[AT] Transmission/Differential Fluid

Fri Apr 16 07:33:56 PDT 2004

hydrolic oil is made more to apply force not lubricate messing gears and in
the pin hole size orfice there isn't much room for air to mix with the oil
and you usally bleed the air out of the hydrolic system , but in an open
area like the trans and rearends with lots of air area I think foaming could
be a problem.

Don

----- Original Message -----
From: "charlie hill" <chill8 at cox.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Friday, April 16, 2004 6:47 AM
Subject: Re: [AT] Transmission/Differential Fluid

> Grant I'll take that a bit further.  The "weight" of the oil, or
viscosity,
> is a measure of it's resistance to shearing force.  Shearing force is
> exactly what the oil sees when it is trapped between two gear teeth.
> 20W just ain't gonna get the job done when the specs call for 85W-140.  It
> would be kind of like substituting light weight worsted wool for leather
in
> your motor cycle pants.
>
> With regard to life of the oil, foaming and other issues,  I can't think
of
> a tougher job for oil than hydraulic pumps or automatic transmissions.  If
> being forced through a pin hole sized opening at up to 3000 psi and 300
Deg
> F won't make you foam and burn I don't know what will.
>
> Charlie
> ----- Original Message -----
> From: "Grant Brians" <gbrians at hollinet.com>
> To: "Antique tractor email discussion group"
<at at lists.antique-tractor.com>
> Sent: Friday, April 16, 2004 12:11 AM
> Subject: Re: [AT] Transmission/Differential Fluid
>
>
> > The old transmission fluid still works great for any applications that
are
> > not Hy-Tran fluid ones. I bought a 55 gallon drum of 85W-140 a few years
> ago
> > and it was under $4 a gallon. Now it is probably over, but it is
> definitely
> > an item that moves slowly (yes, pun intended!) In any case I would
> > definitely NOT use ATF in any application that was specified as gear oil
> > originally. The reason is simple. The 85W-140 lasts essentially
> indefinitely
> > without breakdown. The 20W ATF is designed for relatively frequent
> changes.
> > Think about a car or truck that has an Automatic Transmission. It will
> have
> > the fluid changed at 50,000 miles typically. That is equivalent to
> probably
> > 600-700 hours on a tractor.
> >     While many antiques are no longer really worked, when I take our
> Olivers
> > out, they are subjected to severe service and I would not want to take a
> > chance. Second, we all eventually have some condensation in the cases of
> > these tractors. The water WILL NOT mix with the heavy gear oil at all,
> while
> > it might get foamed up in the light weigh oil. In short, why use the
> lighter
> > oil where the parts were designed for heavy oil.... On the other hand if
> you
> > have a "modern" hydraulic/transmission system, then you will be using
> hytran
> > and changing it frequently no matter what!
> >         Grant Brians
> >         Hollister California
> > ----- Original Message -----
> > From: "Dean VP" <deanvp at att.net>
> > To: "'Antique tractor email discussion group'"
> > <at at lists.antique-tractor.com>
> > Sent: Thursday, April 15, 2004 6:23 PM
> > Subject: RE: [AT] Transmission/Differential Fluid
> >
> >
> > > Dudley:
> > >
> > > I don't remember the thread about using transmission fluid in place of
> > 80-90
> > > weight Gear lube.  But since I have to use so much of the 80-90W stuff
> for
> > > the large cavities in the old JD's I have searched around a bit to
find
> > some
> > > reasonable priced stuff. The JD and Napa 80-90W oil is just too
> expensive
> > > for the quantities I needed.
> > >
> > > A few years ago I found 80-90W Gear Oil at the Costco in Yakima, WA in
5
> > > gallon containers. I immediately bought several containers. I don't
> think
> > > they sell it as 5 gallons however, I think it's by weight. Some odd
> > measure.
> > > I hadn't seen it at our local Costco's in Everett or Kirkland but I
have
> > > since discovered it at the Mount Vernon, WA Costco which is one heck
of
> a
> > > lot closer than Yakima. As I recall the container sells for $23 to
$27.
> I
> > > just don't remember the exact price now. That is less than half the
> price
> > of
> > > JD's version. I suspect I/H dealers have a similar high price.
> > >
> > > I know this doesn't answer all of your questions but it is the most
> > > reasonably priced bulk 80-90W oil I have found locally. I have it in
all
> > my
> > > tractors w/o any problems so far.  $5 a gallon is sure better than $12
a
> > > gallon. I suppose if one bought it in a 50 gallon barrel one could do
> even
> > > better but I wasn't willing or ready to deal with those issues.
> > >
> > > Dean A. Van Peursem
> > > Snohomish, WA 98290
> > >
> > > CRS = Having a Photographic Memory but a shortage of unused film.
> > >
> > > www.deerelegacy.com
> > >
> > > http://members.cox.net/classicweb/email.htm
> > >
> > >
> > > -----Original Message-----
> > > From: at-bounces at lists.antique-tractor.com
> > > [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dudley
Rupert
> > > Sent: Thursday, April 15, 2004 5:19 PM
> > > To: Antique tractor email discussion group
> > > Subject: [AT] Transmission/Differential Fluid
> > >
> > > I seem to recall - it has probably been a couple of years ago now - a
> > thread
> > > on transmission fluid versus gear lube in the
transmission/differential
> of
> > > older tractors.  While I know the manuals generally call for 80-90 wt
> gear
> > > lube I seem to recall that some/several on the list indicated that
they
> > were
> > > using automatic transmission fluid instead.  A couple of weeks ago I
> > drained
> > > the back end of a Farmall M - it definitely had thin, red looking
fluid
> in
> > > it.  I am now ready to refill and am thinking of using transmission
> fluid
> > > instead of gear lube.  While I have drained six or seven tractors
before
> I
> > > have never yet refilled with transmission fluid.  So, I am curious -
the
> > > last time any of you refilled the back end of an old tractor (I have a
> > T035
> > > so know Ferguson's need a special/unique oil), did you use
transmission
> > > fluid (and if so what kind) or did you use gear lube?  I don't recall
> but
> > > does anyone remember any drawbacks being noted from using transmission
> > > fluid?
> > >
> > > Thanks -
> > > Dudley
> > > Snohomish, Washington
> > >
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