How do you loosen pulley bolt on lawn mower?

To loosen the pulley bolt on a lawn mower, first ensure the mower is turned off and disconnected from the power source. Use a socket wrench to turn the bolt counterclockwise; if it's stuck, apply penetrating oil and let it sit for a few minutes. If the pulley spins while you try to loosen the bolt, you may need to secure it with a strap wrench or hold the pulley with a suitable tool to prevent it from moving.