The low-speed hydraulic damper of friction vibrations. The reasons of friction vibrations occurrence in the feed units of grinders have been listed. The ways of these vibrations minimizing have been described. The concept and calculations of the low-speed hydraulic damper have also been presented.

Innovative solution in filter technology. The innovative filter element technology Betamicron®4 has been presented. It has width functionality and many advantages, like the operational reliability, what improves protection of hydraulic components and reduces operational cost.

Fair „AGRITECHNICA 2007” Part I. New trends in the development of agriculture machines with hydraulic drive and control are discussed. New developed hydraulic systems applied in agriculture tractors are described in details. Application examples of known manufactures are presented.

The experimental tests of hydraulic radial piston motors. The method of modernization of hydraulic motors in travelling mechanism of caterpillar transporter is presented. Experimental stand and tests of adapted motors are shown. The tests confirmed proper work and advantages of new motor construction.

Application of hydraulic fluid HFA, HFC and HFC-E. Fire resistance and water contain fluids HFA, HFC and improved HFC-E has been described. Condition monitoring of these fluids has been recommended. Requirements of the fluid maintance have been mentioned. The operation advantages and application range have been discussed.