The other day when I was mowing with my 1025 I heard the mower noise pitch change slightly through my earmuffs and felt the vibrations of the tractor change a tad. I couldn't pinpoint exactly what changed, but there was something different now compared to the first 20 minutes of mowing. It was a very slight change, but something was different.
After letting it bug me for 5 minutes I finally decided to stop the tractor, pull off the deck, and have a look around. Eventually I found a four inch long 1/2 inch wide stick wedged under the deck belt. It wasn't rubbing hard, but it has a polished spot from the belt. I haven't the foggiest where I picked it up, but I did realize that I should have checked out the tractor when she first started talking a different tune and my gut was telling me something isn't right.
After clearing the stick, I pulled out the grease gun and hit the zerks on the deck and the pto shaft for good measure.