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Allis Chalmers Discussion Forum

WD45 hydrolic pump leak??

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04-05-2011 19:27:15

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Guys, I have a persistant oil drip on my hydrolic pump on one of my wd45's. The leak is a very slow but persistant drip and it is coming out of the large adj. screw located on the top of the pump,its one of the "hold" adj. screws, the one that runs horizontil on the very top. It is the screw labled "A" on the batt. box diagrams or in the manuels. It also has the fairly large knurled knob on it,and if you back it all the way out it goes up against the little pointed stop that is screwed vertical into top of pump.The leak is seeping out around the threads of the adj. screw. I was wondering if there was an "O" ring type seal inside or what is letting the oil seep out. Sorry for the long post but wanted to explain the proper screw. Thanks for any help, Hoss

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04-06-2011 19:06:00

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 Re: WD45 hydrolic pump leak?? in reply to Hossman, 04-05-2011 19:27:15  
Fellas, thanks for the help an advice, sounds like a fairly straight forward fix.Thanks again, Hoss

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04-06-2011 04:44:31

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 Re: WD45 hydrolic pump leak?? in reply to Hossman, 04-05-2011 19:27:15  
My manual is showing a shim(looks like a washer to me) then a seal. I can't tell if it is an o-ring or what. I seem to remember it being an 0-ring. next is a spring a valve ball a valve seat and a plunger. The seal should fix it. I mentioned the other parts so be on the look out if they should come out. Possibility the spring may want to come out with the screw.

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Bob Bancroft

04-06-2011 04:31:06

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 Re: WD45 hydrolic pump leak?? in reply to Hossman, 04-05-2011 19:27:15  
I don't say anything for sure without looking it up as my experience and memory are both aged. But, congratulations- you have an easy fix. The hold control valve is fastened to the pump with two 5/16" capscrews. There is an o-ring at that joint. You also might be able to remove your leaking knob by unscrewing the hex/pointed cap you mention. There's a copper washer under that, and spring, ball, etc. And, yes I believe there's an o-ring on that knob. You can go to Agco parts online, check in as a guest user, and dig through to find your model, correct page, etc. Then you'll have a picture of what you're doing as well as part numbers.

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