This machine facilitates trenching works at cables and lines lying in gardens, schools and parks without moving too much earth. The trench depth is adjustable with a plain and clean unvaried profile given by the cutting chain width. This machine is used for trenching in compact and hard soils with small stones in size up to 50 mm. In addition to that, the trencher LASKI TR 50 H is equipped with own hydrodrive unit for better handling. While working it is used for shifting, changes of operating speed and for corrections of trench surface qualities in dependence on the given soil. Besides its operating functions this hydromotor is used as a main driving element when setting the machine in its transport mode.