rock shaft lift arm
/ˈɹɒk ˈʃaft ˈlɪft ˈɑːm/
n
English · rock shaft lift arm中文 · 提升臂Español · brazo de elevación del árbol oscilanteFrançais · bras de relevage
意味：Part controlled by the hydraulic cylinder that raises and lowers a tool by means of the lifting link and the draft link.