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Allis Chalmers Discussion Forum
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WD-45 hydraulics

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Bill in IL

02-20-2011 20:15:08




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Hydraulics on my wd will not go up. Happened one day while plowing snow in december so I thought maybe it was ice somewhere in the system. Now that it has been warm I tried it again today. When it started it was working fine raising the blade fully then the next time it would only raise the blade 3 inches or so.

System is full of oil to the recommended level and it will raise the blade 3 inches off the ground in a timely manner.... Then it just stops.

Looking for some ideas as where to start looking. Manual doesn't say much.

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Bill in IL

02-21-2011 08:28:37




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 Re: WD-45 hydraulics in reply to Bill in IL, 02-20-2011 20:15:08  
I know for sure its not an issue with pressure. I brought the tractor up to the shop this morning. While sitting outside idling it allowed the blade to creep upward to the full up position.

What could cause it to stop like that? Is there a way to set raise stops on these tractors?



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Brian G. NY

02-21-2011 13:27:42




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 Re: WD-45 hydraulics in reply to Bill in IL, 02-21-2011 08:28:37  
Follow your linkage down to the control valve on top of the pump.
Check to see that the thumbscrew is turned so that it engages the outer arm (plate) on the control.
There is a hole on the outer plate into which the pointed end of that screw fits which makes the inner plate turn with the outer plate.
Screw happens to loosen occasionally.
Happened to me today when I was moving snow with the bucket on my WD.
Let me know if this solves the problem.

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Bill in IL

02-21-2011 19:02:37




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 Re: WD-45 hydraulics in reply to Brian G. NY, 02-21-2011 13:27:42  
I just ran out to the shop to check it over. linkage is screwed together like it should be. Noticed the linkage was not allowing the valve to completely engage. Worked it down at the valve end of the linkage a couple of times by hand then stared the tractor. Blade raised fully and back down 2x then I got nothing. I noticed that the linkage from the valve to the pump is wore pretty good. Going to have to fix that and go from there. If that don't fix it then I am assuming some internal valve problems.

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