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Thread repair

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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Johnny Williams
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Thread repair

Postby Johnny Williams » Sat Mar 15, 2014 5:33 pm

One of the four holes that hold the cultivators to the lower steering housing is stripped on my '61 140. What would be the best repair for this, helicol or keenserts?

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Re: Thread repair

Postby Johnny Williams » Sat Mar 15, 2014 5:54 pm

Never mind! I just had one of those DA moments, just go to the next bolt size and be done with it! Sorry for wasting your time.

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Re: Thread repair

Postby Jim Becker » Sat Mar 15, 2014 5:58 pm

I'd use a helicoil and replace all 4 bolts with setscrews.

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Re: Thread repair

Postby AL Farmall Boy » Sat Mar 15, 2014 8:38 pm

Could you elaborate on the set screw Jim? How does it differ from a standard bolt? What did it originally have?
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Re: Thread repair

Postby Bill Hudson » Sat Mar 15, 2014 8:57 pm

I'm not Jim, however, this is my take on your question. A set screw has a cupped end and does not "mushroom" near as easily as a bolt. A mushroomed bolt can be difficult to remove because of the larger end resulting from the mushrooming. In addition the cupped end actually holds better because that is what it is designed to do.

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Re: Thread repair

Postby Jim Becker » Sat Mar 15, 2014 9:50 pm

Exactly what Bill said. The threads were probably taken out by removing a bolt with a mushroomed end. IH was inconsistent on use of set screws on the Cub, but I think they called it pretty universally on the A through 140 tractors.

Check the bolt description under reference 5 on this page:
http://partstore.caseih.com/us/parts-search.html#epc::mr50170ar1304160
(You may have to hit "print assembly" to see it.)

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Re: Thread repair

Postby Johnny Williams » Sun Mar 16, 2014 8:47 am

OK, after a second look, I am afraid that going to a 3/4" bolt will not leave enough metal so I think that the heli coil option will be the way to go. Thanks for the set screw screw option, it really makes a lot of sense. From the look of the bars this tractor has always had bolts.

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Re: Thread repair

Postby Johnny Williams » Sun Mar 16, 2014 1:09 pm

Just for the sake of knowledge, what size were the bolts, set screws, out of the factory. Mine are 5/8", I bought a used part and those were 1/2".

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Re: Thread repair

Postby Barnyard » Sun Mar 16, 2014 3:54 pm

Johnny Williams wrote:Just for the sake of knowledge, what size were the bolts, set screws, out of the factory. Mine are 5/8", I bought a used part and those were 1/2".

5/8"-11 X 1 1/4"
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Re: Thread repair

Postby t jackson » Sun Mar 16, 2014 6:16 pm

jim shouldn;t there be jam nuts on the set screws also

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Re: Thread repair

Postby Bill Hudson » Sun Mar 16, 2014 6:41 pm

t jackson wrote:jim shouldn;t there be jam nuts on the set screws also


I'm not Jim, however, I use jam nuts. Just seems to make sense to me to use them.

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Re: Thread repair

Postby Jim Becker » Sun Mar 16, 2014 6:51 pm

Bill Hudson wrote:
t jackson wrote:jim shouldn;t there be jam nuts on the set screws also


I'm not Jim, however, I use jam nuts. Just seems to make sense to me to use them.

Bill

Agree. At least some implement manuals explicitly mention the jam nut.

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Re: Thread repair

Postby Boss Hog » Sun Mar 16, 2014 7:05 pm

t jackson wrote:jim shouldn;t there be jam nuts on the set screws also

I have seen quite a few with the lock nuts and a square head, however our 140 that was bought new did not have lock nuts or square heads I believe that would be correct
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Re: Thread repair

Postby AL Farmall Boy » Mon Mar 17, 2014 3:56 pm

Does anyone know of a good source for these special setscrews/bolts? I just looked on McMaster Carr and didn't see anything like them. You'd think they would be a standard peice of hardware.
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Re: Thread repair

Postby Boss Hog » Mon Mar 17, 2014 5:15 pm

AL Farmall Boy wrote:Does anyone know of a good source for these special setscrews/bolts? I just looked on McMaster Carr and didn't see anything like them. You'd think they would be a standard peice of hardware.


I just did a quick search of e bay , that is where I buy mine at, here is a link for some that are a bit long but will work. Search a little and you will find them.
http://www.ebay.com/itm/Square-Head-Cup ... 1c380f2cd0
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