<p>This paper delineates the procedure for crack detection in helical spring installed on a vibratory feeder using operational modal analysis technique. The variations in modal parameters were identified using vibration data acquired in the form of auto-power spectrum (APS) and cross-power spectrum (CPS) during normal operation of the vibratory feeder. In the second step, the crack was induced in one of the springs of the vibratory feeder, and APS and CPS were acquired during its operating conditions. Modal parameters were recorded through a dynamic signal analyzer in the form of auto-power spectra (APS) and cross-power spectra (CPS) in healthy as well as cracked helical springs installed in the vibratory feeder during operating conditions. The variations in modal parameters, which include vibrating frequencies, operating deflecting shapes and values damping ratios (%), MAC values, CoMAC values, contours and Bode plots were compared. Observations of these parameters were used to predict the failures in the spring of vibratory feeder.</p>