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post #1 of 3 Old 05-26-2019, 12:38 PM Thread Starter
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Broken Attachment Bolts on older JD 4030

I am attempting to help the barn owner that our horses are at.
She has/boards 30 horses.
We have been there about 2 years with our horses.
She is 73 and is now by herself, lost husband a year ago.
I now help her as much as I can with things as well as money for repairs, hay .
She has a JD and I think that it is a older 4030 with a Bush Hog loader on it.
As I was moving roll bales the front bar that attaches to the JD dropped down. After looking at it the bolt that attaches the cross bar to the front of the JD sheared off.
I had not noticed this before now but the other bolt at sometime had done the same thing and by the looks of things it broke sometime ago.
There is only two bolts hole on the front of the JD for any attachment.
So i was looking to repair the problem by drilling and re-tapping the two bolt holes on the front of the JD.
Well needless to say that did not work. Unable to drill steel on the JD.
I got a hold of a welder and he has been out twice and leaving telling her that it will take a special type of welding material to make repairs, not sure if he is telling the truth or not.
So question, how can this be repaired?
Tractor is down and the manure is piling up.
Thanks to all for and help solving this issue.
Mark Bell
Plainfield, In
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post #2 of 3 Old 05-26-2019, 01:20 PM
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Re: Broken Attachment Bolts on older JD 4030

The highest grade commonly used bolt is a grade 8. They are tough but drillable. You need better bits. Use oil, a slower speed, less push and patience. I start with as well a centered a punch as possible. Then a new 1/8 bit, then a new 3/16, Then your bits in 16ths from 1/4 up. What size bolts? Bigger bolts are easier to deal with. At a 16th undersize start prying on the remains to pick them off the threads. I don't have a tap and die set and very rarely have to borrow one. Figure on spending a solid 8hrs on this project
Resist using an EZ out. If you snap that you just made the job 10X harder.
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post #3 of 3 Old 05-28-2019, 02:29 PM
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Re: Broken Attachment Bolts on older JD 4030

And, if you get drilled all the way through, put some decent penetrate in through that hole, while drilling up through increments, and let it soak back through the threads from the backside. My favorite is a home made brew of a 50/50 mix of Acetone,and ATF. Works better than anything I've bought of the shelf, including KROIL. If you get of side a bit, just drill until you get close to the threads in the casting. Then take a center punch, or a very small chisel, and collapse that side in. That little bit of heat while drilling my expand/contract the bolt enough to let the penetrate creep to the front. Once you are as big as you can go, you can take a pretty decently pointed center punch, and turn it in the direction to turn it out.

Once you have it out, if you have a tap large enough you can chase the threads,and clean them out. If not, take a same size bolt, and make a couple cross cuts across the threaded end for 1/4" -3/8" making your own thread chaser.

And, I'm pretty much
a stickler for using never-seize on bolts like this. You never know when you'll need to take it apart, or have this happen again.
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