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.
Check out this video on two upgrades that will extend the life of your machine. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Cd15I0mWcQM.html. Thank you for supporting my channel. It is greatly appreciated.
