[AT] Farmall 350/300 More Questions

Dudley Rupert drupert at premier1.net
Sun Mar 7 23:34:50 PST 2004


Al,
Thanks for adding your' input to this thread.  You answered a question I've
had ever since I got my MTA.  I noticed when I first drove the tractor that
when using the TA lever to engage/dis-engage the TA that the linkage did not
seem to have any impact on the main clutch so I had wondered what is the
purpose of the linkage.  It hadn't occurred to me until reading your' post
that the linkage is there to work the other way around; that is, to engage
the TA clutch whenever the main clutch is engaged.  After reading your' post
I had to go out and check for myself to see if you were right - you are!
Dudley
Snohomish, Washington


-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of Al Jones
Sent: Sunday, March 07, 2004 6:42 AM
To: 'Antique tractor email discussion group'
Subject: RE: [AT] Farmall 350/300 More Questions


This is a very simplified explanation but maybe it'll make sense: on the
older TA's (560 and earlier) when you pull the lever back, it disengages
the TA clutch--just a smaller clutch on the front of the TA unit itself
and behind the main engine clutch.  This causes the planet gear carriers
to be allowed to rotate and thus give gear reduction.  The one-way
clutch inside the TA, (ramp and rollers) prevent it from "free wheeling"
when power is going through it.  However the design of this ramp and
rollers is why the TA will free-wheel in when the TA is engaged if you
go down a hill.

The TA is designed so that when adjusted right and you press in the
clutch pedal, it actually disengages the main clutch and the TA clutch.
If it didn't disengage the TA clutch, you wouldn't be able to shift
gears, it would want to hang in gear.  Adjusting by the book usually is
the answer here, but if the linkages get any wear on them (as is the
case with my 450) the trick I was told to do was adjust by the book,
then drive tractor up a slight incline and press in clutch just enough
to stop forward motion.  If the TA is adjusted right, the tractor will
sit still on the hill and if you then press clutch all the way in, it
will roll back. If it does not do this, shorten the short linkage
between main and TA clutch until it will roll back.....

Al

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Mike Sloane
Sent: Saturday, March 06, 2004 5:42 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Farmall 350/300 More Questions

Ralph Goff wrote:
> I'm not familiar with the IH/Farmall TA but I always assumed that they
> incorporated a torque converter into the drive train , much like
> Case-o-matic?
No, Ralph, there is no torque converter as far as I know. But I am at a
loss to explain how it engages without the use of the main clutch.



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