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I have noticed that the mower decks will shake much more if you do not run the mower deck at full speed. If it shakes a lot when your running at full speed? it may be a bent pulley, bad spot in the mower deck belt, bent blade, bent blade shaft or even a bent engine pulley. I know you said you only have 7 hours on it so if you feel it is very bad then you may want to have it looked at. I can say the D, E, L, and S series machines do not have as much steel in them as the higher end models.

@@JohnsonsSmallEngines I think i will take the blades off and check and see if they are balanced or bent.