... roadway, CMJ17J coal tunneling with hydraulic drillApplicable scope: CMJ17J coal tunneling with hydraulic drill car applies to coal, ... 3, Caterpillar itself, flexible, crawling ability.4,In determining the arms, hydraulic rock face any position, accurate positioning, Construction ... drilling speed.7,Power, low energy consumption.8,Hydraulic system is advanced, pipeline layout is reasonable and easy ...