* The large groove (fastest speed) of the motor shaft step pulley is bent. The motor vibrates excessively when the belt is in this groove. Use the other grooves (slower speeds) until the pulley is replaced. | * The large groove (fastest speed) of the motor shaft step pulley is bent. The motor vibrates excessively when the belt is in this groove. Use the other grooves (slower speeds) until the pulley is replaced. |