... rock. Other type: YN27A,YN28,YN30A,YN30W YN27 diesel rock drill for coal Instruction of YN27C YN27C Rock Drillis is a ... very efficient machine, composed of gasoline engine, Air pump, rock drill. It adapt to these outside situations without water and electronic ... power. Meanwhile it is a hand- held drill, during operation, rock power is blown away by the compressed ...