The article deals with issues of influence of bearings’ technical condition on the induction efficiency motors with squirrel-cage rotor. The experiments has been carried out using the tests of the induction motor at rated nominal mode, healthy bearing and with two defective ones, which had defects of inner and outer parts of cages. The bearing weariness causes the inequality of air gap, which leads the decrease of efficiency of machine. The bearings defects increase the energy losses, which leads to increased heat dissipation in contact parts of its elements, overheating and reducing of motor efficiency. More accurate data on changes of IM’s efficiency with a faulty bearing are obtained on the heated state of the machine, which is close to the actual operating conditions. The thermal imaging inspection of motor are performed, graphic dates are presented, which describe the changes in temperature units and efficiency of machine with working with faulty bearing. The diagnostic method the condition of bearings by using integral diagnostic parameters of vibrational acceleration are reviewed, that alloys analyze possible weak defects and considers the shift of the frequency response.