Farm Equipment - WD hydraulic relief valve

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WD hydraulic relief valve

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=129097
Printed Date: 09 May 2025 at 9:55pm
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Topic: WD hydraulic relief valve

Posted By: pleman
Subject: WD hydraulic relief valve
Date Posted: 22 Sep 2016 at 3:58pm

Bought a 1953 AC WD. The previous owner had low hydraulic fluid so the lift arms worked fine. When I added oil to the correct level and raised the arms, the relief valve did not work and oil spurted from every gasket. How do I check/repair the relief valve?

Replies:

Posted By: MACK
Date Posted: 22 Sep 2016 at 9:42pm

There is no relief valve in WD hydraulic pump, it is a unloading valve. It is shim adjusted. Pump has to be removed and taken apart to be adjusted.

Disassembly pump, clean and polish all spool valves, replace o rings and reassemble. MACK

Posted By: pleman
Date Posted: 23 Sep 2016 at 6:45am

Thanks.

Posted By: Allis dave
Date Posted: 23 Sep 2016 at 6:48am

I agree with Mack. Something must've stuck. I'm not sure what the low oil level would matter unless it was almost out of oil, which would be bad for the pump.

Posted By: DrAllis
Date Posted: 23 Sep 2016 at 10:00am

Before tearing things all apart, check to see exactly what pressure you have.....3400 psi is the max spec.

Posted By: Allis dave
Date Posted: 23 Sep 2016 at 10:18am

Doc has a good point, unless it's leaking so bad now, that you can't use it. By a pressure gauge put a coupler on it to hookup to the hydraulic remote to check pressure.