1. Torque and Speed Matching for Drilling Head Drives The KM1 orbital hydraulic motor series can be selected according to drilling-head load requirements, target speed, and hydraulic system specifications. With displacement options from 36 to 400 ml/r and a catalogue continuous torque range of 68–610 N·m, the series provides multiple configurations for hydraulic drive design. The selected model’s performance data must be checked to verify that its operating pressure and flow