Abstract
The paper presents the experimental researches conducted by the authors using the gearboxes checking bench, by applying frequency analysis of vibrations. The authors first realized software for acquisition and processing of data obtained by vibration analysis (Fast Fourier Transform), then using the virtual device realized and by experiments they identified the optimum points for installing the piezoelectric transducers on the gearbox case and they also identified the optimum checking stages (speed and load) for each gear step. At the gearing teeth wear were emphasized the growth of the signal peaks for the upper harmonics of gearing frequencies, for each checking stage. The results obtained confirm the possibility to use this method for checking the gearboxes in the service network.