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Electric power steering for my 8N

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JF in MI
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PostPosted: Mon Jan 13, 2020 1:26 pm    Post subject: Electric power steering for my 8N Reply to specific post Reply with quote

This is a 2009 Toyota Prius power steering unit and module I adapted onto my 8N. The pictures show the Ford column tube cut off at the box and the inside of where the tube was machined out to fit a CR 8060 seal at this new location. After the Ford column shaft was cut off, leaving about an inch exposed, I welded up an adapter made from a piece of tube, to fit over the old shaft, welded to the end of a cut Toyota U joint connector from the Prius lower column extension.
Part of the 8N body support work had to be cut away to clear the power unit and I also had to heat up and pound out (rather than just cutting away) some of the instrument sheet metal to also clear the unit. The throttle linkage also had to be relocated about an extra inch to the right to clear. I welded up an adapter to bolt the power unit (using the Koyo mounting surface bolt holes) to the 8N body support that is normally bolted to the 8N steering box.
The final "challenge", as it were, was to figure out a way to attach an antique American steering wheel onto a Japanese column. The middle section of the Koyo column, where I had to shorten it to, has a serrated shaft of similar diameter to the Ford shaft albeit a much more coarse serration compared to the old Ford shaft. The wheel would not slide over the new column. I had to cut a section off the Koyo shaft to shorten the overall column so it would be the same height as the old one. I started thinking about the piece I removed and sharpened one end then used it as a broach tool by sticking it in the hydraulic press and forcing it through the steering wheel hub. It cut a new pattern into the old wheel. All I then had to do was tap the center hole in the column shaft to 7/16" threads to bolt the wheel on. Worked like a charm.

















 
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Ultradog MN
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PostPosted: Mon Jan 13, 2020 4:09 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

Some random thoughts:
*I believe you will prematurely wear out your steering box with that unit.
*I personally see no reason to reinvent the wheel. Not when Ford built a power assist steering system just a few years later and installed it on a tractor that already had way more features than an N.
*My bet is that when that tractor gets sold (and they all get sold, eventually) that unit grafted on there will knock at least 1/3 off the value of the tractor.
*It's your tractor to do with as you choose.
 
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TheOldHokie
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PostPosted: Mon Jan 13, 2020 4:47 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote


Thanks for sharing and nice job of grafting it in - some clever metal work. The others that have gone this route report it works really well with no problems to date and they love it. It's a major modification and not for the faint of heart but traditional PS has been a really expensive upgrade and with the low cost and steering improvement you get with these EPS units I expect to see more and more of them coming down the line ;-)

TOH
 
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Tracy Brown
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PostPosted: Mon Jan 13, 2020 5:20 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

I like it. I have an 800 series I'm putting back together and thinking about doing something like this.
 
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Hobo,NC
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PostPosted: Mon Jan 13, 2020 5:24 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote


Nice job Njoy the EPS...
 
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JF in MI
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PostPosted: Mon Jan 13, 2020 6:34 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote


Points taken. I don't quite understand the 'premature wear' thing. Example; if you're making sharp turns between trees your choices are a: turn the wheel harder to avoid the tree or b: hit the tree. The load on the box is the same (to miss the tree) just the input effort is not. Arthritis being what it is, I'm more concerned about wearing out my shoulders.
Unfortunately this is the tractor I have, not one with an already 'invented wheel'. For a total outlay of $150 whatever this tractor can't do I'll use one of my others.
You may be right on a loss of value at sale however I'll be dead by then and scientific studies have indicated that most dead people don't care that much about monetary gain or loss.
 
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Hobo,NC
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PostPosted: Mon Jan 13, 2020 7:16 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote


Makes you wonder if a power nailer weakens the nail..
 
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TheOldHokie
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PostPosted: Mon Jan 13, 2020 7:40 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

CVPost-JF in MI wrote:
(quoted from post at 22:34:32 01/13/20)
The load on the box is the same (to miss the tree) just the input effort is less.


Exactly :idea:

TOH
 
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Royse
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PostPosted: Mon Jan 13, 2020 8:32 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

Nice work! Now you could put that loader back on it. LOL
 
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JMOR
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PostPosted: Mon Jan 13, 2020 8:49 pm    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

Royse wrote:
(quoted from post at 00:32:59 01/14/20) Nice work! Now you could put that loader back on it. LOL
Very impressive work!!!
 
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Ultradog MN
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PostPosted: Tue Jan 14, 2020 1:09 am    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

Poor analogy Hobo. Nail don't care.
Putting 150 psi to your air nailer is
more like it. Wears it out.
They like to run about 90 psi max.
 
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Ultradog MN
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PostPosted: Tue Jan 14, 2020 2:05 am    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

"don't quite understand the 'premature wear' thing."

Ford never put the power assist Behind the sector gears. Only in front of them. There is a reason for that.

"You may be right on a loss of value at sale however I'll be dead by then and scientific studies have indicated that most dead people don't care that much about monetary gain or loss."

I do hope both you and your PS last a long time. And in the end, Ns are cheap anyway so 1/3 of not much is well, not much.
 
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TheOldHokie
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PostPosted: Tue Jan 14, 2020 3:09 am    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

CVPost-Ultradog MN wrote:
(quoted from post at 05:09:43 01/14/20) Poor analogy Hobo. Nail don't care.
Putting 150 psi to your air nailer is
more like it. Wears it out.
They like to run about 90 psi max.
]

An absolutely horrible analogy that continues to misstate the physics that everyone else has by now grasped:

The power (torque) input to the gearbox to turn the road wheels is the same with EPS as it is without it.

TOH
 
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Ultradog MN
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PostPosted: Tue Jan 14, 2020 4:41 am    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

As you wish.
Inputting more torque or pressure than a
machine is designed for is not a
prescription for longevity.
As for the topic at hand - inputing the
power assist behind the sector gears - I
shall continue to advise against doing
it and you will probably continue to say
it is a great idea.
And never the twain shall meet.
 
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JF in MI
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PostPosted: Tue Jan 14, 2020 5:39 am    Post subject: Re: Electric power steering for my 8N Reply to specific post Reply with quote

That belongs to you now.
 
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