The paper presents the selection procedure of a slewing bearing of a rotating platform drive in hydraulic excavators with a shovel attachment based on the spectrum of equivalent bearing loads. In line with the developed mathematical model of the excavator, the spectrum of equivalent bearing loads is defined according to boundary digging resistances which allow for the stability of the excavator and boundary digging resistances which can be overcome by excavator drive mechanisms. Software was developed to enable the determination and detailed analysis of slewing bearing load in the entire working range of the excavator since the same excavator model can be equipped with various working tools which can occupy numerous different positions under a variety of working conditions. The paper provides spectra of equivalent bearing loads of the rotating platform drive in a hydraulic excavator, obtained by using the developed software.
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