Just got my Cub Cadet LT1 42" deck tractor and I have a question... when I engage the mower deck it sort of jumps a bit and while it's running it seems to have a vibration to it. It's not a constant vibration, it sort of fluctuates. Is that normal? I've been using numerous ancient Wheel Horses and when you spin up the decks on those it's just a whirring and really no vibrations, in fact on occasion on the old WH I found I had forgot to start the deck back up after stopping it for some reason - I didn't notice it wasn't running. Is the 42" Cub deck supposed to be perfectly smooth or can I expect that it's gonna make me aware it's running? One more question, is there supposed to be any timing between the left and right blades or should they just pretty much coexist closely side by side no matter where each one is in relation to the other? Thanks.