matt moredick
just to eliminate the control valve ; do you have a spare to test the system with. The control vale could be a source of the pressure loss as well. If you don`t have a fluid leak , I would check the valve to see if it is ok. It is a closed system and I think that valve is likely the issue. the next possibility would be the ram itself bleeding back to the return side . the O ring could be damaged and creating the fluid loss with in the system with no visible fluid leak. my .02
just to eliminate the control valve ; do you have a spare to test the system with. The control vale could be a source of the pressure loss as well. If you don`t have a fluid leak , I would check the valve to see if it is ok. It is a closed system and I think that valve is likely the issue. the next possibility would be the ram itself bleeding back to the return side . the O ring could be damaged and creating the fluid loss with in the system with no visible fluid leak. my .02