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Allis Chalmers Discussion Forum

Allis B crank pulley

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Author  [Modern View]

04-26-2010 10:03:38

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I am havving trouble keeping the set screw in the crank pully tight. The pulley wants to run towards the front of the tractor rather than against the front seal housing. The later gives enough clearance for the manual crank to kick out once the tractor starts. The set screw will stay tight if I let the pulley go forward and do not use the manual crank. It does have an electric starter which I use all the time. I tightened the locking nut on the set screw extra tight, I hope it holds there.


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04-26-2010 21:09:29

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 Re: Allis B crank pulley in reply to carbonfibers, 04-26-2010 10:03:38  
I have seen a thin piece of aluminum from a beer can placed between the pulley and the crank to act as a wedge to hold it on better.... just an idea... it shouldnt damage anything, it looks like it held for years!
best gw

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Dick L

04-26-2010 13:56:11

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 Re: Allis B crank pulley in reply to carbonfibers, 04-26-2010 10:03:38  
Sounds like it was run loose for a spell. Might need a different pulley unless the crankshaft is now under size from it running loose.
If you can't wiggle it in the crankshaft with your hands you could drill and tap a second hole 90 degrees from the original one. You drill about a 1/4 inch into the crankshaft for the setscrew to seat. Use two shorter setscrews. One to hold the pulley fast and the second one to lock the first one from backing out.

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04-26-2010 17:34:42

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 Re: Allis B crank pulley in reply to Dick L, 04-26-2010 13:56:11  
Thanks Dick, you are right about running loose for many years. That is why when we used the crank it broke free without hurting anything or anyone. I tightened real good on the lock nut this time and let the set screw turn with it. It is holding so far.
The crank shaft, as I remember when I had the crank pulley off for a front seal change, was not worn. If I need one, do they still make these pulleys? I have not seen them on the web. Hopefully I will not need one.

Thanks again,


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04-27-2010 03:27:40

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 Re: Allis B crank pulley in reply to carbonfibers, 04-26-2010 17:34:42  
You can get good used ones from the bone yards. You see them on ebay but no way of knowing if they are better than the one you have until you have it in your hands.

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