[AT] AC D-14,15,17 Power steering workings?

[charlie hill]

Carl,

Mine needs rebuilding but I haven't torn into it yet.   Looking at the 
pictures in the parts book it appears that the spool is actuated by the run 
out in the steering shaft.   When the wheel is turned the worm causes the 
shaft to slide up or down inside the actuator.  That's just a guess but 
that's how it looks.  I think that is the same thing you were saying?

Charlie
----- Original Message ----- 
From: "carl gogol" <cgogol at twcny.rr.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, January 08, 2006 2:16 PM
Subject: [AT] AC D-14,15,17 Power steering workings?


> The first D-14 I bought did not have power steering and since I was 
> expecting to get a front end loader on it someday, I found a used poser 
> steering setup and set it aside about 6 years ago.  Finally 
> "got-round-tuit" this year as  the front main seal leak was not healing 
> itself and the whole front of the tractor has to be removed to do this 
> job.  Rebuilt the assist cylinder and figured the control valve should get 
> new seals and o-rings too. Much to my surprise, when it came apart I did 
> not understand how it worked. It looks a lot more like a standard cylinder 
> control valve then I had imagined.  As far as I can tell, the only thing 
> that actually changes oil flow is a linear displacement of the spool.  The 
> steering shaft passes through the spool, but the spool is trapped  on the 
> steering shaft between two thrust bearings.  The manual's instructions are 
> to tighten the nut that sets the thrust bearings preload load to 60 
> Ft.-Lbs, then back the nut off two flats and stake.  I think that my 
> question is -- Is this limited motion say 0.025" to 0.050" all it takes to 
> assist steering?  Is the resulting reaction of the worm gear against the 
> sector gear enough movement to provide steering?  Does anyone understand 
> this steering system and have some experience with it?  I had one friend 
> tell me that this was called a torque multiplier system and similar to the 
> Char-Lynn add on systems.
> Carl Gogol
> Manlius, NY
> AC 170D
> (2) AC D-14, AC 914H
> Simplicity 3112 & 7116
> Kubota F-2400
>
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