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

[Gene Dotson]

    Carl;
    On my Case 700 has a similar setup, but it is in the front
pedestal. The maximum setting on it is .042 total end play. Any
more than that and the front end will shimmy. That setting
sounds about right for the D series.

                Gene




----- 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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