[AT] MF-35 Hydraulic Selector Valve

[Grant Brians]

Interestingly enough we have been working on an MF390T (larger, newer
version of the same Massey Ferguson design) on the hydraulics. Echoing the
statement below, the o-rings are almost certainly failing. But, we have had
4 failures on ours and are thinking there may be another part of the design
causing these failures. Don't hesitate to take the valve off and check all
components. If it is the o-rings, your local industrial supply should be
able to supply the high pressure spec o-rings for you. The gaskets on the
other hand would have to be ordered or make your own.
     On the subject of gasket making, a few years ago I came across a little
kit that I did not know what it was for - it had a bunch of what looked like
hollow pins in it. Lo and behold it is a gasket punch kit and it makes the
niftiest round holes in gasket material, paper, etc. and allows us to make a
gasket so fast it is amazing. And the gaskets actually hold together because
they have the right kind of compression of the fibers in the
paper/cardboard. Ironically the kit was in a part of a bulk lot I bought at
a yard sale or auction - yeah it was at the Tulare Antique Farm Equipment
Show auction! The cost of the lot was about $8 if I remeber right and the
first time we used this it had to have saved me $20.... And the other items
in the lot had already had enough things that went into use that they paid
for the lot several times over. My kind of deal.
     We are finally in hot weather here, the temperatures have been 100-110
degrees for a few days.... Should have been in the summer.
           Grant Brians
           Hollister, California

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of
drupert at seanet.com
Sent: Tuesday, September 28, 2010 4:39 PM
To: Antique tractor email discussion group
Subject: Re: [AT] MF-35 Hydraulic Selector Valve


Tony,

If your' selector valve is the one made/sold by TISCO then yes there are
four (4) O-rings between the valve and the cover plate.  Your' Ferguson
dealer can get them I am sure.  In fact, I think three of them are the
same ones that you would use if you did not have the selector valve but
rather had the original Transfer Plate.

BTW, are the two bolts holding the selector valve on still good and tight?
 If the leak is not at the O-rings (or the pipe fittings) then the only
thing left is the valve handle - I don't know if that can be repaired or
not.

I have the TISCO valve and have seen other makes but they all had the same
interface between valve and cover plate as I described above.  Good luck
in getting the leak stopped.

Dudley
Snohomish, Washington>
>


Hi -
> I've been reading the list for a long time but this is my first post.
> I have a 1961 MF-35 with a front-loader.  (I also have a 1954 TO-35
> and a 1947 Farmall M, by the way)
>
> There is a selector valve bolted to the lift cover plate.  This valve
> selects either the internal hydraulic fluid path for the 3-point hitch
> or diverts the fluid to the control valves for the front-loader.
>
> The selector valve is leaking quite a bit (drips on the muffler and
> makes a cloud.)  I have looked in the repair manual and catalogs but
> it's not clear if this is rebuildable.
>
> Does anyone know if there are replaceable O-rings or if the valve has
> to be replaced?  I don't see any numbers on the valve.
>
> Thanks,
> Tony Williamitis
> Ohio
>
>
>
>
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