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Old 05-09-2017, 10:43 PM
JBFab JBFab is offline
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Default Draft controlled 3 point conversion to position control

I have a '51 Ferguson TO 20. It's one of the first production models that uses a 3 point mechanism. Back then​ it was called "The Ferguson System". I don't fully understand how it works, but my rudimentary understanding is that the hydraulic circuit received feedback from the linkage via the top link. This was intended to be used with ground engaging equipment like plows. If the drag on the implement increases, the feedback tells the quadrant to lift it out of the ground a bit and vice versa.

Now most anything I ever intend to use is not ground engaging. I want position control. Some smart fella by the name of Zane sells his Zane Thang to convert said tractor to position controlled 3 point.

Does anyone have any experience with this? Couldn't a guy simply hook the top link to a solid mounting point? Is there some sorta magic in his contraption?

Simple minds need help - what do you know about this?
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Old 05-09-2017, 11:17 PM
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You are correct about the operation of the draft control.

If it were me I'd have to try it out a bit and see if the load control was not manageable. A post hole digger is about the only implement that springs to mind where depth control would be an issue, maybe.

A google'ing of the Zane thing turns up a linkage that runs from the lift arms and hooks to the three point lever to counter act movement. Seems like to me it would be better to pin, bolt or wedge the top link mechanism so the draft control never receives its signal.
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Old 05-10-2017, 03:05 AM
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I had a Ford way back when with Draft Control. It had three different sets of holes on the vertical to mount the upper link at the rear of the tractor. The highest holes for light equip, the lowest for the heaviest from what I remember reading the owners manual.

Using my posthole digger I had the diggers rear arm mounted in the lowest hole. This tractor also had the ability to use or not use draft control. But, it worked well either way.

Thinking on it, I don't think I ever used the upper holes as I never considered anything hanging off the back as 'light'.
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Old 05-10-2017, 04:30 AM
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do some more googling, and join the greyfergie forum.

There's a set of drawings out there to make your own position control.

Seemingly they do work. I have a TEF myself and I just about understand how the factory setup works having had to do a share of work to it when I first got the tractor, but I could never get my head around the position control mod, but essentially it feathers the lift lever to hold against a given load at a given point. something you can do yourself while stationary but when you move and the load sways it's more difficult.


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Last edited by JohnBoy; 05-10-2017 at 04:43 AM.
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Old 05-10-2017, 05:55 AM
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I know Ford and Ferguson did a bunch together. I recently acquired a '48 or "49 8N. Under the seat on the right side is a lever. up is draft, down is position. I do not know if the Ferguson had that lever but since yours is newer....

Good luck..

Jeff
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Old 05-10-2017, 07:53 AM
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Haven't had much to do with Fergies or 8N/9Ns for many years but back when I was a kid I put lots of hours on several of them while cutting and raking hay. I don't recall having an issue with the lift mechanisms of any of them. Could be they all had the lockout lever but I don't remember seeing or using one.

Have you tried using the tractor as is? Do you have problems? Or are you just anticipating them?
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Old 05-10-2017, 08:19 AM
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Interesting fact:

Link below is the Nebraska tractor test.

http://digitalcommons.unl.edu/cgi/vi...actormuseumlit

Note that the octane of the gasoline was 74. Which was probably fine for 6:1 compression.

Also, I noted the 8N - ness of the pics. Very similar.
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Last edited by JH35; 05-10-2017 at 08:20 AM. Reason: added info
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Old 05-10-2017, 08:53 AM
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http://fergusontractors.org/fena/wp-...-for-20-30.pdf
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Old 05-10-2017, 09:02 AM
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My Allis WD has it but I never fucked with it. This thread is of interest to me.
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Old 05-10-2017, 09:33 AM
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My Massey is mid 70s and has a draft control lever as well as a fixed control lever. Never used the draft control as I do not farm. Not much help.
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