Just as I started baling hay yesterday, the clutch on my 3340 wouldn't disengage. There was fluid dripping from the clutch pedal so I'm guessing the clutch master cylinder is going bad. I added brake fluid to the reservoir, everything seemed ok so I continued haying. So far, it's continued to engage/disengage for 2 days without another problem! Just had to add fluid one more time. Thanks to the search option here on Zetor World, I found out how to access the master cylinder, plus I found a place to get parts. There seems to be 3 or 4 different cylinders that will fit this tractor. Looks like I'll have to remove and replace it as soon as I finish haying. Not much more to go. Keeping my fingers crossed for good luck!