The conveyor structure must be true (relative to the centre-line) and level (side-to-side). All pulleys, snub rollers, carrying and return idlers must be square with the frame (perpendicular to the belt centre-line) and parallel to each other. Is the pulley lagging worn? Belt tension must be great enough to prevent slippage between the drive pulley and the belt. Tension must also be enough to cause the belt to conform to the pulley crowns. Slippage will cause excessive wear to both drive pulley lagging and the return side of the belt.
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