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MF135 hydraulics

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Compost

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My MF135 (year 1964) has trouble picking up a plastic layer when I'm using a new roll of trickle tape and plastic. If I lift on the back of the attachment, it will go up about 18 inches off the ground and hold there, but as soon as I put the tractor in gear the attachment goes down to just about ground level. The tractor will hold the attachment up when I depress the clutch, but as soon as it goes in gear the attachment drops. What might be the cause?
 
Sounds like the pump is bypassing when it starts to turn. Hook up a pressure gauge and go through the motions and watch the gauge.
What happens if you shut the engine off and leave the arms up? Do they sink down?
 
I don't have any way of accurately checking the pressure of the pump. If I shut off the tractor while an implement is attached the implement will slowly drop. But this has always been the case with this tractor, as well as with the MF275. I thought the leaking down was something MFs did. But, way would putting the tractor in gear reduce the hydraulics?
 
You can pick up a 3000psi gauge from tractor supply, big r or any farm type store you have near you. They run about 20 bucks. Need to know what the pressure is doing. It screws into the top cover on the right side under your knee.
You can take the response control side cover off and look inside while you work things to see if you sprung a leak somewhere. Just make sure to pull the bottom bolt first and let enough oil drain out so you dont end up taking a bath in it. Use flashlight and mirror and do NOT stick your hands in there...
Couple questions:
1) Does this machine have pressure control?
2) Is there water in the oil by chance?
3) How fast does the lift leak down when you shut the engine off? Minutes, hours or days?? If things are in good shape the lift should hold for at least a day. The more worn the cylinder is the faster it will drop.
 
The oil on the dipstick is clear and
clean, but when I checked it with the
tractor running there were a lot of
bubbles on the dipstick. I don't know
if there is a pressure adjustment, but
I think you can adjust the pressure by
screwing in the yoke where the top
link fits to the tractor. The time it
takes for am implement to lower when
the tractor is turned off is just a
few minutes. This tractor has an add
on hydraulic remote. It's mounted
just in front of the seat with the
hoses attached near the top link yoke.
Can I test the pressure using those
lines? Thanks for your help.
 
The clevis at the top has to do with draft control and not hydraulic pressure. If the arms drop in a couple mins then you have pretty heavy wear in the cylinder area. Sounds like you might have more than one issue. Is this a sudden problem or something that has always been there or... ?
 
One other thing to check too... Under the seat there will be 4 big nuts. Make sure they are tight and not loose at all. They are torqued to 120 pounds if i remember right so they should be good and tight.
 
I've checked some manuals and the early model 135s don't have adjustable pressure on the hydraulics. The tractor will pick up the implements I normally use (bushhog, tiller, cultivators, 2-row planter) but just has trouble with the weight of the plastic layer when there is a full roll of trickle tape and a full roll of plastic. I think I will have to try to work with partial rolls to solve the problem, unless I decide to take the tractor to a shop where they can work on the hydraulics. I just thought it was odd that the tractor will lift the load, but as soon as it goes in gear the load begins to drop. Thanks for the advice.
 
How heavy is the roll? No system is not adjustable, you are correct. However It will build around 2800psi of pressure if everything is working correctly. If you put in the pressure gauge and try to lift your roll what does it read?
 
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