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Allis Chalmers Discussion Forum
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WD Hyds

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firedog

07-27-2003 18:32:33




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I just bought a nice WD wide-front that has been upgraded with a 45 block, snap-coupler, and after-market 3PT hitch. It had been outside for the last year. The fluids and plugs were checked and changed with the carb getting a re-build.It now runs great.
I hooked the tractor to the 3pt mower and have had difficulty getting the hyds to "Hold Position". I ran for about 2 hrs. and trying to adjust on the go. No luck as the lever in the middle position still builds pressure in the lift mode and gradually lifts the mower all the way up. When the implement has been lowered completely and the lever moved back to the detent or middle position, the implement will stay down. As soon as I attempt to lift several inches and hold position,the arms want to lift. I have the pump set to Hold Position according to directions in the owners manual. My question : Do you think the valve in the pump is just sticking and needs more use or Should I be thinking about a pump/valve re-build ? Is there anything else that I should do or check?
Thanks,
firedog

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Dave Grubb

07-29-2003 08:50:11




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 Re: WD Hyds in reply to firedog, 07-27-2003 18:32:33  
The first thing to check is to see if when you lift the implement and shut the tractor off with the hand lever in the raise position does the implement stay up the rest of the day? If it creeps down the hold valve is leaking internally and must be fixed before the system will operate correctly. The manual states that screw 'C' should be turned in about midtravel. This puts more spring pressure on the hold valve in the closed position.

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firedog

07-29-2003 19:18:14




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 Re: Re: WD Hyds in reply to Dave Grubb, 07-29-2003 08:50:11  
Thanks,Dave, for the reply.
The tractor holds the mower up very well. what I have done is to put several several Hydraulic lift stops on both cylinders to hold a set height when I drop the mower all the way down. I then return the lever back to middle position (detent), and it no longer wants to build pressure. Tryed it out tonite and is working fine.
firedog



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