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Bent brush hog disc

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  • Bls repair
    replied
    When I do a job where everything cracked and bent up ,I tell them it’s not going be perfect but I’ll get as good as I can. If you want it perfect you’ll have to get new. Most are good with that

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  • MMW
    replied
    I thought about balance vibration issues. Made sure the blade holder was even at both ends relative to center hub. Also since I didn't really add or subtract any material from the pan it should be ok plus the pan od is pretty equal to the center hub with small variations. The mower is I think 10 foot? It has two discs. Hopefully the other one is undamaged as I did not see it but I will make sure he checks it. I've seen a few of these that are being used in much worse shape than this one when I finished it so I assume it will be fine.

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  • BOBM
    replied
    The shear pins are usually at the gear box PTO shaft .
    It sounds like he had used wrong grade bolt for shear pin.
    My JD brush hog has two swinging blades. I replaced them a few years ago and are 1/2" thick.
    Depending on bend damage, I would be concerned about balance and vibration. The blades on mine spin at 160 MPH according to manual.

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  • MMW
    replied
    In retrospect since about 1/2 of the blade holder welds were cracked already I should of just cut it off and straightened it and the pan seperately, then welded them back together at the end. They kind of fought against each other while straightening plus then I could of straightened the blade holder in the press vs using heat.

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  • MMW
    replied
    First I was mistaken on pan thickness, it is 3/16". Next customer told me a new disc/blade holder from John Deere costs $900. I took a quick look on the interenet for one, used or after market and came up with nothing. I figured about 4 hours to do this, so I am below the 50% mark that is kind of my benchmark for repair or replace on things like this that probably won't come out like new or close to it. Didn't plan on 3/4 hour to remove the old shaft or 20 minutes to straighten one blade. Straightening just took a little bit longer. This is the only pc. the customer dropped off, he is going to get a new shaft and replace it himself, hope he can. No shear pin on the parts I have. Lastly the finished picture looks better than it really came out however it should be fully functional.

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  • BOBM
    replied
    The shaft broke? There should have been a shear pin to save the shaft ? Did you buy new shaft ??

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  • MAC702
    replied
    Originally posted by MMW View Post
    ... ready to go. 5-1/2 hrs.
    Don't get me wrong, as I'm opposed to the disposable society, but what's the cost comparison between the materials and labor on the repair versus a replacement part? Or is lack of replacement parts a greater issue?

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  • ryanjones2150
    replied
    Heatin’ and a beatin’!

    Nice repair.

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  • Bls repair
    replied
    Very nice

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  • MMW
    replied
    This is the final. Had to flip it, block it up and clamp/heat the blade holder one more time. I'll do a quick blade sharpen and bolt them on, ready to go. 5-1/2 hrs.
    Click image for larger version

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  • MMW
    replied


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    final heating/shaping I thought.
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  • MMW
    replied
    Been raining all week so catching up on shop work. First remove blades and shaft stub. The pc of shaft was stubborn. Took a few heating sessions. Next get the blade holder straight. Then start on the pan. Sliced it in two spots to make it easier to straighten. Was tougher than I thought but it's plenty good enough. Last pic is the final heating session to remove any stress.
    Click image for larger version

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  • tarry99
    replied
    walk your field before mowing.............

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  • ryanjones2150
    replied
    That sucker is mint! Bang on it a little bit, shoot some John Deere green paint, good as new!

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  • MMW
    started a topic Bent brush hog disc

    Bent brush hog disc

    This came in today to straighten. 35" dia x 1/4" thick. One of two on the mower. Looks like fun. Tall grass and weeds with a hidden stump, snapped it clean off. New one is $900 from John Deere. Probably won't get to it for awhile but I'll follow up. I think most of the damage was after this shaft broke the other disc beat on it.
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