I just picked a new yard up I cut once already. The owners take good care of it. The yard was tilled and sowed in Turf type fecue in fall of 05. Since the has been Limed and every fall and spring fertlized. In the spring they always aereate and overseed with fescue. In Ma y they always put Ammonia Nitrate(UREA) on it. SO IT IS VERY GREEN. I cut the first time at 3 1/4 inches thinking did not want to hurt it with all this heat and dry we have. (HAS NOT RAINED in 1 WEEK) The owners said the next day after I cut there was lines where my tires ran that looked taller than the rest????? Can I let the deck down to 3" and not hurt the yard?????????