I have a 2001 Super Z with only 65 hours on it. Yesterday I had it out and had to cut through some 3 foot grass. I went nice and slow and it went through it like butter. Only problem is I noticed my deck shakes back and forth at low idle. I didn't notice this before but I am not sure if it was or wasn't doing it. Anyway, my question is could I have done something that has caused damage to the machine? I didn't hit any rocks or stumps. Thanks for the help.