Yes, a slight amount of slack in a garage door opener chain is completely normal and necessary for proper mechanical operation. Manufacturers typically recommend about 1/2 inch to 1 inch of slack above the center of the rail so the chain does not bind or put excessive lateral pressure on the output shaft bearings when the motor starts and stops. If the chain is pulled completely taut like a guitar string, it will damage the motor. Verification: Measure the sag distance above the rail midpoint to ensure it falls within the manufacturer's recommended 1/2 to 1-inch tolerance.
1 votes
Marked as accepted