rattle

****Updated with Mower info*** I have a 2016 Hustler Raptor SD 54 Kohler 7000, Spec PS-KT740-3042 725cc, Serial 4601931503 mower, manufacture 03/2016 SN 934604, Hydro-Gear Model ZH-MCBB-3EMC-3PXX SN 6059D90011. When I shut the engine off, I hear a loud rattle around the engine or transmission...