Posted by Jason Harville on March 27, 2012 at 12:16:12 from (12.197.170.254):
Hi, I have a MF 255 that is having hydraulic problems. I just bought this tractor so the history of the hydraulic system is unknown. Here"s what I know: The loader cylinders have new seals installed. The lift cylinders work for a few minutes if the fluid is cold but it becomes less and less responsive with use. The system was low on fluid so I added some universal hydraulic fluid. I later found that the fluid I used was a 20 weight fluid and the 255 needs an 80 weight fluid. I drained 5 gallons of fluid out and added 5 gallons of 80w90 to the sump. The system worked beautifully for about 5 minutes and then gradually got less and less responsive again. I put a pressure guage on the aux line while the engine was warm and get about 500 psi when I initially kick in the selector lever. After about 3 seconds the pressure is nearly 0psi. I know that the pressure should be above 2300psi but I"m not sure if my test is valid. My return line is still hooked up to the loader valves which are in a closed position. Would this affect my pressure test? I also haven"t checked/cleaned the filters. Does this sound like a problem that filters could cause? To me it seems like filter problems would be worse when the oil cold/thick but maybe I"m missing something. Any help/advice would be appreciated. -Jason
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