Hydraulic systems in the roof supports. The paper presents hydraulic systems in the roof supports for a coal mining. More important implications of increasing of support capacity and parallel increasing diameters of cylinder and pressure in the cylinder are shown. Author presented research and development directions.

Dead volume influence on energy losses in piston pumps. Author defined dead volume in the piston pumps and described the phenomena in this area. There are some of minimizing methods of energy losses presented, which are created by changes of fluid volume in dead volume.

Modernization of hydraulic system in drive system of caterpillar transporter. The paper presents part of modernization of hydraulic system in TUR 500.1 a caterpillar transporter to move drive stations of a belt conveyor. The experimental and driving tests after modification of the hydraulic system were described and the favorable results of the vehicle operation are shown.

Innovations of hydraulic field in BAUMA 2007. Part I. Hydraulics pumps and motors. There are described innovations in hydraulic drive and control field presented by producers of elements, systems and machines. Main attention focused on new designs and prototypes, which create development directions, as well as standard and typical solutions.