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Allis Chalmers Discussion Forum

B transmission troubles

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Jon Hineman

03-20-2012 18:00:07

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Bought an 1948 Allis "B" the other day. The daughter and I tried to pull-start it this afternoon. When the clutch is released the rear wheels lock up tighter than a snare drum....I know the engine is free because it turns over with the starter. The pto/pulley engages and disengages ok too.

Am I going to have to replace the transmission? Or is there another possible issue??? Thanks in advance!

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03-21-2012 15:17:28

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 Re: B transmission troubles in reply to Jon Hineman, 03-20-2012 18:00:07  
Pull it in 3rd gear...it'll turn over fast enough.

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Dick L

03-21-2012 04:09:34

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 Re: B transmission troubles in reply to Jon Hineman, 03-20-2012 18:00:07  
You (could) have the transmission in a reverse and forward gear at the same time. (If) that would be the problem it can be corrected by removing the side plate and making sure the forks are in the slide gear grooves. (If) that is the problem check the forks for being bent or just plain bad. (If) the forks are bad you can get on ebay quite often.

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Jon Hineman

03-21-2012 07:37:58

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 Re: B transmission troubles in reply to Dick L, 03-21-2012 04:09:34  
Hey thanks ..... I did not know that was possible but it makes sense. I'll check it out.

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willie in mn

03-22-2012 02:19:21

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 Re: B transmission troubles in reply to Jon Hineman, 03-21-2012 07:37:58  
You say in your post that the wheels lock up when clutch is let out. If it rolls at all, whether in neutral or in gear with clutch pushed in, THERE IS NOTHING WRONG WITH THE TRANSMISSION.
You also say that the starter will turn it over, but won't start. A B in tune will start on first or second half turn with the crank. Problem is that to check for vacuum leaks etc it has to be running.
Best way to pull start is in highest gear, 3rd on a B. Because it is light weight, it may slide. Try bumping the starter while pulling to get engine spnning.

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Dick L

03-22-2012 09:04:09

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 Re: B transmission troubles in reply to willie in mn, 03-22-2012 02:19:21  
You are correct if it is in two gears the wheels are locked up with the clutch in or out. My bad, I didn't read correctly. I can sometimes write readin but sometimes can't read writin.

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jc okla

03-20-2012 19:08:40

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 Re: B transmission troubles in reply to Jon Hineman, 03-20-2012 18:00:07  
that b is so light weight you have to put it in 3rd gear. pull it slow. DAD had one for years.

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