An observation has been conducted to find weakness on jaw crusher made by Nagreg residents. This equipment was tested using limestone and granite rocks as the feed. The equipment has several weakness which can be modified such as jaw position, jaw surface, the unavailability of hopper in the upper mouth opening, and track for the belt, and equipment construction is also rather weak. It is suggested that the equipment should be built in knock down system in facilitating the equipment transportation. With respect to the large blasting product, there is a possibility to develop this equipment into primary and secondary crusher.