After some issues i decided to clean out the hydraulics. I dismantled the hydraulic pump, cleaned and reassembled it. I will replace the release valve and am considering servicing the valves etc but, just to be sure it was ok I reassembled. On testng (outside the tractor) I find that the relese valve is stiff and doesn't return down unless the lever valve control pushes it. As this is my first attempt at all this I'm not sure if that is normal or if its a sign that there is an issue. When the release valve is outside the pump it springs back easilly. Is there an issue with the osscilator body. should I try and remove that ? It does look pretty solid in there. ?