Farm Equipment - 7045 problem

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7045 problem

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=211771
Printed Date: 18 Sep 2026 at 6:58am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7045 problem

Posted By: Jim NEIN
Subject: 7045 problem
Date Posted: 23 Jul 2026 at 2:37am

lost pto and hydraulics still have steering and it moves any help is appreciated thanks

Replies:

Posted By: DrAllis
Date Posted: 23 Jul 2026 at 5:55am

This might be an easy fix. Under the right lift arm on the 3-point hitch is the PTO valve. On the side of the PTO valve is a tee fitting with a hose connected on the front and a JIC cap plug on the rear. Make yourself a 3000 psi gauge to connect to where this cap plug is. With the engine running you should have 500-600 psi and when you pull back on a remote lever you should get 2500 psi. You probably have zero psi. Swing out the battery tray and locate the compensator control valve on the front of the main hydraulic pump. Check the small spring and shims first. I think you have something wrong there.

Posted By: tbran
Date Posted: 23 Jul 2026 at 7:54am

uploads/963/compen_2026-07-23_07-51-50.pdf" rel="nofollow - uploads/963/compen_2026-07-23_07-51-50.pdf

This is a pdf file but this site states it is not a pdf file - so it will not open - grrrr

Item 54-55 are the shims and 56 is the spring to look for

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: Jim NEIN
Date Posted: 25 Jul 2026 at 12:37pm

thank you Dr Allis and Tbran took shims and spring and plunger out couldnt see anything wrong put it back together and everything worked

Posted By: DrAllis
Date Posted: 25 Jul 2026 at 8:22pm

So, you need some new shims because your pressure isn't in that 500-600 psi range.