Kev siv fais fab yog ib yam tshwj xeeb nqa khoom, nruab rau hauv cov crane, txoj kev siv fais fab, fais fab fais fab muaj qhov zoo ntawm qhov me me, lub cev nyhav, yooj yim lag luam, siv yooj yim, siv cov chaw lag luam thiab cov chaw lag luam, cov chaw cia khoom thiab lwm qhov chaw.

Lub fais fab fais fab yog kev cog lus, thiab fais fab fais fab mus rau lub nruag ntawm lub nruas txais kev pabcuam cab. Lub disadvantage ntawm loj loj: ntev, dav ntawm loj loj, loj mechanical qauv, tsawg efficiency, nyuaj ua. Hydraulic system yog dual tswj, thiab puv regulating valve thiab sib nqus sib chwv siab gauge yuav tswj lub siab tseeb. Lub tuam tsev tswj hwm hluav taws xob siv hluav taws xob tsawg los tswj kev ruaj ntseg ntawm cov kev tswj kav.