The efficient, powerful and compact hydraulic power units of the HS series are specially designed to meet the requirements of auger drilling rigs. Their simple handling, the modern, power-controlled and durable drive technology guarantee smooth operation of the machines. All units in the HS series are soundproofed and comply with the applicable emission limits (US, EU) and safety standards. The electric hydraulic units in particular define a new ecological standard – almost emission-free (exhaust gases, noise). The diesel or electric power units of the HS series for the Midi and Maxi auger drilling rigs have a 3 or 4-circuit hydraulic system. This provides the user with the highest performance in thrust, pull, speed and torque in all drilling situations. The 3rd or 4th circuit is provided for the operation of a bentonite mixing and pumping station, the entire operation is carried out via only one hydraulic unit.