grinding

Hello had a similar post maybe last week + I'm adding this post also. I was hoping to get a clarification on something so I'm watching a YouTube video + what I need to know is if the mower deck is not engaged and everything sounds okay and then I engage the mower deck and I hear this grinding or...

So, I have a lawnboy walk behind mower that has a kohler engine, the elc. start works and fires the mower up right away but sometimes makes a grinding noise. It seems the gear isn't dropping fast enough after starting the engine and the teeth for the solenoid gear are grinding with the flywheel...