Farm Equipment - WD45 hydraulic pump

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WD45 hydraulic pump

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=24764
Printed Date: 24 Feb 2025 at 6:20am
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Topic: WD45 hydraulic pump

Posted By: Denis in MI
Subject: WD45 hydraulic pump
Date Posted: 27 Jan 2011 at 9:47am

Does any body have any ideas on what would cause the pump to be stuck in a constant lift. When I bought the tractor it had a two spool hydrauic valve with one valve running the lift arms and one for remotes. I want to undo this and hook the lift arms up to the pump the factory way and install a high volume belt drive pump that will utilize the spool valves for remotes. The problem is that the factory pump causes the lift arms to rise no matter what position the controls are in and will not let them back down.

Thanks in advance for any help or opinions,

Denis

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1938 B, 1945 B, 1941 IB, 1949 C, 2 1938 WCs, 3 1950 WDs, 1951 WD, 2 1955 WD45, 1957 D-14

Replies:

Posted By: KenBWisc
Date Posted: 27 Jan 2011 at 10:05am

Have you checked to see if the traction booster linkage came loose?

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'34 WC #629, '49 G, '49 B, '49 WD, '62 D-19, '38 All Crop 60 and still hunting!

Posted By: Denis in MI
Date Posted: 27 Jan 2011 at 10:48am

No I haven't I was going to compare it with another tractor but never got around to it I know it was rigged to provide constant flow so I don't know if it is just stuck that way or if it is out of adjustment or other problems,

Thanks,

Denis

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1938 B, 1945 B, 1941 IB, 1949 C, 2 1938 WCs, 3 1950 WDs, 1951 WD, 2 1955 WD45, 1957 D-14

Posted By: skipwelte
Date Posted: 27 Jan 2011 at 11:24am

Either the traction booster linkage is waayy out of adjustment, or most likley the unloadeing valve is stuck in the pumping positon. There is thumbscrew on the front of the hyd pump behind the frame rail, screw that screw all the way into the pump, that will force the unloading valve to the unloaded postion. Do that a few times then unscrew it until the head of the thumbscrew is against the torque tube casting. Most times this works, if it happens again real soon, or still keep pumping, then the pump will have to come off and cleaned up. Sometimes the check ball springs break up, migrate to the unloading valve and cause it to stick. Good luck

Posted By: Matt MN
Date Posted: 27 Jan 2011 at 12:34pm

I would check the linkages, Sounds like the previous owner rigged it up so it is pumping all the time and then they controlled by the hydraulics with the valves. Now that you removed the valves it is still pumping all the time.

below the gas tank, check where the control lever meets the pump.

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Unless your are the lead horse the scenery never changes!!

Posted By: Steve M C/IL
Date Posted: 27 Jan 2011 at 2:25pm

Skip,your mixing terms.The control valves get the pieces stuck in them and the control valves are what the thumb screw pushes on.The unloader is in the other bore.

Posted By: skipwelte
Date Posted: 27 Jan 2011 at 4:14pm

Youre right Steve, the control valves stick and cause the unloder not to unload?? or the control valves stick and the - aw shucks- you know what I mean Steve!!!!!!!!