A good macerator is essential to make sure the injector works properly because some kinds of slurry (especially cattle slurry) are full of fibres and foreign bodies. Now, a blocked opening means the spreading pattern will be uneven and the user will have to stop working. The solution is the patented JOSKIN SCALPER©system: an extremely efficient macerator made up of 8 self-sharpening circular blades turning freely and driven by a hydraulic motor. The circular blades and the elliptical arched and off-centre openings of the blade holder inevitably cut all foreign bodies in the slurry.

When the blades strike against too hard obstacles, the rotation direction of the SCALPER© is reversed by the "Switch-Matic" system (option) until the obstacle is chopped. Moreover, an electric reverser with manual control in the cabin is installed on all rear implements fitted with an automaton.

A multi-position manual valve, fixed at the macerator inlet, allows a step by step adjustment of the slurry injection. The precise adjustment is carried out by means of the pressure relief valve and the chosen model of counterblade. 3 types are proposed: flow from 7 to 20 m³/ha, from 12 to 30 m³/ha or from 25 to 50 m³/ha. A double feeding of the macerator is also possible for a higher flow.

The hydraulic circuit is isolated thanks to a cap. A drain makes it possible to check whether the water seal is faulty. The JOSKIN SCALPER© macerators are also sold separately in order to equip existing injectors.