Crawler drilling rig 1:Cummins Engine 2:high drilling efficiency 3:ISO Certificated drilling rig 4:drilling depth:40-200m DTH Drilling rigINTRODUCTIONHD300 crawler deep hole diameter adopts diesel motor,hudraulic oil pump unit offers power to hydraulic motor moving,turn-ground,propulsion and lifting,and angle orientation of oil cylinder,etc.When the drill is working,only the down the hole hammer ...