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

[Dennis Johnson]

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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