FIELD: excavating/transport machines. SUBSTANCE: scraper unit has base vehicle and pusher, first rotation frequency sensor installed on drive wheel of the scraper, comparator with summing input connected to the first rotation frequency sensor output, and subtracting input connected to the second rotation frequency sensor output, divider made in the form of a logometer with first winding connected to comparator output, and second winding connected to the first rotation frequency sensor output, a transformer with rotary coil mechanically coupled to logometer pointer pivot, a rectifier connected to electric terminal of transformer rotary coil, second comparator made of two feedback transistors connected to the rectifier, amplifier and low frequency filter. Winding of electromagnetic control valve is connected to collector circuit of the second transistor of the second comparator. EFFECT: good controllability. 3 dwg
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