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This model is equipped with a dual motor rotary head and a multi way valve with adjustable rotary speed, and the rotary torque can reach 2200N. m, meeting the requirements of 76 drill pipes and 130 hole diameters. The maximum rotation speed can reach 150 revolutions, meeting the needs of some customers for high-speed drilling in soft rock formations. At the same time, the 420 series models are equipped with engineering track and plunger motors as standard, adding leveling functions and improving the equipment's off-road climbing performance. It can adapt to complex terrain conditions and can drill vertical holes for slopes to meet different working conditions.