Isebenzisa injini yedizili eqinisiwe, iyakwazi ukuzivumelanisa kahle nezindawo eziphakeme kakhulu kanye namakhono okuqala okushisa okuphansi, okwenza kube nokusebenza okuzinzile ezindaweni ezinzima njengezindawo eziphakeme kakhulu kanye namazinga okushisa aphansi, okuqinisekisa inqubekela phambili yokwakha ezimweni ezikhethekile zezwe.
Injini kadizili, enokushayela kwayo ngqo noma ukusebenza kahle kokudlulisa okuphezulu, ingahlinzeka ngokukhishwa komoya ocindezelwe okuqhubekayo okunamandla amakhulu, okuphakathi kuya phezulu, okuhlangabezana nezidingo zamandla zemishini esebenzisa umoya oqinile njengemishini yokubhoboza phansi, ama-hydraulic breaker, kanye nezinhlelo zokususa isihlabathi/ukugqwala.