Re: Blades don't 100% disengage
Yes,rust can "grab" the belt and make it want to keep driving the blades..
Just using the mower would eventually wear the rust off the sheaves,but if you don't want to wait you can use some emery cloth or a wire brush on them to clean them up..
They may surface rust again rapidly however..
Another thing to check is the idler pulley on many idler belt drives had a "keeper" that not only prevents the belt from coming off the pulley when you disengage the blades,the outside of the belt drags on the keeper and it acts as a brake,so it wont tend to keep driving the blades..those often have to be positioned in a particular spot before you tighten the bolt on the idler pulley ,so it only contacts the belt when the deck is disengaged..