Ejiri motootu mgbanaka cranes underhungma ọ bụ n'okpuru kreenu na-agba ọsọ bụ otu ụdị nke otu girder n'elu crane na-eme njem. A na-ejikọkarị eriri egwu nke crane àkwà mmiri dị n'okpuru ma na-akwado usoro nkwado ụlọ, na-ewepụ mkpa maka ogidi ala ọzọ iji kwado egwu ndị ahụ. N'ụzọ dị otú a, kreenu àkwà mmiri a na-ejighị n'aka nwere uru ma ọ bụrụ na ohere ala na ihe a chọrọ iji belata ihe mgbochi ala bụ okwu n'ala ụlọ mmepụta ihe ma ọ bụ ụlọ nkwakọba ihe. Otu crane n'okpuru mkpuchi mkpuchi nwere ike ịbụ ezigbo ihe ngwọta maka ụlọ ọrụ nwere elu elu mkpọda ma ọ bụ ọtụtụ usoro kreen.
Otu n'úkwù n'okpuru cranesa na-ejikarị eme ihe maka njikwa ihe dị mfe, nwere ikike ibu nke tọn 10 ma ọ bụ ihe na-erughị ya. Emebere cranes anyị na-adịghị mma iji melite nchekwa crane ma belata oge okirikiri ibu n'oge mmepụta ogbako.
Kreenị monorail Underhung maka ọrịrena nnukwu akwa akwa ọnụ ahịa kreenu. Igwe na-ere otu ihe na-ekpo ọkụ na-ere ọkụ gụnyere 1 ton underslung crane, 2 ton underslung crane, 3 ton underslung crane, 5 ton underslung crane, 10 ton underslung crane, na ndị ọzọ. Craft single girder underslung crane aghụghọ dị iji zute ngwa gị akọwapụtara na ihe ebuli elu chọrọ.
Nkeotu girder underslung kreenubụ ihe ọkụ ọkụ na-edozi kreenu nke a na-agbanye n'elu ụlọ nke ebe ọrụ na-enweghị ogidi ala, na-echekwa ohere na ibelata ọnụ ahịa. Atụmatụ izugbe nke kreenu akwa akwa otu na-enweghị isi bụ ndị a:
Ogo na-agbanwe agbanwe, arụmọrụ a pụrụ ịdabere na ya na nke kwụsiri ike, yana uru nke imepụta crane akwa akwa.
Oghere ụgbọ ala/ọgwụgwụ na-anabata nhazi nhazi kachasị mma.
The isiike doo ma ọ bụ welded igbe Ọdịdị crane doo na-enyere ezigbo ibu nkesa.
Enwere ike ịhazi nhazi crane usoro na ngwa gị iji jide ibu dị nso na mgbidi ụlọ.
Ụgbọ ala monorail dị n'okpurunwere ike jikọọ na ụlọ elu ụlọ na-enweghị ogidi, si otú ahụ na-eme ka ojiji nke ala ohere
Nhazi kreenu akwa akwa otu dị fechaa nwere ikike ibu ihe dịka tọn 10 ma ọ bụ obere.
