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The planetary reducer is used to reduce the number of revolutions of the drive shaft in relation to the number ofrevolutions of the driven shaft. In the considered reducer, the power is supplied through the central gear (Sun)and it is the drive, the shaft - carrier on which the satellite gears are mounted is the output shaft. The externalgear is stationary. In a planetary reducer with constant input power, changing the number of revolutions of theinput shaft cause a change in the stresses in the roots of the teeth and the Hertzian contact stress on the gear pairformed from the central and the satellite gear. In this paper, it is analyzed changing of these stresses dependingon number of revolutions of the input shaft. The change in the ratio between the Hertzian contact stresses andteeth bending stress also depending on the number of revolutions of the input shaft