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

[charlie hill]

Yep some of the things you run into messing with these old tractors are so 
amazingly simple but effective.

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 6:19 PM
Subject: Re: [AT] AC D-14,15,17 Power steering workings?


> Charlie- that's what I said in a much more round about way.  I initially 
> Goggled power steering and everything that came up showed vane type valves 
> that moved proportional to the torque applied on the steering wheel before 
> the steering worm caught up.  In the case of the AC D series system there 
> is no way we are torquing a 0.75" enough to twist anything, so it is the 
> reaction of the worm on the shaft as it applies force to the sector gear 
> that modulates the spool valve.  The spool must self center with hydraulic 
> pressure so even hitting a bump and kicking the worm gear must apply 
> negative feedback to the system.  Clever, these old engineers.
> Carl Gogol
> Manlius, NY
> AC 170D
> (2) AC D-14, AC 914H
> Simplicity 3112 & 7116
> Kubota F-2400
> ----- Original Message ----- 
> From: "charlie hill" <chill8 at cox.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Sunday, January 08, 2006 4:27 PM
> Subject: Re: [AT] AC D-14,15,17 Power steering workings?
>
>
>> 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
>
>
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