MF 135 won't lift

   / MF 135 won't lift #1  

bhooper

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Sep 12, 2022
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10
Tractor
Massey Ferguson 135 diesel
MF 135 - arms won't lift. Only will lift if I put position and draft controls fully up position, then (with draft control spring removed) reach in with a rod and push on the end of the draft control rod. Arms will raise then when I release the pressure on the rod, the arms lower. I replaced the draft spring assembly since the old one was loose and corroded. I am not familiar with hydraulic mechanics and not sure how to trouble shoot. Any ideas/help appreciated, thanks.
 
   / MF 135 won't lift #2  

lokester

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Aug 17, 2022
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3
Tractor
MF 231S, 135 and many Farmall Tractors
I too am just trying to learn the MF 135 hydraulics. Have just replaced lift cylinder and piston on one and went through the calibration/setup procedure while I had the lift cover removed (1. Draft Spring Assembly, 2. Draft Control Linkage, 3. Position Control Linkage). I used this link for most of my instruction:


It either covers or has reference to pretty good procedures on how to set up the Draft Spring Assy and Draft Control Linkage. I got a section from the tech manual on how to set the Position Control using a 3-pound weight on both Draft and Position Linkage.

That said, I am still having troubles - so will be removing the lift cover to go through the process again. What was not clear to me when going through the 3-pound weight settings was "what position are the lift arms supposed to be in when making the adjustments?"

I believe my issue still centers around the "draft" as I can remove the top-link between the brush hog and draft spring connector and put a chain from the brush hog top pin to the tractor housing just below the draft spring (basically taking the draft spring assy out of the picture). With Draft Control Lever all the way UP - the Position Control Lever will then Raise and Lower the brush hog with ease.

Did not mean to hi-jack your post but was about to submit a new post myself and it seems we both are looking for the same info.
 
   / MF 135 won't lift #3  

lokester

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Aug 17, 2022
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3
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MF 231S, 135 and many Farmall Tractors
A bit more searching on the web and I believe I found the answer to my question regarding what position the lift arms needs to be in when making draft and position adjustments: They should be UP as in the implement is raised all the way up. While I did have my arm in the up position when making my adjustment, what I did not do is have special tool MF 272 which is essentially a spacer block that keeps the ram arm from bottoming out on the lift arm cover (my bad). I found a drawing of the special tool and will fabricate one. This should make a huge difference for my situation when I go back into my tractor.

Regarding your current situation, since all you have had apart is the draft spring assy, what I would suggest is go back over how you replaced the draft spring. Look at the link above but go to page 4 and specifically post #33 that Hutch provides. He explains very well how to assemble the spring onto the assembly and then how to install the assembly back into the lift cover. If you do this part correctly, you might luck out and not have to open up your lift cover.
 
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   / MF 135 won't lift
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bhooper

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Massey Ferguson 135 diesel
Thanks for the replies lokester. Update: I have removed the top with lift arms and have it upside down on my bench. Right away I see the draft spring has somehow been pulled part way off and the draft rod has been bent. So I'm obviously replacing those. I don't see any other damaged parts or something that looks out of place according to the shop manual and yt videos I've watched. What appears to be the problem is that when I move both draft and position levers in the UP position, the control rod (that moves the hydraulic lever) does not move far enough to allow the hydraulic lever to fully move so the lift works, if that makes sense. It seems like the control rod should move all the way towards the rear of the tractor so the hydraulic lever can fully move too. I think there may be a problem with the adjustment screw on the back of the control lever yoke - it is a very short (1/2" approx.) set screw that doesn't touch anything. It is just there with a nut on it. Maybe a longer screw is needed to actually make that adjustment. Anyway, I'll check out the above link/thread to see if it will help. I'm waiting on a few parts so I'll post any significant updates here later on.

Attached are some pics of current situation. You can see the draft spring is jacked up from where is was partially pulled off. I put it back on just while working on it.
 

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   / MF 135 won't lift
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bhooper

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Massey Ferguson 135 diesel
Also lokester, here are some images from the MF-27 Shop Manual (purchased from local Tractor Supply) that may be helpful for your question about arm setting while making adjustments. I think you're correct using the block, but this has more info about that too. Hope this helps.
 

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   / MF 135 won't lift #6  

redman135

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Jul 23, 2013
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990
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nz
Tractor
no tractor now
Hello Lokester, the problem you have described is caused by WORN internal daught control linkages. You have also described the method I used to bypass the draught control to avoid a repair bill. I ran my tractor like this for 15 years before selling it.
 
 
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