Farm Equipment - Hydraulic Pump

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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=141522
Printed Date: 21 Sep 2025 at 5:20pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Hydraulic Pump

Posted By: jcoldman20
Subject: Hydraulic Pump
Date Posted: 16 Aug 2017 at 9:14am

I have an 57 model B that has had a 3 point hook up added to it. When using the hydraulics to lift equipment on the rear or in the middle they bounce up and down like the pump is starving for fluid. The fluid level is full. Has anyone ran into this situation before? If so how did you troubleshoot the problem?

Thanks in advance

Replies:

Posted By: Bill Long
Date Posted: 16 Aug 2017 at 10:59am

First thanks for taking such good are of my favorite.
As to your problem. First, Check the fluid level again. Do be certain it is to the fill plug. You may want to set the tractor on an uphill slant - you should have a gasket dam between the rear end and the PTO - so you want to be sure there is sufficient fluid in the PTO housing. Next you may have air in the hydraulic line. I would suggest you bleed it again. We used to do it by loosening the swivel connection and raising the lift. When the fluid came out full it was clean.
Good Luck!
Bill Long