Iikhreyini zebhulorho, ezikwabizwa ngokuba ziikhrayini ezingaphezulu, zisetyenziswa kakhulu kumashishini ahlukeneyo okunyusa nokuhambisa imithwalo enzima. Amagama amabini abalulekileyo anxulumene neekhreyini zebhulorho bubude begumbi lentloko kunye nokuphakama kokuphakama.
Ubude begumbi lentloko yekhrane yebhulorho bubhekiselele kumgama ophakathi komgangatho kunye nomzantsi webhulorho yebhulorho. Lo mlinganiso ubalulekile njengoko umisela ubungakanani bendawo efunekayo ekusebenzeni kwekhreyini, kuthathelwa ingqalelo nayiphi na imiqobo, efana nemigudu, imibhobho, iitrasi zophahla okanye izibane zokukhanyisa, ezinokuthintela ukuhamba kwayo. Ukuphakama kwegumbi lentloko ngokuqhelekileyo kunokwenziwa ngokwezifiso, kwaye abathengi banokucacisa iimfuno zabo ngokuxhomekeke kwimithintelo yendawo yendawo yabo.
Kwelinye icala, umphakamo wokuphakama wekhreyini yebhulorho ubhekiselele kumgama apho ikhreyini inokuphakamisa umthwalo, ulinganiswe ukusuka kumgangatho wekhreyini ukuya kweyona ndawo iphakamileyo yokunyuswa. Lo mphakamo yingqwalasela ebalulekileyo, ngakumbi xa utshintshela izixhobo okanye iimveliso kumaziko amanqanaba amaninzi, apho umgama ophakamileyo wokunyuswa kwekhreyini udlala indima ephambili ekumiseleni inani lemigangatho ekufuneka ilifti ihambe.
Kubalulekile ukuqonda umahluko phakathi kobude be-headroom kunye nokuphakama kwe-headroomiikhreyini zebhulorho, njengoko bekuya kunceda ekukhetheni nasekuyileni izixhobo ezifanelene kakuhle nendawo yokusebenzela yomthengi kunye neemfuno.
Umphakamo wokuphakama udlala indima ebalulekileyo ekumiseleni umthamo wekhreyini ukuthutha iimpahla ukuya kumphakamo othile. Ukuphakama kokuphakama kwe-crane kufuneka kukhethwe ngononophelo, kwaye kuxhomekeke kuhlobo lomthwalo kunye nokuma kwendawo kunye nobukhulu. Kubalulekile ukwenza ukhetho olufanelekileyo ngelixa uqwalasela ukuphakama kokuphakama, njengoko kunokuchaphazela ukusebenza kakuhle kunye nemveliso yecrane.
Ukuqukumbela, xa kufikwa kwiikhreyini zebhulorho, ukuphakama kwe-headroom kunye nokuphakama kokuphakama zizinto ezimbini eziphambili ekufuneka ziqwalaselwe. Ukuvavanya ngokufanelekileyo kunye nokugqiba kwezi zinto kunokunceda ukwandisa ukusebenza kwe-crane yebhulorho, ukunciphisa ixesha lokuphumla, kunye nokuqinisekisa ukhuseleko kwiziko.
