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Allis Chalmers Discussion Forum

Allis Chalmers CA oil pump beveled fins

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10-05-2007 20:01:28

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I have an IT service manuel that says the bevels on the fins in the oil pump is supposed to be installed in the direction of travel and facing anti-clockwise from the drive end. So I turned engine with the hand crank, found the direction of travel and I installed it according to what the WORDS in the book said BUT there is a picture in the book that looks like they go the other way(its small and hard to tell but looks that way). Then I got no oil pressure. Then I found out I had a craked oik tube and THAT was the problem but not before I split the tractor and reversed the fins so the bevels appeared as in the picture. I primed it and now it seems to pumps oil, but do I have the fins backwards? And what if I do, is it that important anyway?

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10-06-2007 20:54:51

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 Re: Allis Chalmers CA oil pump beveled fins in reply to jdneal, 10-05-2007 20:01:28  
apparently it dont make any difference? when you are looking at the pump on the open end, it turns clockwise. i always put the bevel on the leading side so the slope part contacts the pressurized oil. I though thats what is said in the B service manual also? The IT book as i remember is confusing as the picture seems to be opposite of what it says. I always thought the picture was wrong. Plus they describe the pump from the driven end, and you are installing the fins from the other side (backward) so its confusing. I beleive the B manual has a better drawing.

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Dick L

10-06-2007 05:47:23

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 Re: Allis Chalmers CA oil pump beveled fins in reply to jdneal, 10-05-2007 20:01:28  
I don't know why the I T would state it that way. I have always assembled the pumps with the bevel to back. That is how any I have taken apart was assembled.

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