FIELD: self-loading hauling machines. SUBSTANCE: electrohydraulic power amplifier is made with two hollows of negative feedback under opposite ends of throttling slide valve of amplifying output stage. Connected to one hollow is flexible chamber with regulated volume and each hollow is connected through adjustable throttle to actuating line of electrohydraulic power amplifier. Actuating line is communicated with hollow of hydraulic cylinder loaded with working equipment mass. Transducer of position change of hydraulic cylinder piston is made in form of reversing transducer of flow rate, and negative feedback unit is made in form of integrator. EFFECT: higher efficiency. 1 dwg
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