Hydraulic drive in front of a drilling apparatus

A method for operating a hydraulic drive that comprises (i) a hydraulic motor configured to drive a drill, (ii) a main pump to which the hydraulic motor is connected in a closed hydraulic circuit via a first working line and a second working line, the main pump having a displacement volume that is steplessly adjustable, (iii) an actuating cylinder configured to adjust the displacement volume of the main pump, (iv) a control valve connected to the actuating cylinder, the control valve having a first feed connector and a first return connector, and (v) a pressure reducing valve having an outlet connector to which the first feed connector is connected, wherein the first feed connector is adjustable to a predefined setpoint pressure via the pressure reducing valve, and the hydraulic drive is configured such that the predefined setpoint pressure is set based on a desired high pressure in the closed hydraulic circuit, the method comprising:

• setting the predefined setpoint pressure to a first high pressure for changing a part of the drill;
• and
• setting the predefined setpoint pressure to a second high pressure for advancing of the drill.