Farm Equipment - WD 45 hydraulic pump help

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WD 45 hydraulic pump help

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=190865
Printed Date: 10 Sep 2025 at 6:31pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: WD 45 hydraulic pump help

Posted By: Chris
Subject: WD 45 hydraulic pump help
Date Posted: 24 Sep 2022 at 4:51pm

I put new seals in pump and holding valve.I have had this thing off 4 times checking to make sure everything is in order and clean.When i start tractor up the pump builds around 3500 psi. The pump does not sound right and it will not let lift arms go back down.I don't know what to do.Any help would be much appreciated!
Thanks,
Chris

Replies:

Posted By: DrAllis
Date Posted: 24 Sep 2022 at 7:30pm

Sounds like the pump is pumping continually. The hold valve doesn't shut the pump off. It only holds a load or lets the load down. Screw "A" must be screwed into the little divot on the side of the pump. Screw "D" needs to be screwed clear "IN" towards the rear of the tractor. Then see what you've got.

Posted By: Chris
Date Posted: 24 Sep 2022 at 8:39pm

Thabk you for helping. I did try what you said, the pump did not sound as bad but lift arms still did not release

Posted By: MACK
Date Posted: 24 Sep 2022 at 8:50pm

Sounds like spool valves are in wrong or one is hanging up. MACK