HD325 series is a range of fully hydraulic multi-purpose foundation crawler drilling rigs with a foldable drill mast which allows transportation without separating the plant into shorter sections and reduces the time for setup and dismantling. The high pull-back force on the drill mast, together with the high-torque rotator providing up to 120,000Nm of torque, is especially designed and built for heavy-duty drilling. The "Power On Demand Electro - Hydraulic System" links the engine power-output closely to the hydraulic power requirement to optimise fuel consumption.