MF 35 hydraulic help needed asap

Jim in michigan

Well-known Member
OK, so we replaced the hydraulic pump on the MF35, still nothing
on the 3pt lift. Where do I go from here? Points to check please
and tips are helpful thanks
 
Two thoughts with the limited information provided.
1 Do you have a valve mounted on the lift cover, under your right leg, sitting on tractor? In correct position?
2 Is the draft lever in the up position?
 
I have one finger of each valve one each side of the control on the pump, is that the right way? The draft control has been triedin every position too. The control for the lift barely moves, is that normal? Tried moving the valve on the new pump by hand but didn't make a difference
 
"The control for the lift barely moves, is that normal?"

Nope ! Sounds like you have a internal linkage problem. Now that's a problem I can't help with. There are setups to go thru with the lift cover removed. A repair manual will have the procedures. More help will be coming from the experts on here.

What was the original problem, before the pump change?
 
Hello Jim,
From your description,no. On the 35/65 etc both the vertical levers MUST be in front of the pump arm and roller when the cover is installed. Operating the quadrant levers will then push the pump lever rearwards against the spring pressure on the control valve. Make sure also that the steel tube which fits under the cap on the hydraulic cover is correctly inserted in the front plate of the hydraulic pump.
Please let us know what you find.

DavidP, South Wales
 
Hello there. Just a few quick thoughts. Is it a dual clutch? Is the pump shaft actually spinning? Place the pto in standard drive as oppose to ground drive. Watch the PTO shaft while trying to operate the hydraulics. This will indicate if the pump is spinning. If all this is ok then turn attention to the pump. The control valve (lever on pump) should be moveable by hand if you remove the inspection cover. Bit messy but removed the valve or cap on top of the stand pipe. Oil should flow from here when the lever of the pump is moved. Try establish if you have oil flow to the lift cover as this will narrow it down for you.
 
Hi,

If you look on the hydraulic cover (where the seat is mounted), you should have one plug on each side, 3/8" BSP is I am not wrong. Let the tractor be stopped, and don't worry about the levers or anything.
If you have a a male quick connect with 3/8" pipe thread you can screw that in to the whole, is not take a piece of paper and roll it around an air-gun nozzle, and fill air in. The hydraulics should go up. If it does not go up, the following is wrong.
Either the control valve is in the wrong position so the air leaks out there, or you have a leak somewhere else. If the control valve is in the right position and the lever with the ball is liftet up, and the draft control lever is down, and the lower link arms go up, and then drop down when you remove the air pressure, you know there is no leak in the piston / hydraulic cylinder, and no leak anywhere else either between the control valve and up to the cylinder.

You say you have replaced the pump, but you do not say if it is an old pump, or a brand new pump. If you know for a fact that the pump is good and the control valve is good, and the hydraulics goes up when you apply air pressure as mentioned above, it can not be anything else than the control valve being in the wrong position.

Then, there is another thing. Did you check if the new pump had the safety valve mounted, or just a hole there ? Sometimes the new pumps comes with a steel plug in the hole where the safety valve is supposed to be, and that always ends with a cracked hydraulic cover. But, if the hole is open, the oil will just go out there and nothing will happen no matter how much to fix the rest.


Bill
 
When you first posted this, my thought was- still is, how do you know the pump came out good? And if the pto is still not right? You might as well just tear it all apart again.
If you are lucky, Bill's thought is an easy fix, if the pressure cooker vent isn't inplace, or working right, you either won't get pressure, or you will blow something- like the cover, right in half. But again, if the pto isn't even running right, you ain't even back to first base. Get in there and look around or do it again. Good luck.
 
No, customers tractor, no hydraulics originally and PTO not working right. Now we have lift after pump replacement, but doesn't go down unless I move the fingers manually .
 

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