underground drilling rig 1,hydraulic system 2,crawler type 3,city construction rig ... 40 directional drilling rig is driven with full hydraulic system, propelled with its own crawlers. Driven with duplex ... with an advanced and compact structure; adopting chain feeding system driven by motor, the motor could move stably ... be adjusted for the angle of drilling holes from 8°to 22°. The overall unit is in low ...