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Allis Chalmers Discussion Forum
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Difference between C and B Allis

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SORNO

05-16-2007 11:29:31




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I recently acquired I believe to be an Allis C tractor that has CA decals on it. I have determined it is not a CA but don't know how to tell a C and a B apart from one another. Could you help me find a source or explain to me what the differences between the two models are?

A little about the tractor, it has a narrow front end, a 3 speed transmission, and a large rectangular seat. The thing that I have had a hard time trying to figure out is the front steering arm, mine is very short say 6" center of where it goes into the tractor and to the center of where the steering arm comes back from the rear of the tractor. If there is anything else you need to help me figure out what model it is let me know and I will get that for you.

Thanks for your help.

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steve(ill)

05-17-2007 16:02:17




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
outside to outside the rear tires should be 56-62 inches for a model B. the C will be atleast 6 ft (72 inches) if not wider. like Dick said, the C will have cast lugs on the alxe housing next to the fenders the the C. the B is too narrow and has the seat, fender and tire shoved up tight aginst each other. the steering arms of the C point up below the gas tank, the B points down. the C has ball joints on the long arm, the B has an adjustable ball socket. B front end steering rod goes to the left wheel, C has a second gear box below the radiator with an arm on it.

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Dick L

05-17-2007 06:57:13




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 Only Picture I Could Find in reply to SORNO, 05-16-2007 11:29:31  
The only picture I could fine with the drawbar on the C.

third party image



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SORNO

05-17-2007 05:19:07




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
I am going to try to get some picture of it this weekend to see if it will help out. This post has helped and also confused me.

It seems to me that I have a B rear end on my tractor with a C front end. The serial number starts with a C but it has all the working of a B on the back side. It doesn't seem to have a very wide rear axle and it has the rounded draw bar. It also has the steering arms pointing up and they are both the shorter versions shown on the B model.

Could some maybe take a measurement of the rear axle from flange to flange, or another spot where I would easily be able to measure, to get the over all width of the rear axles on a B and C model?

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Pappy

05-16-2007 18:52:56




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
Our "B" has the serial number cast into the case right by the gear shift lever. Number will start with a B or C. This ought to help.



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SORNO

05-16-2007 13:50:51




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
I have that big radius draw bar on mine. and the shorter arms of the B model in the picture, but my arms are up and not pointing down.



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Dick L

05-16-2007 13:37:13




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
Picture of B drawbar.

third party image

Another C picture.

third party image



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SORNO

05-16-2007 13:04:06




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
Do you have any picture of a C model and a B model? Do you think you could put a C front end on to a B rear axle?



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Dick L

05-16-2007 13:19:03




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 13:04:06  
This might help. The C is in the foreground.

third party image



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Robert Mull

05-16-2007 12:47:35




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
You have a "C". A "CA" has a four speed forward transmission, spin-out rear wheels, pan seat, foot clutch,and hand clutch in the right rear axle housing , dimpled foor board. A "B" steering arm coming out from under the gas tank points down verses the "C" steering arm pointing up. No "B's were made at the factory with a narrow front end. "C's" had narrow front, single front or adjustable wide fronts. Some "B's" has adjustable wide fronts. Some other differences, but this should be enough to make you an expert at 50 yards.

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Dick L

05-16-2007 13:09:42




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 Hey Robert Mull in reply to Robert Mull, 05-16-2007 12:47:35  
Here is a picture of one of my B"s.

After 60 or so years there is some things that you can never be sure of. I have seen some B"s and C"s that the CA transmission was put in them. I bought a tractor abut six years ago the had the CA rear behind and everything from the transmission forward was a C.

third party image
third party image

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Dick L

05-16-2007 12:40:14




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 Re: Difference between C and B Allis in reply to SORNO, 05-16-2007 11:29:31  
The C is wider in the rear than the B. The final drives on the C has a flat boss front and back between the fenders and the tires has two threaded holes both sides. The drawbar on the B has a constant curve and the C drawbar come back at an angle and then curves back to the other angle. The B is a one row tractor and the C was a two row tractor.
The early C"s had the shorter steering arms.



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