 Nime ngwá ọrụ na-emegharị ihe na ngwa ngwa, mkpọtụ, mkpọtụ mgbapụta kachasị mma, ngwa, kọmpụta na mgbanwe iji mee ka obodo ahụ dịkwuo mma netiti mkpochapu ihe mkpofu, mkpofu nke mkpofu dị irè, nke kwesịrị ekwesị maka ụzụ nke diesel engine, ntọhapụ usoro nke hydraulic a na-achịkwa nke na-achịkwa iji kpochapụ ọrụ gbawara ebe ngbochi ahụ, nyochaa ngwaọrụ iji melite arụmọrụ nke ukwuu. 