Telemetry systems are widely used in the latest agricultural machinery, both in tractors and combines. There is still a problem with managing the data recorded and stored in the telemetry systems and their purposeful use. Ways to correctly interpret, analyze, and use as much as possible of the information obtained during various agricultural technological processes has been studied.

The purpose of this work is to analyze the harvesting data collected and stored in the telematics system in order to optimize labor costs. The research was carried out during grain harvesting using a CLAAS Lexion combine harvester. By using the data of the telematics system, the working time structure and fuel consumption of the technological processes of spring wheat harvesting for one year were analyzed. During this study, the components of the harvesting time, which have an influence on the harvesting speed and the performance of the harvester, were examined. The results showed that 10% more time was spent when grain unloading stopped when harvesting smaller fields than larger fields (more than 50 ha). Fuel consumption when unloading grain after the harvester stopped amounted to 2% of the total fuel used for harvesting one ton of grain. After analyzing the efficiency of the use of the harvester, it was found that a considerable part of the working time and fuel consumption is devoted to the inevitable inefficient technological processes.