Allis 7000
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=188992
Printed Date: 23 Aug 2025 at 12:38pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis 7000
Posted By: WranglerSteve
Subject: Allis 7000
Date Posted: 19 Jun 2022 at 9:27pm
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I bought a Allis 7000 Black Belly. I have a maroon one and get along ok with it. Anyways, owner lost hydraulics one day, had the hydraulic pump rebuilt and it worked for a day or so and lost hydraulics. Clean fluid no metal and new hydraulic filter. I found if I tie a remote (doesn’t matter which one) I have steering, Transmission, power shift and brakes. When I push PTO lever forward it doesn’t engage and the lever will not stay forward. Assuming there is not hydraulic fluid in the valve body for it. Any help would be greatly appreciated. Thanks
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Replies:
Posted By: MACK
Date Posted: 20 Jun 2022 at 7:28am
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Sounds like you may have a hole in a section of the pump allowing oil from one section to bypass to remote section. MACK
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Posted By: WranglerSteve
Date Posted: 20 Jun 2022 at 8:42am
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I found that if I have the 3pt remote tied back everything works. PTO works but I haven’t put it on a swather or anything yet. Still most likely a pump issue? I had good stream of fluid come from each line on the pump.
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Posted By: Hurst
Date Posted: 21 Jun 2022 at 12:12pm
I'd have to look at a manual, but I think it has a 2 section pump, 1 section is the traction booster (very small output) and the other is the trans/steering/hydraulics. It was controlled by the priority valve that would give priority to the trans/steering cricuit first, then the hydraulics. I don't have my manual in front of me, but I want to think it is the spool behind the biggest hex plugs on the pump. Maybe someone can verify for me. If not, I can try to scan the pages of the service manual to you. I'm thinking the priority valve is stuck open to the remote hydraulic port. When you activate a remote, you are dead-heading against the relief valve, which allows fluid to bypass into the transmission/steering section. This is all speculation without seeing my manual and the flow diagram through that pump. Do you have decent remote function at lower RPMs? If the priority valve is working, usually a 7000 won't put out much flow or pressure from the remotes until you get around 13-1500 rpms.
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1979 Allis Chalmers 7000
5800 Hours
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Posted By: WranglerSteve
Date Posted: 25 Jun 2022 at 8:42am
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I have not checked pressure at the outlets
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Posted By: WranglerSteve
Date Posted: 25 Jun 2022 at 4:15pm
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Would I be able to switch spools out to test? Do you have a operators manual or a parts manual? I’m about to order one now that I’m back at my computer
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