stuck

It makes a bit of a rattle racket, and when I flip the switch I can see the clutch plates move together more to engage. So it looks like it is not disengaging all the way. I'm not familiar with this device at all and need to fix it so I can use my rear hydraulic tiller in the coming weeks. What...

I'm fixing a '73 140 and sat out for 2 years. Hydraulic levers all move together in one motion rather than independantly. I removed the set screw on the last arm on the inside (and the linkages to the spool valve obviously), but damn thing won't come off. Am I missing something, as I don't...