Rotary machines are continually vibrating. Any machine is unrealized in the absence of vibration. After a given amount of use, the equipment begins vibrating at a frequency greater than its natural frequency owing to degradation. Preventive maintenance is critical to avoiding unknown breakdowns. This article presents a comprehensive evaluation and diagnostic approach for two-stage gearboxes via ferrographical analysis. Using a direct reading ferrograph and a ferrogram maker, this study includes analyses of the size and shape of wear particles in lubricating oil in predicting system failure. The slide created with the ferrogram machine is then evaluated for analytical ferrography using the ferroscope. The study's analytical findings indicate that gearbox failure is caused by tooth wear and bearing failure, and that ferrography may be utilized successfully as a simple and reliable method for fault diagnostics.