FIELD: machine building.
SUBSTANCE: device comprises boom, bucket, hydraulic cylinders of boom, balancing pneumatic hydraulic cylinder, gas balloon, hydraulic pump, main and additional hydraulic distributors of boom control. Piston cavities of boom hydraulic cylinders are arranged with the possibility of connection to hydraulic pump via main hydraulic distributor or additional hydraulic distributor of differential type, providing for the possibility to connect simultaneously piston and stem cavities of boom hydraulic cylinders to hydraulic pump. At the same time piston cavity of balance pneumatic hydraulic cylinder is connected to gas balloon charged to pressure of more than 10 MPa, and ratio of squares of piston diametre and boom hydraulic cylinders stem is within the range of 
.
EFFECT: energy efficiency, increased capacity, higher efficiency factor of working equipment.
1 cl, 3 dwg
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