without reaching whats known as the yield point, it will spring back because the bonds between the molecules havent been broken. This is called elastic deformation

    Whats happened the lift arm is the bonds have broke and new bonds reformed. It wont revert to its original form without intervention. This is called plastic deformation.

    No matter what technique is used to straighten it, by and large it will be weaker. Dont do it cold, or it could end up my side of the Shannon. If you have access to gas do it hot. When you heat metal though, it will effect the temper because the heat will change the structure of the material, bringing the carbon to the surface and it will end up brittle. If you hit a bump in the road, it may not be able to give enough to take the shock and break.

    The solution to this is to slow the rate at which the metal cools. This can be done by immersing the metal in sand after heating it.

    The issue is trying to heat it, straighten it, and get it in sand wont be easy.

    If its on something like a 35 carrying a transport box, go for it.

    If its a new tractor carrying a mower or a hedgecutter, new Lift arms would be pocket change compared to the damage that would be sustained if it broke.

    Thats just some guidance on the situation, but i think you'll have to make a decision on this yourself.
     
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  9. muckymanor

    muckymanor Well-Known Member

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    Sorry, I was in a meeting this last while and it wouldn't look good me replying to posts on here in the middle of it.

    Left one bent to approximately 25 degrees from straight and right one to approximately 10 degrees.
     
    Last edited: Apr 15, 2019 at 2:55 PM
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  10. muckymanor

    muckymanor Well-Known Member

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    I don't know if he is way off the ball or not till I go to the NH dealer, but the scrapper that I spoke to wants 500 sterling for the pair!
     
  11. Kieran97

    Kieran97 Well-Known Member

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    For what its worth, Try a very very brief phone call to John Conaty
     
  12. muckymanor

    muckymanor Well-Known Member

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    Will get it pressed and see how it turns out. Don't think it would be good to heat it. If it straightens in the press, we will consider it, if not, then we'll have to invest. It should straighten - it appears to be quite flexible.
     
  13. muckymanor

    muckymanor Well-Known Member

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    He hasn't got it. He told me to press it or go to the dealer
     
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  14. Agri Power

    Agri Power Well-Known Member

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    Right i forgive you.
    Pictures next i suppose..
     
  15. eddie86

    eddie86 Well-Known Member

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    Courtmcsherry tractors?
     
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  16. massey 6480

    massey 6480 Well-Known Member

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    Definitely worth trying to straighten them . But with out heat I doubt the 25deg bent one would straighten without cracking. Remember the steel has stretched when it bent . So when your pressing it you’ll be trying to stretch one side and shrink the otherside of the arm . Heat is your friend in that situation. In the hands of the right man they should get them near perfect I’d say .
     
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  17. johndeere6920s

    johndeere6920s Well-Known Member

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    For the sake of 500 I'd go away and buy them even tho it's sore I know.
    It's alot better than something falling off the back on the road.
    If it was mine it would always be in the back of my head will something happen.
     
  18. AYF

    AYF Well-Known Member

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    Bend the other to 25 then swap the sides over and adjust the stabalisers to suit!
     
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  19. Mf 7715

    Mf 7715 Well-Known Member

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    I'm thinking the same, hedge cutter or double bale carrier wud put serious pressure on already week arms.
     
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  20. denis086

    denis086 Well-Known Member

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    The arm on the mxu here had a very slight bend in it and I noticed a crack below the first hole for the drop arm pin, we got it pressed straight cold, V-ed out the crack nearly full depth a couple of passes of weld grinded it flat and added about 14” of 1” pin steel long under the arm.
    Worked out fine it has a share of work done since. But it was only a very slight bend as in 5deg and there was a bit of work getting it dead straight again, it’s like spring steel. I don’t think I’d have chanced it if it was much worse but new was big bucks and there weren’t many broken at the time.
     
  21. Bog Man

    Bog Man Well-Known Member

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    This was my solution in 1990 to breaking lift arms on the Ford 7700 . They have not broken since. I also welded cat 111 onto the TW 15 .
    E0056E3D-D5C5-4BCF-A312-4F1F0BE9C88E.jpeg 2E76E1DA-03C2-44BD-9389-13F0EB9883DC.jpeg
     
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  22. Bcl

    Bcl Well-Known Member

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    You won't get anything but a brief phone call off John conaty! Students doing pr/customer relations should be sent to him for a day to learn how to answer a phone!
     
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  23. Agri Power

    Agri Power Well-Known Member

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    Is she a hedge row tractor now
     
  24. Ozzy Scott

    Ozzy Scott Well-Known Member

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    keep trying around, whats the make and model of tractor, never know someone here might know one scraped. too dangerous a item to go doing a handy way out. Chalk it down to something you can do with you get to your senior years. I cant wait until I then have a licence to make complete balls of things
     
  25. jc1160

    jc1160 Well-Known Member

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    Another option is to talk to your insurance company. If it has comprehensive it should be covered. When talking to them mention the safety aspect of it and they will take it seriously.
     
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