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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Help with a sheared bolt

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Matt

08-06-2003 11:22:24




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so i bought a 550 last week and when i got it i noticed that one of the bolts that holds the chains that stop the lower arms of the 3pt hitch from swinging to the side. Its one of the four bolts that is just around the pto shaft. Is this enough of a description? Well i need to replace it and im wondering if i can just take an extractor and screw it out or do i need to take all the bolts out and unscrew it from the inside (if i can even do that at all). I kind of wanted to know what i was getting into before i started to tear it all apart. Thanks matt

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left hand drill bits

08-07-2003 08:49:35




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 Re: Help with a sheared bolt in reply to Matt, 08-06-2003 11:22:24  
Kitts Industrial Tools 27600 West 8 Mile Road, Farmingtn Hls, MI 48336 (248) 476-2121



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Ollie

08-06-2003 13:01:15




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 Re: Help with a sheared bolt in reply to Matt, 08-06-2003 11:22:24  
Forget the screw extractor. I switched to left-handed drill bits years ago and they work without fail. If you are not aware of the technique involved post back and one of us can fill you in.



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Matt

08-06-2003 17:31:06




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 Re: Re: Help with a sheared bolt in reply to Ollie, 08-06-2003 13:01:15  
Yhea, I guess i could use a little light on the subject. I looked up the left handed bits on the web and seems like they arn't much different than regular bits. Im guessing that they are just the opposite cut and so in the process of drilling out the center of the bolt it grabs ahold and unscrews. How much smaller than the bolt should i go?
thanks for the help
matt
ps so this should just come out? there isn't any nut on the other end inside the tranny?
thanks again

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Ollie

08-06-2003 18:19:59




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 Re: Re: Re: Help with a sheared bolt in reply to Matt, 08-06-2003 17:31:06  
You need a high-torque reversible drill. Select a low speed if yours allows. Drill a small pilot hole dead center with a right hand bit. Then chuck up the left handed bit, reverse the drill, and start to drill. When you make a little progress, jam the drill into the bolt... it will walk back out.

I learned sizes by experience. For example, for a 3/8" bolt, I might use a 1/8" for a pilot and then a 1/4" left hand bit. You want to leave a little meat on the bolt just in case your pilot hole is a little off center then you won't damage the threads. It takes a while to get the hang of this so you might want to practice on some scrap.

I still use a little PB Blaster ahead of time, old habits die hard!

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Shep Va

08-06-2003 13:22:34




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 Re: Re: Help with a sheared bolt in reply to Ollie, 08-06-2003 13:01:15  
I agree, the days of playing with easy outs are over. I use the left handed drill bits like Ollie and if the going really gets tough I got some bolt extracting welding rods from the local welding supply store that are sure to bring a broken bolt or tap out. Those welding rods are the neatest thing and they work every time. Lot easier than drilling and beating to try and get a bolt out too.

Good luck

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Geoffrey in KS

08-06-2003 15:45:08




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 Re: Re: Re: Help with a sheared bolt in reply to Shep Va, 08-06-2003 13:22:34  
Shep,
Explain a little more about the welding rod. I have heard about the left handed drill bits but never aobut this welding rod. I'd be interested in knowing where to get some of it.



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Shep Va

08-08-2003 05:06:38




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 Re: Re: Re: Re: Help with a sheared bolt in reply to Geoffrey in KS, 08-06-2003 15:45:08  
I get these rods at BOC gas or Arcquet (sp) they are two local welding supply stores. The rods are simply called bolt extracting rods, Im sure they have a number but I would have to look when I go up to the shop this weekend.

The rods really work neat, you simply weld onto the bolt that is broken off and weld up the hole in the center if you need to and then weld a nut on the end of the bead and twist the broken bolt out. The welding rod is designed so it just kinda melts and leaves a bead about as big as the rod and it has a whole lot of flux to protect the hole and the threads, so you can weld up the center of the hole and not hurt anything. The rods have a 50,000 pound tinsel strength so they are stronger than the bolts and in fact I have broken a bolt again after welding on to it.

Really neat rods, saves a lot of drilling and banging and I have always had success with them.

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havvey

08-06-2003 15:24:17




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 Re: Re: Re: Help with a sheared bolt in reply to Shep Va, 08-06-2003 13:22:34  
get back to me on the welding rods i have welded a nut on before



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