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Allis Chalmers Discussion Forum
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B drawbar bolts, etc.

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mace56

10-31-2005 18:44:15




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Make that 1001 questions.

My B has two 3/4" bolts that will attach the drawbar. I Only see about 1/2" of thread to the bottom. Is that all ya get? Looks like it was tapped then plugged. One side was OK the other has worked on the thread a bit and seems a little loose.
One rear hub was a bit loose at center after I jacked it up. A couple of whacks on the nut and it seemed to tighten up OK. I'll have to watch it. Same side that had loose rim clamps I am patching up.

Thanks again folks.

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Dick L

11-01-2005 13:11:16




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 Re: B drawbar bolts, etc. in reply to mace56, 10-31-2005 18:44:15  
The rule of thumb on bolts is that you need 1/2 inch of threads for maximum strength with a 1/2 bolt. Th e same would go for the 3/4 inch bolt which would 3/4 inch of threads. With the tractor coming from the factory with 1/2 inch bolts and if I remember correctly they were over 5/8 inch deep. You would have all the strength needed with a 1/2 of inch threads on the 3/4 inch bolt. The ones I have repaired I have drilled and taped for 5/8 inch bolts. You then have to drill out the drawbar bracket for what ever bolt size you use. I use thread repair inserts here at the plant on stripped out holes. Most of our presses are metric and I don"t have any standard ones to try. With the repair inserts you can keep the original bolt size. Much like a Heili coil only stronger.

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cbp

10-31-2005 19:05:57




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 Re: B drawbar bolts, etc. in reply to mace56, 10-31-2005 18:44:15  
It's stretching my memory but I think your right. 1/2 inch on a coarse 3/4 is some serious strength for a small machine. As far as the threads being damaged, that is a problem. I don't remember how much material is available on the inside but I might be tempted to pop the final and weld a rounded three quarter nut in place if it were really damaged. One C I had continued to work for a long time after I had to drill the bolt out and clean the threads best I could. It never failed.

On the looseness, if you are saying the shaft has serious play, now is the time to fix it. The seals and bearings are available from agco. I don't think YT has them but you could check. I don't recall it being a lot of fun but it was the only way I could get rid of the grinding under load and I knew that wasn't good. People would use grease instead of oil to extend the life but by the time I replaced these, the seals were slivers and wouldn't have held any gear oil. I just remember a lot of pounding and cussing to get them out ;-).

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mace56

10-31-2005 19:27:17




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 Re: B wheel looseness and drawbar bolts in reply to cbp, 10-31-2005 19:05:57  
too early to tell but I will check shaft. Most of the clunks were probably hub and rim moving, not grinding or gear errors. Once that is quiet maybe I can hear other stuff at high speeds! lol

So far I have been pretty easy on it due to wheel issues.

Just checking drawbar bolts, wanted to make sure I was not missing something. It will probably tighten OK once drawbar in place.



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cbp

10-31-2005 19:38:40




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 Re: B wheel looseness and drawbar bolts in reply to mace56, 10-31-2005 19:27:17  
The grinding I mentioned was really pronounced. The kinda thing that made you cringe... you knew something was getting hurt.

Chances are you aren't plowing with it and duty is light for most of our B's. Just talking about this, I was thinking about getting my perfectly restored one out of the barn (after some serious dusting ;-)) and dragging the driveway. It really gets the motivation going. They are sweet little machines. I've got an IB too that I really need to restore. It's like a B all compressed together, hardly larger than a garden tractor yet it's still all "B". If I just had some time!

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mace56

10-31-2005 19:59:49




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 Re: B wheel looseness and drawbar bolts in reply to cbp, 10-31-2005 19:38:40  
I was amazed the little B went in my 7' garage door. I did not even need a haircut to fit.

Now I just need to collect enough jacks and tall stands to work on it safely. Even little tractor have some big parts to handle.



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