In line with its objective of constant improvement, NACE always pays attention to there quests and recommendations of its customers regarding the operation of its products. Based on this approach, NACE has brought a set of new innovations to its rotor design in 2016. These significant changes have rendered the maintenance of Primary Impact Crushers easier, and also extended their service life. These crushers are produced as fixed machines or as mobile machines on semi-trailers. Over 15 years of research and development studies on the field have allowed our Primary Impact Crushers to achieve the best performance. They are Heavy Duty Type Crushers capable of performing multiple simultaneous functions. Primary Impact Crushers not only break moderately hard and non-abrasive limestone and other similar materials with high performance, but also allow the size of first stage products to be checked. Their maintenance and use are extremely simple. The output size of the product, as well as the distance between the rotor and the pendulum that bears the crushing plates, can be easily adjusted with the aid  of a hydraulic mechanism. The crusher consists of two parts, and the upper part can be completely opened with the use of the hydrauliccylinders, allowing for easy maintenance. Thanks to minimum stopping times, the pallets, plates and frames of the machine can be rapidly replaced.