Feem ntau daim ntawv thov lub cev muaj zog yuav tau nruab nrog cov khoom siv overload, uas yog, thaum lub cev muaj zog tam sim no tshaj li qhov tsim nyog vim yog overload, cov lus qhia tuav yuav raug coj los siv kev tiv thaiv.
Thaum lub cev muaj zog yog mechanically daig, los yog muaj hluav taws xob tsis zoo xws li hauv av, theem-rau-theem, thiab tig-rau-tig, cov lus qhia kev tiv thaiv kuj yuav siv tau vim qhov nce ntawm tam sim no. Txawm li cas los xij, thaum qhov tam sim no tsis tau nce mus rau qhov chaw tiv thaiv tus nqi, cov cuab yeej tiv thaiv yuav tsis ua raws li cov lus qhia sib xws.