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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Replacement of Hydraulic Piston with newer - MF135?

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Robil

10-29-2007 09:56:23




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I pulled the side cover from the MF135 to see the cause of the rapid leak down. I lifted a heavy snow blade, turned off the engine, and saw a stream of fluid coming from the back of the hydraulic piston. Even with the engine running I saw the fluid coming out the back of the piston area. I saw no other leaks or bubbling of the fluid anywhere. The lift is strong, responsive, it just leaks down very fast.

I assume it is a set of bad rings and the lift cylinder is ok. I will check that out. Is there a newer version of the piston that uses a rubber ring like the Ford models, or do I have to replace the rings with the 3 metal ring sets?

Also, I noticed that if I put the lever on to "constant pumping" that there was a rapid flow of fluid out the back of the piston area. Is this nomal, or is it just another sign that I have found the leaking culprit? Thanks.

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DavidP, South Wales

10-29-2007 11:43:04




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 Re: Replacement of Hydraulic Piston with newer - MF135? in reply to Robil, 10-29-2007 09:56:23  
Hello,
A leaking piston is the likely cause of your leak. There is an O ring between the cylinder and the lift cover which should be checked as well.
You may have worn or broken piston rings but you may also have a scored bore so that needs to be checked. To the best of my knowledge there is only a direct replacement of the cylinder piston and rings.
In selecting 'constant pumping' all that you are doing is pushing oil through the 'gap' at maximum pressure and will only highlight the source of your leak.
DavidP, South Wales

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