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Allis Chalmers Discussion Forum
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Merry Christmas Denny

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Dick L

12-24-2006 13:01:46




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When you find a gear pump in any of the B"s, C,s, CA"s or any of the D-12"s thru the D-15"s please send me a picture.

I have the D series pumps in the B and C that I pressured the rod bearings by drilling the crankshaft. Even though they are a higher volume (vane) pump they have the same mounting bolt pattern as in the drawing below.




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Texas Denny

12-24-2006 13:54:12




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 Re: Merry Christmas Denny in reply to Dick L, 12-24-2006 13:01:46  
Dick, you are correct. It is a vane pump. I suppose the vanes could be worn out. But wouldn't it have trouble with staying primes if that were the case? Th B and C do have a priming problem if they are allowed to dry out -- setting a long time or occasionally on a rebuild.



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Dick L

12-24-2006 14:25:10




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 Not Necessarily in reply to Texas Denny, 12-24-2006 13:54:12  
If the pump is wore into the cover some it will not suck air into the system to allow the oil to drain back down into the pan. It will spin without pushing all the oil thru the pump. I have seen the same thing happen when some have rebuilt or at least re gasketed the pump and put the thick gasket under the cover rather than the thin one. I have no idea the exact problem with this tractors oil pressure but the pump would be a place to start after the engine is unbolted from the torque tube. If it is not the pump it will still have to be removed before the cam is pulled out to check the cam bearings. What ever is decided it will not be good to continue to run it with out oil pressure.

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