... for example : more motor , stronger gradeability ,more reasonable drilling angle , faster rotation and propulsion speed and so on . Its horse ... swing angleLeft100°,right45°,total 145°Drill boom pitch angleBlow 50°,elevation25°, total 75°Drill boom pitch swing angleLeft44°, right45 ... diesel 1700r/min)107r/min(diesel2200r/min)55r/minImprove 50%Feeding speed450mm/s336mm/sImprove 33% KG920A-M1321 Rotary ...