RESTORATION OF IMPORTED HYDROSTATIC TRANSMISSIONS (ON THE EATON 6423 EXAMPLE)
The agricultural machinery fleet in the Republic of Mordovia is currently equipped with modern energy-rich equipment not only domestically produced, but also foreign, including combines of the John Deere company. Studies, conducted at the department of technical service of machines FSBEI of HE "NI MSU named after N.P. Ogarev", have shown, that the drive gear of the combine harvesters W650 is equipped with a hydrostatic transmission EATON 6423. There are no failures during the warranty period due to failure of these hydraulic units. At the same time, it is established that the first cases of hydrostatic transmission failures begin to occur after 8-9 years of exploitation. The failed hydraulic units were decommissioned and subjected to research of the failure causes. The results of studies on the identification of defects in parts of the hydraulic pump and hydraulic motor, the reasons for their occurrence are presented in the article; the possible causes of the efficiency loss of the EATON hydrostatic transmissions were established; the main resource-limiting compounds were identified, possible restoration methods were determined, and technological and structural measures were developed for their repair and subsequent performance monitoring. As a result of bench tests, the volumetric efficiency coefficient ƞ<sup>н</sup><sub>об</sub> (efficiency) of a repaired hydraulic pump was determined, which was not less than 0.95 compared to a new one. The complex of the conducted studies and restoration operations of the Eaton 6423 hydrostatic transmission parts made it possible to restore its performance to the level of a new one.