TECHNOLOGICAL PROCESS OF DIAGNOSING TECHNICAL CONDITION OF HYDROSTATIC DRIVES HST-90, 112
The technical state of such hydrostatical transmissions is estimated by the magnitude of the overall efficiency, which is the product of the pump feed rate and efficiency motor. Operation of HST with low values of volumetric efficiency (up to 20%) leads to an increase in the fuel consumption of the drive motor, as well as to a decrease in the productivity of the agricultural machine. Based on the developed method of diagnosis and the measuring complex - a hydrotester, a technological process for diagnosing HST-90, 112 in operation. Diagnosis of hydraulic drives is carried out on farms before the start of seasonal work or when storing combines for storage, which allows a decision to be taken to further operate the hydraulic drive or replace it. The technological process of diagnosing is issued in the form of a set of technological documentation in accordance with GOSТ 3.1105-84. Diagnosis results HST-90, 112 on combines Don-1500B in the farms it is possible to state that the developed technological process and the measuring complex - a hydrotest, allow to register the values of the decrease in the pump feed rate and the efficiency factor motors with coefficient of variation 0,025-0,054. According to the results of operational tests, the calculated dependences have been obtained, which allow calculating the spent resource in a clock with a hydraulic pump t<sub>н</sub> and hydraulic motor t<sub>м</sub>, which makes it possible to plan a replacement HST when operating combine harvesters on farms.