[AT] Bush Hog

[szabelski at wildblue.net]

Simply drilling it out might weaken it to the point of snapping under load. You’d have to drill it to a standard bolt size which might be larger than you really want it to be. I would drill it to the minimum size necessary to get it round again and insert a bushing to bring it back to near spec. Then I would weld the bushing in so that you restore some strength to the shaft. Another option would be to drill a new hole 180 from the existing hole and fill in the old hole with weld. Good luck!


Carl

----- Original Message -----
From: Mike M <meulenms at gmx.com>
To: Antique tractor email discussion group <at at lists.antique-tractor.com>
Sent: Tue, 11 May 2021 20:06:11 -0400 (EDT)
Subject: [AT] Bush Hog

Hey Guys, I have a question.  I have an older John Deere Bush hog. I
believe it's a 720 model. I bought it at an auction for $400 bucks and
have used it for 5 years so it doesn't owe me anything. I use it to mow
pasture, not hard use. I'm sick and tired of replacing shear pins. Upon
further inspection the shaft out of the gear box has become ob-longed
over the years, which allows the shear bolt to have some slop in it. Do
I drill out the ob-longed hole and use a larger bolt or what? Any thoughts?

Thanks,
  Mike M

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