Its probably the loader control valve. If you pop the QCs for the curl circuit off the valve does it still happen?
It doesn't have QC but I could unscrew, but wouldn't the hydraulic oil just drain from the cylinders?
Yeah 2. But youve already determined that it isnt the cyls - so no point. If its not drippin on the floor somewhere it is the curl spool in the valve. It will have to be disassembled to fix. JD ought to have a clue about the valve they use / whether fix is feasible.It doesn't have QC but I could unscrew, but wouldn't the hydraulic oil just drain from the cylinders?