Technical Parameter Model: 400C Max. drill depth: 250m Drill diameter:110-325 mm Diesel Engine: 93 KW (Cummins) Working air pressure:1.05-2.46 MPa Air consumption:16-34 m3/min Drill rod length: 3m Drill rod diameter: 89mm/76mm Axial pressure: 5t Lifting force: 12t Slow lifting speed: 4m/min Fast lifting speed: 14.5m/min Slow feed speed: 6.2m/min Fast feed speed: 25m/min