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Broken Bolts

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Foxtail

12-19-2002 19:02:28




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Bolts that fasten drawbar assembly to bottom of transmission housing on JD A are twisted off. One of them also has a drill bit broken off in it. HELP!




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Heat Houser

02-05-2003 19:08:05




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 Re: Broken Bolts in reply to Foxtail, 12-19-2002 19:02:28  
If you are a good overhead welder you can leave the axle in place. if not unbolt it and flip the bottom up.
Lay a flat washer over the bolt hole,(same size or smaller) and then using E7018 rod, weld to the end of the bolt first and then start catching the washer. After you have a good bond to the washer, select a nut and weld it to the washer. While still hot from the welding process, quench the bolt/washer/nut with water. Using a boxend wrench, start working the bolt back and forth. Should come out.
Do not weld the bolt to the sides of the hole, it ruins your day.
Alternate is to drill a hole through the bolt and then chuck a rotary cutter into a drill and carefully cut down to the threads by hand. Use a tap to remove the thread helix.

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Dennis Stoeser

12-27-2002 19:47:20




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 Re: Broken Bolts in reply to Foxtail, 12-19-2002 19:02:28  
I have succesfully on several ocassions used a (gasp)cutting torch. First the drill bit or easyout or tap is hardened steel and will heat rapidly and when you hit the oxygen that piece will blow out nicely. You can also do the same to the bolt. Granted that you have to be reasonably adept at useing a cutting torch. This will work if you are carefull! Once the offending bolt is out you will have to clean up the threads with a tap. If you are not so lucky you should at least now have a hole you can heli-coil or tap oversize. If this is a thru bolt and it goes into the rear end housing you most definatly will need to drain the oil out first. You do stand a chance for a fire so do have an extinquisher at hand and do be carefull.

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Jerry S

12-26-2002 10:12:30




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 Re: Broken Bolts in reply to Foxtail, 12-19-2002 19:02:28  
A couple thoughts on this one. First, you might consider looking at the other side of the cast they thread into and see if the bolts go all the way into the rear end so you could have access to the top end of the bolt. Second, John Deere A's are kind of plentiful and the rear end housings are not something that sell out of salvage yards all that much compared to other parts. I would seriously look at switching rear ends to another intact axle setup and just move your tires to the new rear end.

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TimC

12-21-2002 11:42:55




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 Re: Broken Bolts in reply to Foxtail, 12-19-2002 19:02:28  
Is enough sticking out to weld a bolt head on to or are they large enough to weld a smaller bolt to. The heat of welding might help loosen the threads.



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t20dude

12-23-2002 12:41:53




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 Re: Re: Broken Bolts in reply to TimC, 12-21-2002 11:42:55  
that's a particular pi the a. The suggestion of a wire-weld lump on top the bit to wind it out with vice grips or a nut is good. I've got my old "can o' worms" which includes a bolt thread embedded with a broke off "easy out"(right)with a broken TiN bit in it drilled out with a sharpened carbide masonry bit. If there is any way to get the foreign material out first before the nightmare begins, do it and save a lot of trouble. HS bits and hard-outs can sometimes be shattered by careful application of minuature hard chisels and the rest is easy.

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