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MF 35 Lift Arms and Hydraulic Pump

A

Anonymous-0

Well-known Member
I had a problem with the lift arms on my MF 35 only going up and staying there until the pressure bled down overnight. As soon as the tractor was started the arms would go right back up and stay there regardless of where the control levers where. After helping a mechanic remove the top cover and eventually removing the entire hydraulic pump, we discovered that the small linkage that connects to the control valve at the bottom of the pump had been shoved all the way into the small hole and was stuck. We were able to reinstall the linkage back through the hole and this seemed to solve the problem. Maybe the draft lever moved too far back because of wear and this is what shoved the linkage too far but I am not sure. I thought this information might help someone having the same problem. Also, the pump can be removed from the top without splitting the tractor. It is a very tight fit and the PTO and main drive shafts have to be removed.
 
If the other person was a mechanic, why didn't he/she? pull the little trap door off the side of the trans-case and check that linkage first? That's the door with the dip-stick. Pulling the entire rockshaft cover off and the pump from the bottom should be a last-resort approach.

I'm not trying to nit-pick, but anybody who's a mechanic should know better, and if not - find out before tearing all apart. Some people pay for that sort of wasteful labor which can be a rip-off. If it was a friend doing a favor, no harm done I guess. Sounds like you've got it fixed which is good as long at you didn't pay somebody to wast a lot of time.
 
Believe me jd, we pulled both side covers off and drained the oil out before we did the more major work. The problem was that it appeared as if that linkage had come out of the pump or broke off and gone into the gear housing. We fished around with a magnet but of course we did't find it. Also, on a tractor that is 47 years old there tends to be a lot of sediment in the bottom of that housing. It would have been quite difficult to remove the small lower panel off of the pump with the pump in place and clean off and replace the gasket all the while trying to avoid getting the sediment inside the pump. I shared this information thinking that it might help someone that had the same problem with the lift arms.
 
Yeah, if it was that messy inside, seems pulling apart for that reason made sense. I just had a TO35 all part just to scrape the sludge out of the trans with a putty knife. It as 1/2" thick in some places and like clay.

Just making the point about that linkage. It's designed to be accessed from the round access panel on the side. I've had to fix a couple that were stuck.
 
I have a ten ton over head crane in my shop. If I get one of these old fellows that is all slugged up. I just hang them up at a steep angle toward the case drains and pull the side covers and steam them out. Do several a month. it has saved a lot of time and money over the years.
 
I was somewhat disappointed to see all the sludge in this thing. I haven't had the tractor that long and it seems that I have now spent enough time and money on it that I could have bought something newer with less hours. When I remarked about this to the mechanic that was helping me, he said that it would be nonsense to get rid of it at this point and that if I took care of it it would last me another 30 years! What do you think?
 
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