I've been locking my clutch petal down on my 07 L3400dt when not in use, but doesn't seem to make any difference, the tractor still locks up in gear when I work with it, not every time but enough so its starting to get aggravating, and the tractor feels like there's still some drive on it when the clutch petal is all the way down, but when its on smooth flat ground like a garage floor it shifts good. The tractor is used once a week for something, so how can rust get on the clutch, and at 700 hrs. how can the pressure plate be wore out. I know what your thinking, stay on smooth flat ground and I'll be all set.