Series 3 flexhead question
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=209500
Printed Date: 28 Dec 2025 at 11:42am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Series 3 flexhead question
Posted By: 67-d10
Subject: Series 3 flexhead question
Date Posted: 27 Dec 2025 at 12:41pm
Working on adapting a 313 flexhead to a K2. Got the head mounted and good to go with that side of things.
My question is, what voltage is seen at the header height 3 spring system on the head?
I think my plan is to build a system from the ground up for it, utilizing what is currently on the head. So, I want to verify what voltage the head itself is made for. I am not going to make it for low, medium and high. Probably just the medium setting.
So I’m not going to use a header height module from a different combine, which is why I don’t know if they run a lower voltage through the header side of things.
Any thoughts would be appreciated.
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Replies:
Posted By: DrAllis
Date Posted: 27 Dec 2025 at 3:20pm
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I've never measured the voltage at the three springs, but was always told is is less than 12 volts to eliminate any spark and the springs and the brass bars last far longer as a lesser voltage.
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Posted By: 67-d10
Date Posted: 27 Dec 2025 at 4:05pm
That’s what I was suspecting. I figured it would be a long shot for anyone to know, but it’s free to ask as well.
I can run a lower voltage to operate the relay, just was trying to verify before I screw up parts on the head, or start a field on fire!
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Posted By: tbran
Date Posted: 27 Dec 2025 at 5:16pm
The low med high is no issue - just a swtich. If you make one work you can make them all work with a simple 3 position switch. I would be interested in how you plan to build the electric over hyd system. The heavy 313 without an accumulator will necessitate tieing the final drives together as in a 4 row corn head. Also you are correct to have the auto header working - failure to use this will always result in failing the pivot shaft area - it does on the F3's long term as one will always end up with too much side torque on the header ends as one cannot react fast enough running it manually as it drags the ground.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: 67-d10
Date Posted: 27 Dec 2025 at 6:48pm
Correct me if I’m wrong, but looking at the current hydraulic system on the K2 with the robot style header height, it appears that with the hydraulic stick in the lower (detented position) the oil continually flows through the header height (robot) control valve on the side of the cab. When the robot calls for it to raise, the flow through the valve is closed (stopped), forcing the oil to raise the header. When it calls to go back down, it allows the oil to flow back to the “tank.”
If this all checks out, my plan is to replace the current mechanical robot valve with a electric solenoid valve that would also shut off flow when it calls for raising, and allows flow when it calls to lower.
Same idea, just operating with wires rather than cable from the head. I would still rely on the factory raise/lower mechanical valve for operating at the end of the field.
Maybe my master plan won’t work either?
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