Add some crushed stones! Our model of a primary crusher features two conveyor belts allowing for separate, temporary storage of gravel of different grain-sizes. Dump trucks transport the blast off stones to the crushers? chute. The jaw crusher then crushes and mills the stones. Afterwards, a conveyor belt transports the material directly into the stone breaking works (art. 130170). At the same time, the swing conveyor belt distributes the different grain-sizes onto stockpiles so that wheel loaders can load the gravel on trucks. The kit also includes the necessary drive parts for swinging the conveyor belt so that you can easily attach a servo (art. 180726).