Garage door opener belt appears frayed, cracked, or is slipping on the pulley.

Safety first: Disconnect power before working near the belt and pulleys.

• Inspect belt: Look along the entire length of the Craftsman belt for cracks, missing teeth, or fraying. Replace if any damage is found.
• Check pulley alignment: Ensure the motor pulley and door-end pulley are in line. Adjust brackets if necessary.
• Set proper tension: Adjust the belt tension nut so the belt has slight deflection when pressed at the midpoint. Do not over-tighten.
• Clean belt path: Remove any debris or buildup on the pulleys and rail that could cause slipping.