Hydraulic hammer action drill

摘要

The drill is formed as a machine unit, having two hydraulic motors (4,5) serving as a torque motor (2), which in the two-speed mode can be connected in series or parallel through a control valve (10) additional to the manual valve (6) and through a relay valve (7). The relay valve is switched by the pump pressure at the pump connection (8). The control valve is formed as a 6/3 directional valve. The inlet/outlet valve (11) of a two speed automatic switch (12) is allocated to the control valve on the output side.