I was out cutting yesterday...my customers wanted their lawns cut even though they were VERY dry. It was extremely hot out and the mower was kicking up a lot of dust here and there so the machine got quite dusty during the course of the day. During my last lawn i noticed the left side of my deck on the Bobcat ZTR becomming ever so "Black" with this graphite looking dust. (The side furthest away from the chute) The dust was very fine like powdered graphite, and dark black in color. I thought it could simply be the dust from the grass and dirt, but that would be a dust brown in color...not deep black. I hope this isnt a big problem...it was just strange seeing this dust all over the deck of the machine- any insight would be greatly appreciated! Thanks!