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Allis Chalmers Discussion Forum

WD hydraulic pump rebuild

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09-22-2003 14:14:38

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I have a 1952 WD with plunger type hyd. pump. It lifts good but will not go down. It started this all of the sudden. i am assuming the release valve is sticking, not allowing to releive pressure allowing the rams to go down. I have a manual, but it does not give a very good description. I am mechanically able but do not want to tear into this pump and learn as I go since I do not know th availability of replacement peices or replacement pumps. If any one could give ANY advice or know where I can get parts, instructions, replacement pumps, or someone that would interrested in rebuilding this pump I would greatly appreciate it.

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John Rogers

09-22-2003 19:09:36

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 Re: WD hydraulic pump rebuild in reply to Jeremy, 09-22-2003 14:14:38  
Hi,Jeremy: Try turning the screw located at the front end of the pump into the pump body as this will shift the valve rack to an unload position. This screw is part way down on the pump body between pump and the clutch housing. If that don't work check the linkage to the hold control valve on top of pump. John in Mo.

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09-22-2003 18:46:15

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 Re: WD hydraulic pump rebuild in reply to Jeremy, 09-22-2003 14:14:38  
Do the arms go down when the tractor is not running? I had this problem with my WD and it was in the linkage. I would check that first. If you look underneath the tractor you will see a flat piece with a slot in the upper end. This is the drawbar control rod. Notice the somewhat triangular piece that it connects to. This piece is on a shaft that enter the pump body. On mine where this piece fits on the shaft was loose and allowing the shaft to turn freely and thus the linkage was not turning the shaft in order to lower the lift. This may not be your problem but your description is like my problem especially the all of a sudden part. I hope I have been able to explain this so that you have an idea what to look for and will not have to tear your pump apart. Maybe you can look at the manual while reading this and it will help understand.

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Scott A, MO

09-22-2003 17:59:34

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 Re: WD hydraulic pump rebuild in reply to Jeremy, 09-22-2003 14:14:38  
Jeremy, I have a 49 WD, and just finished going thru my pump. All the o-rings and gaskets were still available at the local AG-Co Dealer. Tear down on a clean bench, and mark how everything came out and where it came out if you don't have picture breakdown from a manual. I used 400 wet and dry sanding paper with WD-40 for lubrication to polish all the valves and some of the bores. It worked like a dream when done. Good luck.

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