Abstract
The aim of this work is to assess the compliance of the estimated lifetime of the planetary gearbox of hydromechanical transmission of a BELAZ mining dump truck with the actual operational one based on the results of accelerated (forced) bench tests. Preliminary strength calculations were carried out for the two most stressed modes of movement of a mining dump truck in a quarry on the rise, where the most significant damage to gear trains takes place: for maximum productivity (power) and maximum torque. Investigations showed that the gears limiting the lifetime of the gearbox are the sun gear and satellites of the 3rd planetary series. As a result of the tests, the estimated operating time of the planetary gearbox on the bench was achieved, which guarantees an operational life of at least 400,000 km of the dump truck run.
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