8. Txhawm rau tiv thaiv cov khoom siv kev puas tsuaj los ntawm overload, muaj ib qho kev cuam tshuam tsis siv neeg unloading valve nyob rau hauv lub hydraulic ntaus ntawv. Thaum cov khoom rub tawm ntau tshaj qhov rated load, lub overload valve yuav cia li tsis tiv thaiv, thiab ib qho juler hydraulic nrog lub tonnage loj yog siv xwb.