Fresh oil is always good!Is it normal for the deck gearbox/auto connect shaft to be that hot? I can’t keep my hand on it after running it……it’s hot. Deck is adjusted properly and the carrier bearing is adjusted, deck can be installed/dropped very easily. Gearbox has the proper oil level in it but it’s a few years oil I’m guessing. Bought the unit last year and I doubt the old owner changed it. I am going to change it out to get fresh oil in there to see if that helps.
I've never touched mine but I do know that its turning 2000 rpms. I'd say heat is to be expected. Do you have an infrared thermometer that you can actually get a temp reading from it? I'd like to know what temp its getting to.