MF 135 Hydraulics just quit?

[jgriff0728]

I've got a MF 135 with the perkins in it. It's been a dependable machine for me the last few years I've owned it. Last year, I had a local guy that install a new hydraulic pump for me. They got to the point where they had a hard time raising my equipment, if they could at all. After I got it back, all was great, the hydraulics were strong! Until a few weeks ago. I was using the tractor to pull out some landscaping shrubbery. I just chained it to from the shrubs to the quick hitch attached to the lift arms, and used the hydraulics and tractor to lift and pull the stumps/shrubs out. It all worked great. Worked when I parked it. But a week or two later, I went out to get on the tractor and it wouldn't even lift the arms.

I wouldn't think that little bit of work would have been too much for the pump and tractor. Heck, I'm sure it lifts more when picking up some of these implements. I don't know if I burnt the pump up, or something else failed. I did some research online and read up some on the service manual. I pulled it into the garage and took a look inside. The oil was a little milky from water intrusion. It couldn't have been like that too long, as it spends most of it's like in a covered building. But I suppose that may have had something to do with it. I did a fluid change and filter change to no real help. I did read that oil shoulld be coming up the stand pipe. There is some that comes up, but it's not much pressure. I can pretty well stop the flow with my finger.....does anyone know how much pressure that should be under? Does that sound right?

I've got the top cover pulled right now. I tried a new relief valve. Something I read said that may have failed, which would cause the sudden no-working situations? It didn't seem to make a difference from what I can tell, or at least it doesn't seem build any more pressure of the oil coming out the stand pipe. Are there any other/more tests I can do to try to see if the pumps the problem? Or maybe it's in something else. I'm just doubtful that the pump, only being a year old, would fail that easy/quick.

Any suggestions are appreciated!

 

[Bob NY]

I've got a MF 135 with the perkins in it. It's been a dependable machine for me the last few years I've owned it. Last year, I had a local guy that install a new hydraulic pump for me. They got to the point where they had a hard time raising my equipment, if they could at all. After I got it back, all was great, the hydraulics were strong! Until a few weeks ago. I was using the tractor to pull out some landscaping shrubbery. I just chained it to from the shrubs to the quick hitch attached to the lift arms, and used the hydraulics and tractor to lift and pull the stumps/shrubs out. It all worked great. Worked when I parked it. But a week or two later, I went out to get on the tractor and it wouldn't even lift the arms.

I wouldn't think that little bit of work would have been too much for the pump and tractor. Heck, I'm sure it lifts more when picking up some of these implements. I don't know if I burnt the pump up, or something else failed. I did some research online and read up some on the service manual. I pulled it into the garage and took a look inside. The oil was a little milky from water intrusion. It couldn't have been like that too long, as it spends most of it's like in a covered building. But I suppose that may have had something to do with it. I did a fluid change and filter change to no real help. I did read that oil shoulld be coming up the stand pipe. There is some that comes up, but it's not much pressure. I can pretty well stop the flow with my finger.....does anyone know how much pressure that should be under? Does that sound right?

I've got the top cover pulled right now. I tried a new relief valve. Something I read said that may have failed, which would cause the sudden no-working situations? It didn't seem to make a difference from what I can tell, or at least it doesn't seem build any more pressure of the oil coming out the stand pipe. Are there any other/more tests I can do to try to see if the pumps the problem? Or maybe it's in something else. I'm just doubtful that the pump, only being a year old, would fail that easy/quick.

Any suggestions are appreciated!

Have you confirmed that the control valve is moving in and out of the pump as it should?

 

[jgriff0728]

Have you confirmed that the control valve is moving in and out of the pump as it should?

Hey Bob, thanks for the reply. I believe I checked the valve and it was moving in and out. I know I manually moved the lever arms back and forth while it was running and it seemed to be working correctly. When I pushed the arms forward, the oil fell back down the stand pipe that comes up out of the pump, so I figured it was doing something. I can check tonight after work that the rod is in fact moving in and out with the levers.