UJack umisisiqwenga esiqinileyo sokujika njengesixhobo esisebenzayo, ngokusebenzisa isibiyeli esiphezulu okanye uzipho lwesibiyeli esisezantsi ngaphakathi kohambo oluncinci ukuvula ubunzima bezixhobo zokuphakamisa ezincinci ezilula. I-Jack isetyenziswa kakhulu kwiifektri, kwimigodi, kwezothutho nakwamanye amasebe njengokulungisa izithuthi kunye neminye imisebenzi yokuphakamisa, inkxaso kunye neminye. Ulwakhiwo lwayo lulula kwaye luqinile, luguquguquka kwaye luthembekile, kwaye lunokuthwalwa kwaye luqhutywe ngumntu omnye.Ibhalansi yamatayara isetyenziselwa ukulinganisa ukungalingani kwerotor, umatshini wokulinganisela ungowomatshini wokulinganisela oxhaswa nzima, ukuqina kwefreyimu yokujika kukhulu kakhulu, ukungalingani kwerotor kulungiswa ziziphumo zokulinganisa umatshini wokulinganisa onamandla, ukuze kuncitshiswe ukungcangcazela, kuphuculwe ukusebenza kwaye kuphuculwe umgangatho wemveliso, ukungcangcazela kwerotor okanye ukungcangcazela okusebenza kwibheri kunokuncitshiswa kuluhlu oluvumelekileyo. I-Gantry crane yinguquko ye-bridge crane, eyaziwa ngokuba yiikreni yevenkile egoqekayo.Isetyenziswa kakhulu ekulayisheni nasekukhupheni impahla ebaleni langaphandle, ebaleni lezinto eziphathekayo nakwimithwalo emikhulu. I-Gantry crane isetyenziswa kakhulu kwiindawo zokubeka imithwalo ngenxa yesantya sayo esiphezulu sokusetyenziswa, uluhlu olukhulu lokusebenza, ukukwazi ukuziqhelanisa nokuguquguquka okukhulu.