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Backhoe thumb

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  • Backhoe thumb

    i was wondering if anyone has plans for a mechanical thumb for a backhoe??

  • #2
    I don't have plans but have worked with a number of machines with them. Are you thinking of a fixed thumb or a hydraulicly actuated thumb?


    • #3
      My father in law has been lusting for one for a while now.


      • #4
        I was thinking more on the lines of a fixed thumb for a 580D Case


        • #5
          Personally I would not use a telescoping brace. Remember that all your bucket thrust will be trying to collapse the brace. You will need a good sized pin to prevent this. On large machines they often have multiple holes for adjustment.

          This one attaches to the boom on both points. I would be careful about bending the boom with one of these.
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          Here's a drawing with some dimensions I found for this style.

          This drawing uses a single mounting plate base that will stiffen the boom if you mount the entire unit to the boom.
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          Most I have worked with use the bucket pin as the pivot, like that shown in the pict by Iron head. You can get the correct size bushings ( replacement bucket bushings) and a longer pin from Case to do this. Use a good heavy plate for the jaw 3/4"+ and cut some serrations on it to grab material. A hook or lip at the bottom works well if you plan on using it to pluck curb or sidewalk.

          Here's a couple more things that might help. These are on a Case so they may work best for your application.
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          Hope these help.


          • #6
            Thanks's everyone you have been a great help as usual


            • #7
              CAD drawing

              Go to

              then click the link the model size you need and you can see some good pictures and info. There is some good info at that site.



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