This paper deals with a failure diagnosis in gear sets using Wavelet Transform (WT). The WT is a method for the time-frequency analysis. The health monitoring by the vibration acceleration of the gear box was carried out using a power circulating gear testing machine. A failed tooth could be found out by the change of the continuous WT intensity and the amplitude change of the discrete WT in the vibration acceleration. Since the discrete WT can provide the signal with the component of tooth mesh frequency, the discrete WT was superior to the continuous WT. In this case of the failure at the dedendum surface of driven gear, the amplitude of the vibration acceleration with the component of tooth mesh frequency became larger after the failed tooth meshing. Therefore, not only the vibration of the gear sets but also the condition of tooth meshing would have to be taken into consideration to diagnose the failed teeth.
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