8030 low hydraulic flow
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=208354
Printed Date: 02 Oct 2025 at 4:03pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8030 low hydraulic flow
Posted By: Josh(NE)
Subject: 8030 low hydraulic flow
Date Posted: 29 Sep 2025 at 5:51pm
I bought a stack mover that the bed chains are driven hydraulic. Hooked it up to my 8030 and the chains ran super slow. Had local mechanic flow test my remotes and it's only doing 3 gpm at any pressure up to 2600 psi. I put a 3000 psi gauge on at the pto valve tee, and I am getting idle circuit pressure of 410 psi, if I activate a remote that has nothing connected the idle circuit pressure jumps to 2600. Talked to local dealership service manager and he suggested looping each box to make it flow without restriction, and toggle the remotes to try and unstick the valve that runs the swash plate. After doing so local mechanic put flow meter back on and when I opened a valve it maxed his meter out at 20 gpm, the instant he started to restrict the flow to test pressure it went back to 3 gpm. We tried all previous things and can not get more than 3 gpm at any box now. What's wrong with this thing?
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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Replies:
Posted By: DrAllis
Date Posted: 29 Sep 2025 at 6:30pm
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It sounds like a piston pump issue. I'm thinking the rotating barrel must be lifting off the end housing when enough pressure is made. When I was younger I'd have a pump like that off the tractor and scattered on the bench in no more than one hours time. That's what I'd be doing if it was mine. Once the pump is removed, but NOT disassembled, see how difficult it is to turn the shaft. It should turn hard enough to require a pair of pliers to rotate it. If it turns easy, it's what I suspect. Something wrong with the coil spring pressure system or a badly worn barrel and end plate.
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Posted By: 8070nc
Date Posted: 29 Sep 2025 at 7:25pm
Flow control could be turned down
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Posted By: DrAllis
Date Posted: 29 Sep 2025 at 9:12pm
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Well, I would hope the flow controls for each valve were tried. Both of them would have to be on the slowest setting, not one. And how could the flow go from 2 to 20 GPM ??
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Posted By: Josh(NE)
Date Posted: 29 Sep 2025 at 10:27pm
Flow controls have been tried in various positions
Currently, they are pointing to the left as viewed from under the seat. If turned straight up, or to the right flow also does decrease.
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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Posted By: Josh(NE)
Date Posted: 29 Sep 2025 at 10:29pm
Any chance the issue is caused by the priority valve?
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Allis Express
'65 190XT, 37 B, '72 170, '83 8030, and the IH 560 was a mistake
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Posted By: DrAllis
Date Posted: 29 Sep 2025 at 11:05pm
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I've thought about that, but have never had a 7000 or 8000 tractor ever bother in that particular area. If it's easy to remove on the valve (without removing the valve stack) I probably would, to verify no sticking spool or a broken spring. If I was standing next to the tractor while running I might hear something that would point me to the pump that you can't hear. I had a 7060 some 40 years ago that did a similar thing and the pump lost its squeeze on the rotating group. When or how many hours ago did the remotes actually work correctly ?? You haven't changed the belly filters just recently ?? and are they AGCO filters ? (they need to be) and if the right hand filter is installed backwards, the piston pump will do really weird things. I had one customer do that one time and only one time have I seen that.
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