[AT] It's trying, but... no lift

[Cecil Bearden]

I remember when the MF65 was a BIG tractor.  We pulled 4-14in plows with 
a 65.  A big step up from a 2-14 behind a TO35 Ferguson.

Cecil in OKla


On 9/15/2016 8:56 AM, Dennis Johnson wrote:
> I have a MF35D that also has lift problems. I am guessing either the piston seal broke, or the pump went out. Before this happened I could lift round bales with a rear spear.
>
> Mine will now lift for 3 to 5 minutes until the oil warms enough and then nothing.
> Just waiting to get to that project after I get a few others completed.
>
> The MF 35 series are great tractors. When I was in High School, I drove am MF65 one summer back when wheat fields were plowed.
>
> Thanks,
> Dennis
>
>
> Sent from my iPad
>
>> On Sep 15, 2016, at 8:48 AM, Cecil Bearden <crbearden at copper.net> wrote:
>>
>> Those systems were a piston pump with an unloader valve and a relief
>> valve.  I have seen a few relief valves go bad in my years of working
>> with Ferguson systems, but it is rare.  It is possible that sitting out
>> in the open over the winter in NY created enough condensation that the
>> spring in the relief valve rusted and broke.  The control/relief valves
>> were pretty reliable, but they had their issues.  My first guess is that
>> the rings in the top deck hydraulic piston have broken and the oil is
>> leaking by in the lift piston.   There is also the possibility tht this
>> machine has set for so long and then moved around and loosened up the
>> crud in the bottom of the sump and the screen has picked it up.
>>
>> Please note the what I am going to tell  you is from the regular 135
>> tractors and the 35 tractors.  The vineyard may be different,
>> conceptually they are the same..   A good FACTORY service manual is
>> invaluable here.   I got burned by I&T manuals, so I really do not
>> recommend them anymore.  The Wisconsin historical society may have a
>> reprint of the manual available for you.  They have a lot and their
>> charge for reprints is really cheap.
>>
>> On the lift control quadrant ( right side hyd lift lever )  There should
>> be 2 levers.  The long one for lift and the short one for draft.
>> Sometimes the draft control will over ride the lift.  The draft control
>> lever(short one with the square metal knob) should be between the 2
>> arrows that say draft on the quadrant.  It should be stamped into the
>> metal.
>>    That knob should be in the center between the arrows.  Then try to
>> raise the lift with the other lever.  if not, leave the lift lever a
>> little below the top and then move the draft lever to see if anything
>> happens.  This might fix your problem.  If not see below.  If you are
>> going to change the fluid, you need to clean the screen.
>>
>> On the left side of the transmission, under the seat is a round plate
>> with the PTO lever.  Remove the plate with the lever. Disconnect the PTO
>> shaft and start the tractor with the mower attached.  Raise the lift and
>> watch for fluid draining from the top deck lift piston and dripping down
>> into the sump.  A drip is OK, we just do not want a gusher..   If it
>> just drips, your problem is in the bottom.
>>
>> inside the transmission about 4 to 6 inches in the bottom is a filter
>> screen that looks about the size of a pop can It has a top and bottom
>> cup, and is separated about an inch in the middle.  The top half has a
>> metal handle piece that you use to unscrew counterclockwise the top is
>> attached to a bolt that screws into the intake of the pump.  You take
>> the screen with both cups out and wash it out.  This is easiest when the
>> oil is drained.  There are 2 drain plugs,  one under the front of the
>> transmission behind the clutch housing, and the other under the plate
>> you took off. If the screen is full of junk, you have found the problem.
>>
>> When you replace the round plate with the PTO lever,  make sure the
>> inside lever goes in the slot of the PTO shifter.
>>
>> If you have any problems, take some pictures and post on here. We will
>> try to fix it remotely!!
>>
>> Cecil in oKla
>>
>>
>>> On 9/15/2016 7:38 AM, Bo Hinch wrote:
>>> Sounds to me like you have a piece of trash in the pressure unloader valve
>>> .
>>>
>>>> On Thu, Sep 15, 2016 at 6:28 AM, Stephen Offiler <soffiler at gmail.com> wrote:
>>>>
>>>> Just a few quick thoughts Scott.
>>>>
>>>> 1)  you used the word "suddenly".  Was it literally fine one minute and
>>>> problematic the next?  Or, did it actually go away sort of gradually?
>>>>
>>>> 2)  Have you tried it again since?
>>>>
>>>>
>>>> Steve O.
>>>> PS:  when I'm faced with draining ~8 gallons (I've got about 7 gallons in
>>>> my modern-ish Ford 1520 hydrostat)  I drain part of it and stick the drain
>>>> plug back in, then deal with the amount (2-3 gallons) I've drained, then
>>>> repeat as required.  OK, yeah, putting the drain plug back into a stream of
>>>> draining oil is a bit messy admittedly.
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