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  1. #1
    Join Date
    Aug 2008
    Location
    Thetford VT
    Posts
    64

    Default Excavator Boom Busted

    Got a call today for a crack in 490 John Deere Excavator Dipper boom.
    Almost completely broke off.
    Attached Images Attached Images
    Chad
    -----------
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  2. #2
    Join Date
    Apr 2008
    Location
    JACKSON, MS
    Posts
    86

    Default snapped stick

    that looks like fun.........there was a post in the last couple days concerning a broken excavator stick and the pros and cons of fish plates on top and bottom or on the sides...........it was labeled something like metal surgery i think.

    i look forward to watching the progress of your repairs.

    good luck,

    jim
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  3. #3
    turbo38t Guest

    Default

    Nice.....I repair lots of those.....looks like it's right at the end of a repair?
    Quote Originally Posted by W Welding View Post
    Got a call today for a crack in 490 John Deere Excavator Dipper boom.
    Almost completely broke off.

  4. #4
    Join Date
    Dec 2009
    Location
    Williams Lake, British Columbia
    Posts
    722

    Default

    I've seen one of those not too long ago . Look on my metal surgery thread.
    You can see exactly why the boom failed. The add-on cylinder anchor plate look like it was welded right across the top and that little fishplate design is not really properly design and welded.
    Good luck with the project. I love doing this kind of job. Keep posting the progress.

  5. #5
    Join Date
    May 2007
    Location
    Grande Prairie, Alberta Canada
    Posts
    729

    Default

    Yup, my thoughts were very similiar to Daniel's when I viewed the pictures.... Kind of a No-Brainer having a failure right where all the lines of stress are concentrated.

    Previous re-pads are completely wrong - Sharp corners are a really bad idea. Should have been larger to spread out the load over the entire side of the boom.

    I am terrible with drawing diagrams and posting them. but as mentioned, we have another thread on here illustrating a MUCH better design for re-pads (fish plating) for a repair like that.

    Keep us posted.
    Later,
    Jason

    Professional Spark Generator by Trade.

  6. #6
    Join Date
    Aug 2007
    Location
    arkansas
    Posts
    781

    Default

    NICE!!! I live everyday of my life to find projects like that. last week (i didnt take any pics, but should have) i came across a 330 link-belt and they tore the boom foot right outta the boom.... clearing trees sideways.... that was a fun time for me.... need any help? i travel...lol
    welder_one

    nothing fancy, just a few hot glue guns for metal
    www.sicfabrications.com

  7. #7
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,854

    Default

    Most of the time you get a call. "Can you come fix my machine? Operator says it has a small crack in it. Shouldn't take more than an hour or two." Have fun.
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  8. #8
    Join Date
    Aug 2008
    Location
    Thetford VT
    Posts
    64

    Default Progress

    Made progrees today on the repair. Boom was twisted and rolled.
    Go it lined back up, cut out area around cracks.
    Welded backing plates in, started repairing the cracks. Had to remove 4" on right side from jagged crack replace with a new piece. Welded both sides up clamped and tacked side fish plates on.
    Tomorrow will remove the thumd cylinder attach fitting, repair crack install new plate on front and reinstall thumb attach fitting.
    Thanks for all the comments guys.
    Attached Images Attached Images
    Chad
    -----------
    Trailblazer 302
    Suitcase 12 RC
    S22P-12 Feeder
    HF-251-2
    Spoolmatic 30A
    Maxstar 200 DX
    Shopmaster 300
    S-22A Feeder
    Coolmate 3
    Trailblazer 250G

  9. #9
    Join Date
    May 2007
    Location
    Grande Prairie, Alberta Canada
    Posts
    729

    Default

    Much Better... MUCH, MUCH, Better....

    Only comment I would have is Don't be affraid to put LARGER holes (2" - 3") in a fish plate of that size to weld it to the boom.

    I probably would have put 3 equally spaced 3" holes in a piece of that size, but that is just ME...

    As it stands, I will still give you 10/10 over the previous repairs.

    Keep it up.

    Hey, WHERE are the pictures of the welding truck in the background? LOL
    Later,
    Jason

    Professional Spark Generator by Trade.

  10. #10
    Join Date
    Feb 2010
    Location
    Houston, Tx.
    Posts
    378

    Default

    Quote Originally Posted by W Welding View Post
    Made progrees today on the repair. Boom was twisted and rolled.
    Go it lined back up, cut out area around cracks.
    Welded backing plates in, started repairing the cracks. Had to remove 4" on right side from jagged crack replace with a new piece. Welded both sides up clamped and tacked side fish plates on.
    Tomorrow will remove the thumd cylinder attach fitting, repair crack install new plate on front and reinstall thumb attach fitting.
    Thanks for all the comments guys.
    Now that's a fishplate! Nice work.

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