Posted by Norbert on February 19, 2015 at 19:24:43 from (124.197.42.99):
We had a major balls up trying to fix the hydraulics on my "new" MF 135. Can anyone help me trying to understand what went wrong so if we are able to organise a new housing, we don't make the same mistake again?
I'll try to explain what happened. The 3 point linkage only lifted as high as the draw bar and only responded to the draft control (outer quadrant) and nothing happened when moving the position control lever. We bought the work shop manual and got stuck into it...
Drained the oil, removed side covers, reached in through the "response control" side cover and removed roller then lifted top cover off and finally removed the quadrants. Of course it was not as easy as it reads and we had to put a fair bit of heat on some (most) bolts...
We saw immediately that the tube of the inner quadrant (position control) was rusted away so of course we thought that might be our only problem and the reason why the arms only lift up about 1/3 of what they should come up to. Ordered the spare part and three new gaskets and put everything back together a couple days later. 20 l of brand new UTF, side covers where still off, we thought we can give it a test run...
Reading the synchronization and adjustment section in the workshop manual that one has to do after reassembling was still giving us some headaches and we weren't sure how we will go about this.
Anyway, we turned the key, engine was on idle, draft control lever sort of almost up and position control lever DOWN (?see photo). However, the lifting arms started to lift immediately and it was beautiful to watch that for the first time for probably a very long time they were going all the way up! Well it sort of didn't stop there, the pump kept on pumping, the ram kept on pushing and something had to give...in our case a loud crack and the whole tractor pretty mush split in half!!!! What a mess! it all happened with a few seconds and no warning whatsoever! Never thought that was possible but here you go. That little pump can deliver a hell of a punch!
Check out the photos and tell me if you know anyone else who has ever achieved this!
But as I said, most importantly I would like to figure out where the hell we went wrong so that we don't make the same mistake again if we ever are able too get our hands of the rear end housing of a mf135. Does anyone know if the housing of a 35 is exactly the same then of my 135?
Where is the pressure relief valve and what does it look like and how does it get activated? Obviously that would be where I start looking.
OK, let's get the ball rolling. Looking forward to your comments!
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