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Allis Chalmers Discussion Board

Re: WD45 hydro-pump adj. for loader?


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Posted by Bob Bancroft on August 19, 2013 at 18:30:43 from (97.73.64.160):

In Reply to: WD45 hydro-pump adj. for loader? posted by Hossman on August 19, 2013 at 17:48:41:

Without the book or tractor right in front of me, I'm working on memory, which is getting more and more dangerous!
There are three 1/4" NPT ports on the hold control valve. Not all of them "hold". I'm thinking the two directly across from one another are the two that "hold". Usually a loader would be plumbed into one of them, but it's something to check.
The hold control valve should hold independent of pump action- in other words- if you know you have the hold control snapping into the detent position, then with the tractor shut off, it should hold. If it doesn't, you may have trouble with the poppet, ball, or seat in the valve.
I don't think the decal on the battery box goes into the link between the hyd. pump control lever and the hold control. You might have to loosen the 1/4" square head set screw on the hold control and adjust that link. Sorry I can't really tell you how. As I imagine you know, your hand lever will be somewhere in mid travel when you're in hold position. But what's important is that the pump is not pumping when the hold control is in hold, because it will just keep right on lifting.
I imagine it's VERY rare- but I had one that no matter what we did, we couldn't get it. Finally I tore it apart and compared the hold control valve to a working one. Sure enough- when the camshaft was pressed into the lever, it was indexed wrong. Pressed it apart, turned it a little, pressed it back together, and it worked. This was a 30 year old tractor, with a loader installation showing up the problem for the first time!


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