A method for detecting excitations leading to the damage of the gears and bearings working surfaces has been developed by means of experimental study of the dynamic characteristics of the metro tunnel escalator drive gearbox in normal and bad performance. The technique is based on the acquisition and analysis of low and high resolution spectra. The technique is tested during the analy... https://www.roneverhart.com/M-M-s-Peanut-Bulk-25LB-Case/