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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF255 Hydraulics

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Jerry (AL)

09-23-2005 17:21:57




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Hooked up a 10 foot hydraulic disk today and got a little problem. Don't know what I'm looking at. Auxiliary hydraulics would very slowly and barely raise the disk. Last time I used it was May time frame and it worked fine. No leaks anywhere. Had been using the three point lift for moving some 1500 pound bales OK.

Don't know if a cylinder could go bad and not leak externally or if the lift is acting up. Any suggestions to point me in the right direction

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Case450

09-23-2005 20:25:39




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 Re: MF255 Hydraulics in reply to Jerry (AL), 09-23-2005 17:21:57  
If it worked fine before and there is no external leaks that you could have bad cylinder seals. there not that expensive to rebuild. figure around fifty bucks or so per cylinder. hope that helps



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Big Dean

09-23-2005 18:20:02




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 Re: MF255 Hydraulics in reply to Jerry (AL), 09-23-2005 17:21:57  
Jerry do you have the factory auxiliary hydraulics or are you using one of the valves that mount in front of the seat on the liftcover. It is possible for the piston seal to let the oil bypass and not have an external leak on the cylinder.



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Jerry (AL)

09-23-2005 19:27:29




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 Re: MF255 Hydraulics in reply to Big Dean, 09-23-2005 18:20:02  
This is the factory auxilary unit that mounts on the left of the seat near the PTO lever.

Thought that the filter might be restricting flow some how. Fellow said he replaced it when I bought it but no faith in that at all. I've never used it much until the last year or so.

It does feel on the lever itself that it's a little too easy to operate for some reason like no back pressure. Could just be me.

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Big Dean

09-24-2005 06:09:48




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 Re: MF255 Hydraulics in reply to Jerry (AL), 09-23-2005 19:27:29  
The Factory auxiliary hydraulic system is a complete different system from the three point system so lifting the heavy bales would not effect the auxiliary hydraulics. The problem you are having is probably either the piston seal in the cylinder is bypassing. If cylinder piston is bypassing when the valve in the center position the disk would leak down. A weak auxiliary pump will cause this it could wear even without using it as it turns all the time the engine is running. The suction filter for the auxiliary and the three point is the same filter. The one that you access through the hole with the three corner plate on the bottom of the rear center housing. I really doubt that the filter is causing that problem if the three point is still working OK. I have never saw the filter up by the auxiliary valve cause the problem you are having. Hope this gives you some where to start looking.

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