When the blades are engadged I hear the rattling and vibrating a lot of the time but more recently, when I'm driving it without the blades going, the whole deck vibrates and rattles when I turn or in different positions of the front wheels. The blades on it are new. Besides that, usually when I'm driving without the blades going, I hear a loud knocking sound coming right from the belt. When I look at it, it seems pretty loose on the pulleys