After initial tower start-up or the installation of a new belt, the belt tension must be readjusted after the first 24 hours of operation. The condition of the belt and belt tension should then be checked and adjusted quarterly.
To check the belt tension, place a straight edge along the belt from sheave to sheave or, alternatively, use a tape measure as shown.
Apply a moderate force by hand (approximately 40 lbs) evenly across the width of the belt in the center of the span between the two sheaves. If the belt deflects between 1/4″ and 3/8″ as shown, the belt is adequately tensioned.
There should be no chirp or squeal when the fan motor is started.