Comparative Analysis of Gearboxes Wear in Excavators and Mining Trucks Andrey Kudrevatykh, Andrey Ashcheulov, Alena Ashcheulova and Kumis Urazbaeva E3S Web Conf., 174 (2020) 03017 Published online: 18 June 2020 DOI: 10.1051/e3sconf/202017403017