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Allis Chalmers Discussion Forum

Rebuilding the hold position valve on a WD45

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04-07-2004 17:07:27

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Does anyone have instructions for rebuilding the hold position valve on a WD45? I've already tried resetting the adjustments per instructions I found in this forum and also tried to reseat the check valve using a drift and hammer but I still can't get the lift arms to stay in position without the pump running (they drop like a rock!). I'm guessing the check valve seat is bad and needs to be replaced. Where can I get parts?


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David_T (MO)

04-08-2004 19:47:23

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 Re: Rebuilding the hold position valve on a WD45 in reply to Jack, 04-07-2004 17:07:27  
I've got an exploded scan of the manual if you'd drop me your e-mail.

Another thing to check, especially if you've tried to reseat the ball. The hold position valve has a rod that rides on a cam. As the cam turns, the rod lifts the ball off the seat allowing the rams to drop. When the cam returns to the original position the rod should allow the ball to return to its seat. If the seat has worn or the ball been re-seated (you really need to pull the rod out to do this), the rod may be too long to allow the ball to seat. Its trial and error, grind a little off the rod, put her back together and see if she holds. If not, grind a little more off the rod. You'll know when you've gone too far when she holds but won't drop (rod too short to raise the ball off the seat). :-)

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04-09-2004 07:57:46

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 Re: Re: Rebuilding the hold position valve on a WD in reply to David_T (MO), 04-08-2004 19:47:23  
I have a manual & expoded view but thanks for the offer. Your solution sure sounds like it'll fix my problem. There is one very small "sweet spot" on the quadrant where I can get it to hold position, and that's probably exactly at the low point of the cam. I'll bet shortening that rod a tad will do the trick. Many thanks!


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04-08-2004 19:19:18

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 Re: Rebuilding the hold position valve on a WD45 in reply to Jack, 04-07-2004 17:07:27  
You need a reprint of the AC repair manual for this tractor. It will take you through the whole hydraulic system and how to set it up. And tell you a lot more about your tractor too. Well worth the money.

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