An output mechanical power of electrical driving system is directly related to electrical power consumption; proportional relation. This direct relation is a foundation of concluding of failures, manufacturing imperfections, wear and tear of gears used in driving systems. The paper is devoted to consideration how to investigate abnormal mechanical states caused by mechanical parts (gears in this case) of driving system based on analysis of consumed electrical power. Driving systems for power transmission are using different gears boxes (reducers and multipliers), mainly are helical gear boxes. Most of gear use wheels with "teeth". Shapes of teeth are no perfectly identical due to imperfection of mechanical treatment at the production process. As a result of long time of gear box running, teeth are loosing their original shapes. Cracks may arise and even tooth or teeth may be broken. Such situation should be predicted before gear box fail down. The symptoms of such situation are analysed in the paper. The uncertainty analysis is a key for successful deduction about the state of gear.
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