PDK Series impact crushers are used as primer crushers in materials such as lime stone, calcite and dolomite where silica and rigidity are low. They have high capacity comparing to jaw primer crushers. Material from the feeder is crushed into two phases by colliding to crushing plates by rotor pallets. Adjustable crushing plates provide the crushed material to be fit into the intended size. The material does not pass into the drip groove unless it is not provided for the desired size.