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OUCH!!! Sheared bolt!!!

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Tim Malin

04-07-2002 15:35:15




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This is the first time in a while I have asked for help on this forum. I was in the process of repairing a worn drawbar on my SM yesterday when I twisted the head right off a bolt. It was a 9/16, if that helps. How do I remove the rest of the bolt? I am REALLY in a pinch, so information would be helpful. Thanks all.




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anoth..anoth.. another way

04-07-2002 20:27:25




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Drill it with a left hand drill bit and sometimes it will grab and unscrew the bolt. If it doesn't then you are set up to put in a Helicoil and get it back to the original size.



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FM..Another, Another way..

04-07-2002 20:09:55




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
If you can get at it with one, try a pipe wrench. That is my first choice when I can get at somethine. Before doing anything, PUT A GOOD PENETRATING OIL ON. I like PB Blaster, but there are many others.



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Another way

04-07-2002 18:32:19




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Tim I have seen welders lay washer over broken bolt weld washer to bolt then weld nut to washer and screw it right out. A skilled welder can have broken bolt out before you can start to drill it out. Have seen dozens removed this way with very few failures.



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ScottyNY

04-07-2002 18:29:28




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Just chiming in to second the motion. Take it easy with the EZout. BTDT. There's really not anything much stronger or effective than the head of a bolt for removing the bolt. If the bolthead sheared off, the threads are stuck but good. The EZ out will give you a bite, but not really anything stronger than the bolthead would have. Whegther with the EZout alone or with a Vise-grip along with it, heat and penetrating lubricants are your best first try. If you wind up having to drill, the advice to make sure that first strike with the punch is centered is some of the best you will ever get. Good luck. Scotty

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Farmer Bob

04-07-2002 18:10:24




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Tim, It may be easier to remove that whole casting from underneath the tractor to work on getting your broken bolt out. Take a correct sized socket and a quality breaker bar preferably a 3/4"drive and you will be able to remove the three large bolts holding the casting to the bottom of the torquetube. Once its off then you can work at drilling out the broken off bolt for the pin retainer.



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The Dukester

04-07-2002 17:20:56




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Rather than make a mess of the job working upside down, it might be easier to remove the entire bracket from the tractor main transmission/rearend housing and tackle the broken off cap screw on the bench--just a suggestion.



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Tim Malin TO ALL OF YOU

04-07-2002 16:58:56




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
The bolt is located:
There is a large, probably 1 and a half inch diameter pin where the drawbar itself connects to the tractor straight underneath. When the pin is in place, a 9/16 headed bolt goes into the casting with a small 1x1 inch piece of flat steel to hold the large pin up. It doesn't take much, so it isn't much. However, I may be able to try with a vice-grips, but I think the easy out might by the way to go. Keep the responses coming, I learn something new with each one.

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Bill Ramsey

04-07-2002 16:52:13




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Tim
I've had pretty good luck with using a left handed drill bit. NAPA carries them. As you drill it out the bit heats it as you drill and sometimes it will come out with the drillbit if not the go to the Easy Out. might work.
Bill



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Michael Soldan

04-07-2002 16:42:12




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Ouch Tim. Where was the bolt, it must be siezed in tight or it wouldn't have sheared. I would start by heating the remainder of the bolt red hot and then dousing it with cold water. Then take a center punch and punch a mark in the dead center of the bolt, this is the most important part of the process. Then drill a small hole into the bolt , straight and well into the bolt. Go up a few sizes till you can get a good quality easy out into the hole. I prefer square shafted easy outs as they seem to bite in better , but a good easy out will work. If you still can't budge the bolt go back to heating it and the area around it red hot , douse and try again. Now you can use penetrants as well to help. Go easy, you don't want to snap the easy out off or you will have one H of a time trying to drill it out. The problem is the bolt siezed in the hole ,not the fact that the head is gone so work from that theory...get the bolt to unsieze and the easy out will bring it. Let us know how it goes . Also is there enough of the bolt sticking out to get a vise grip on?..even if there is ,use the easy out in combination with the vise grip...good luck from Mike in Exeter Ontario

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shannon

04-08-2002 07:17:38




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 Re: Re: OUCH!!! Sheared bolt!!! in reply to Michael Soldan, 04-07-2002 16:42:12  
i would avoid the water and use an oil instead. water is such a good conductor of heat that it is possible, however not likely, to crack your casting. the water will cool the outside of the cast while the inside stays hot creating thermal stress. oil on the other hand has a lower heat capicity than water and is safer to cool somthing with, plus as an added benifit some oil may be sucked in around the threads by capilary action as it cools.

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Hugh MacKay

04-07-2002 16:30:28




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 Re: OUCH!!! Sheared bolt!!! in reply to Tim Malin, 04-07-2002 15:35:15  
Tim: Trying to figure which bolt, it must be bolt into casting or you wouldn't be in trouble. While your figuring what to do put penetrating fluid on. Probably your best bet is centre punch bolt drill it and use easy-out. Your probably going to need heat. There are acetylene guys that can burn bolt with torch and not hurt casting. They are few and far between, and I think they would need quite strong credentials before I would let them try. Hugh

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