Model B Hydraulic Pump
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=50335
Printed Date: 23 Aug 2025 at 3:30am
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Topic: Model B Hydraulic Pump
Posted By: Daniel
Subject: Model B Hydraulic Pump
Date Posted: 09 May 2012 at 11:28pm
Just got the B back up and running again, changed the trans fluid after I
got it running with 303, I'm having trouble with the hydraulic pump
holding the plow up, it wants to release the hydraulic cylinder, it
wants to hold it up part of the time and when it doesn't pushing the
lever down and releasing pressure for about 3-4 seconds then raising it
back up will cause it to hold. Any ideas on how to fix this?
This is the original pump on my '39 B.
Daniel
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Replies:
Posted By: SteveC(NS)
Date Posted: 11 May 2012 at 5:49pm
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Daniel I can`t help but your post needs a bump.
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Posted By: wfmurray
Date Posted: 11 May 2012 at 7:48pm
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Had a similar problem on my 49 B. Take pump off and flush with a good solvent, if that don,t work remove bypass valve and have seat recut and reinstall with barrel down 9/16 in in hole . My seat was boggered up and machinest took .010 thousand off it and now it works great , will hold plows up for days.
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Posted By: CTuckerNWIL
Date Posted: 11 May 2012 at 8:06pm
Any one of the check valves could be leaking. If you take it apart and find any pits in the small balls for the check valves, you can buy replacement bearing balls the same size. You get twice as many as you need and use the first one in each position to smack with a punch and hammer to reform the seat. Then throw that ball away and put a new one in and replace the spring. It doesn't take much to reform the ball seat, but if it has been leaking it should be done.
The pump is pretty simple, just get a drawing of it from a manual, and make sure you have a clean work surface with room to lay an old towel down under so you can catch any parts that want to roll or bounce away.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: Dean (West MI)
Date Posted: 11 May 2012 at 9:35pm
Posted By: Daniel
Date Posted: 18 May 2012 at 10:30pm
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Thank you SO much guys, I will do as suggested! Sunday I plan to work on it!
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