International 656 diesel Hydro I changed all the hydraulic filters And I still can?t get to three point to lift weight very well if it goes all the way down it won?t lift any weight but with no weight on it it will creep up and then wants it gets up 3 or so inches it?s starts to lift with me standing on the three point 210lbs could it be the O-ring on the lift cylinder underneath the seat. I?m totally baffled anyone have any more suggestions I tried the linkages and all that seems OK with the draft and the lift leavers and the fluids good and clean and up to the full mark if I can?t figure it out I?m not sure we?re to start I might try and find someone to work on it but that?s getting hard to find we?re I live the old guys that worked on these are retired or don?t work on them any more PLEASE HELP