Farm Equipment - 7000/8000 loader valve

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7000/8000 loader valve

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=54405
Printed Date: 11 Sep 2025 at 7:00am
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Topic: 7000/8000 loader valve

Posted By: acnh210
Subject: 7000/8000 loader valve
Date Posted: 30 Jul 2012 at 8:03am

I have installed a seperate loader valve on an 8050. It is load sensing closed center. I did this verses the open center so the pump wouldn't run all the time and tie up a remote. However when you try to use the factory remotes you have to move the joystick at the same time to get it to work. I simply tee'd off right off the pump with the thought that was closed center so this would work. Obviously I'm wrong. Any help would be appreciated.

Thanks

Replies:

Posted By: Joe(TX)
Date Posted: 01 Aug 2012 at 7:57pm

The new valve has to be a load sensing valve.

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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A

Posted By: D-17_Dave
Date Posted: 01 Aug 2012 at 8:07pm

When you stroke the new installed valve to send the oil to work, your not getting any fluid due to the oil flow is still going through the primary valve. So it's an open center valve right? I'm not familiar with the 7 & 8 series tractors so I'm just guessing.

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Yea, I can fix that.....

Posted By: acnh210
Date Posted: 01 Aug 2012 at 8:17pm

From what I have learned so far. The pilot oil which is always flowing, from the load sense line to the drain line until a lever is pulled, then pressure is the built up as needed. I have it tee'd right now so the oil simply goes through the other valve and pressure is not built up. I understand I need the check valve but can't figure out which one or where to get it.

Posted By: Joe(TX)
Date Posted: 01 Aug 2012 at 9:39pm

Load sensing valves are closed center.

There is no pilot pressure. The main pump is at low pressure until a valve is activated. Pressure the builds and goes to the load sense line and strokes the pump to build pressure. The valves have check valves in the load sense line already.

Like I stated in the other post, the load sense lines for each valve have to be tee'd together. The same goes for the pressure. The added valve has to be a load sensing/closed center valve. Nothing else will work.

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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A