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  1. #1
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,840

    Default Mini excavator stick

    Landscaper broke the stick on his JCB 8018. Pulled the stick off the machine & took it back to my shop. Clamped it to my table & jacked it back straight, vee'd it out & welded it up. Cut side & top plates. For the bottom of the stick (thumb side) I used a pc. of flat bar to extend the thumb base plate. Tried to make the stress point in a better area. Where it broke was where the thumb ended which also happened to be a stress area as the stick transitions be wider. It broke right on the weld for the thumb. Probably been cracked awhile & just got worse until it let go. Not many operators I know do a visual inspection everyday.

    0613041735a.jpg

    0613041735.jpg

    0614041459.jpg

    0614041807.jpg

    0614041808.jpg
    Last edited by MMW; 06-15-2014 at 04:29 AM.
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  2. #2
    Join Date
    May 2008
    Location
    Troy, MI
    Posts
    335

    Default

    I noticed that you contoured the side plates to reduce the stress concentration at the ends of the plates, similar to the original side plates on the upper end of the stick. I was wondering if you also contoured either the top or bottom plates, that you added?

    In any case it looks you made it a lot stronger than it originally was.
    Last edited by Don52; 06-15-2014 at 08:12 AM.

    Miller Thunderbolt
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  3. #3
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    466

    Default

    I run small equipment all the time and visual inspection is critical. We save a lot of downtime by inspecting. When I have new operators I try to instill the idea that inspection is not a once a day task. Every time you are around that machine you need to be looking at it.

    Nice work on the repair. The rounded corners look great. That should hold up for a bit longer now.
    Last edited by elvis; 06-15-2014 at 11:42 AM.
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  4. #4
    Join Date
    Feb 2009
    Location
    Lodi, CA
    Posts
    1,258

    Default

    Nice repair. I realize space was probably limited, were you able to add any material to the top of that dipper?
    Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

  5. #5
    Join Date
    Dec 2013
    Location
    At the epicenter of the Green Mountain Range in VT
    Posts
    275

    Default

    Is that thumb too big for the excavator?

    My friend did exactly the same thing to an excavator he rented for the day. He had some soft limestone ledge. I think he was smashing with it trying to break up ledge. These machines are durable, but not indestructible.

  6. #6
    Join Date
    Aug 2010
    Location
    Rhode Island
    Posts
    24

    Default

    Same thing happened to me on my machine at home last week. Took the day off work to catch up on some things......
    Attached Images Attached Images

  7. #7
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,840

    Default

    On the inside of the stick I put a pc. of 3/8" x 2" flat bar from the top of the thumb to past what I thought would be the new stress point because of the new side plates. This pc. is under tension while digging.

    0616040726.jpg

    I also put a football shaped pc. on the outside of the stick. This did not break originally but bent. It is under compression while digging so I didn't feel the need to make a large pc. here just a small reinforcement of the bent area.

    0616040727.jpg

    I'm not an engineer but try to use common sense & visualize where the new stress point will be after the repair. Hopefully it will be strong enough to survive for a long time.

    Don52 - I did make the ends of all my plates so I wouldn't be welding straight across the stick.
    Last edited by MMW; 06-16-2014 at 06:23 AM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

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