For measuring was used the combine harvester John Deere S685i with track units. For reading of tension force there was used specially developed measurement tool - a pull dynamometer. It is constructed as a towing drawbar which was connected between rear hitch of combine harvester and three-point hitch of pulling tractor. It means that measuring set moved in reverse mode. Measuring was running on the same path as in case of wheeled combine harvester: asphalt surface, maximum slope 0.2°, length of path 120 meters. Speed of towing simulated usual working speed during harvest. There were measured three variants of speed it were 4, 6 and 8 km.h-1 and each variant was repeated three times. After collecting of data for each speed variant consequently there were calculated different tensile resistance which we can observe. Tensile resistance correspond with load of drivetrain, load of engine and it directly affects fuel consumption.