I got a Gleaner N6 for back-up so it's been sitting for almost 10 months. But now that I need to use it, I couldn't get it to work. The main clutch won't disengage even though it was fine when parked. I'm worried about causing damage so I haven't really done anything more than using hammers and chisels to fix it. Any thoughts on why this would happen after sitting? Could it be a stuck hydraulic cylinder or maybe moisture ingress causing it to bind up?