Issue after hydraulic fluid and filter change MF 150

thoner7 · Jun 10, 2019

I changed my fuild and filter on the tranny because I would lose power every so often(like the filter was clogged)

Oil was milky so I flushed with diesel, by running it for five mins and cycled the 3 point a couple times.

After adding some UTF that was meeting or eceeding Permatran 3, the 3 point is now jumpy when lifting (same with the front loader). But beyond that there is an odd humming sound once the lift arms are all the way up (constant pumping position). The humming noise was not present before the change.

Any ideas?? Rings on the hydraulic piston?

PS the lift arms fall when the tracotr is off.

Dieseltech · Jun 10, 2019

The lift arms will go down with engine off, that's normal. You should NOT hear the three point pump in constant pumping, if so somethings plumbed wrong or being incorrectly used. Constant pumping is for auxiliary valve use, keeps the pump turned on when lift arms are up to override the internal three point linkage that turns the pump off when arms are up.

thoner7 · Jun 11, 2019

(quoted from post at 18:09:12 06/10/19) The lift arms will go down with engine off, that's normal. You should NOT hear the three point pump in constant pumping, if so somethings plumbed wrong or being incorrectly used. Constant pumping is for auxiliary valve use, keeps the pump turned on when lift arms are up to override the internal three point linkage that turns the pump off when arms are up.

I don't doubt something is wack in there, I usually leave it in constant pumping and the draft lever raises and lowers the link arms. The only time position control works is with something lighter. With my bush hog it has to be in constant pumping and the draft control lever raises and lowers the arms

But like I said, all I've done recently is change the fluid, nothing else.

Dieseltech · Jun 11, 2019

You should NOT be using the draft lever for the bush hog!! Draft should be left fully up and POSITION lever then used for the bush hog. DON'T use Position in constant pumping unless you need the auxiliary valve to work. Pictures of the tractor hydraulic plumbing would help too, as some are not always plumbed the best way.

thoner7 · Jun 11, 2019

(quoted from post at 09:52:38 06/11/19) You should NOT be using the draft lever for the bush hog!! Draft should be left fully up and POSITION lever then used for the bush hog. DON'T use Position in constant pumping unless you need the auxiliary valve to work. Pictures of the tractor hydraulic plumbing would help too, as some are not always plumbed the best way.

Well my funky controls aside, why else would the lift arms become jerky/bouncy after a fluid change?

Did I mess up some seals with the diesel?

Do I need to purge air in the system?

Idk!!!

thoner7 · Jun 11, 2019

(quoted from post at 09:52:38 06/11/19) You should NOT be using the draft lever for the bush hog!! Draft should be left fully up and POSITION lever then used for the bush hog. DON'T use Position in constant pumping unless you need the auxiliary valve to work. Pictures of the tractor hydraulic plumbing would help too, as some are not always plumbed the best way.

What would you need pictures of?

thoner7 · Jun 11, 2019

(quoted from post at 09:52:38 06/11/19) You should NOT be using the draft lever for the bush hog!! Draft should be left fully up and POSITION lever then used for the bush hog. DON'T use Position in constant pumping unless you need the auxiliary valve to work. Pictures of the tractor hydraulic plumbing would help too, as some are not always plumbed the best way.

What would you need pictures of?

kscessnadriver · Jun 11, 2019

I'm interested to see how this turns out as well, as I have a MF150, that in order to do anything with the 3 point, I have to use the draft control to raise/lower the 3 point. The position control lever does nothing, and to use the draft control lever, it's reversed, meaning down is up and up is down.

thoner7 · Jun 15, 2019

I hooked up my bush hog and did some more fiddling with the controls.

With the 3 point control lever in the up position (in position control) I was able to use the draft lever and control the height of the mower as if it were position control. There is a small maybe 2" window where it will lift and lower and find it's position.

The lift arms are pulsing or bouncing still and I'm not sure what could be causing that.

I don't really need the draft controls to work, as I don't plow anything but snow, but I would like to fix the hydraulics problem, as it really affects how the loader handles.

ptfarmer · Jun 16, 2019

According to the MF shop manual.
Problem. Jerky, or uneven lift when implement is raising.
Possible Cause. Valve sticking in side valve chamber.
Correction. Remove pump, disassemble, and free valves.

ptfarmer · Jun 16, 2019

(quoted from post at 19:30:34 06/11/19) I'm interested to see how this turns out as well, as I have a MF150, that in order to do anything with the 3 point, I have to use the draft control to raise/lower the 3 point. The position control lever does nothing, and to use the draft control lever, it's reversed, meaning down is up and up is down.

I would say that someone had the lift cover off, and messed with the linkage. Chances are it had some sort of lift problem like a broken, or missing part, and they "tried to fix it". I've ran into a few like that over the years that were either way out of adjustment, parts in the linkage were missing, or both from someone trying to make it work with missing parts!

kscessnadriver · Jun 18, 2019

(quoted from post at 10:12:54 06/16/19)

(quoted from post at 19:30:34 06/11/19) I'm interested to see how this turns out as well, as I have a MF150, that in order to do anything with the 3 point, I have to use the draft control to raise/lower the 3 point. The position control lever does nothing, and to use the draft control lever, it's reversed, meaning down is up and up is down.

Click to expand...

I would say that someone had the lift cover off, and messed with the linkage. Chances are it had some sort of lift problem like a broken, or missing part, and they "tried to fix it". I've ran into a few like that over the years that were either way out of adjustment, parts in the linkage were missing, or both from someone trying to make it work with missing parts!

That is my hunch on it as well. One of these days, I'll open it up and see what the case is. I'm hopeful its not too terribly bad

thoner7 · Jun 21, 2019

So before I read this thing apart, what are the chances it's the wrong fluid? I know it calls for permatran III or whatever, but I read online here that people have used Travelers that meets spec without issues. I used Travelers.

So Im thinking it's either the fluid, or, I messed it up when I flushed with diesel.

Issue after hydraulic fluid and filter change MF 150

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