Hydrostatic PTO Clutch won't disengate

[varover]

I could tell something was fishy long about my 2nd bushhog shear pin. The PTO clutch pedal won't disengage the PTO. All I've done so far is observe the clutch linkage which appears to correctly be moving the clutch lever on the transfer case about 1", maybe less...there's not much room for it to move further.

Anyone have any ideas?