Either the idler or one of the deck spindle bearings if it is happening while the deck is engaged. I didn't see where you disengaged blades and it would then go or not.
The idler is a common bearing failure possibility. Be careful to not "smoke" the belt or you'll be having to hoist the rider up in the air and replace your drive belt. If it is the drive belt that is smoking, that is.
The idler is a common bearing failure possibility. Be careful to not "smoke" the belt or you'll be having to hoist the rider up in the air and replace your drive belt. If it is the drive belt that is smoking, that is.