The brochure describes the repair of large and medium-sized electric motors at power plants. The procedure for disassembly and assembly of electric motors and devices that facilitate and accelerate these operations are indicated. Defects detected during repair of electric motors and consequences of untimely elimination of defects are given. The norms for clearances in bearings, between the stator and the rotor, for vibration are given, indicating what non-compliance with these norms will lead to. Repair and replacement of bearings, shaft straightening, alignment of motors with drive mechanism, determination of vibration causes and methods of their elimination are described. The brochure is designed for electricians and electricians engaged in the repair and operation of electric motors.