Ihe na-ekesa bụ igwe zuru oke na enweghị ihe eletriki ma ọ bụ hydraulic ọ bụla.The kreenu nwere ọrụ nke n'ibu akpaka oghere na mmechi mkpọchi ntụgharị.A na-enye mkpọchi mkpọchi na mkpọchi mmeghe na mmechi na-egosi ngwaọrụ na mgbasa ozi na-achịkwa nke ọma site na ịdọrọ eriri waya.Onye na-arụ ọrụ nke na-adịghị mkpa kreenu na-enyere aka ịgbanye / ihichapụ, na ndị ọrụ ala nwere ike ikpebi ọnọdụ nke ntụgharị na imeghe site na ntụziaka nke pointer.Nrụnye dị mfe ma dị mma, nke na-echekwa oge ntụgharị nke ukwuu site na ebuli nko na-ebuli akpa ahụ.