I've got a 4010 MCUT and my PTO seal is leaking. Not really bad, but enough that if I run a post hole digger or brush hog, it gets wet back there. The area is caked up pretty good with oily grass and such. I put about 50 hours on the tractor a year and it seems to lose around a quart in that time. The price of the seal isn't an issue, just the time it takes to change it, which honestly doesn't look like it would be long either. Question is more of how serious is the issue. Is there a chance of a catastrophic failure of the seal and losing all my fluid and destroying my transmission, or is it just a minor annoyance that I need to make sure I keep up with?