求翻译：6、 升降故障应检查节流阀是否调正、堵塞、有关漏油，压力是否太低，切记节流阀不可调整太快，升降时上升速速度一定要缓慢。是什么意思？

6, lift failure should check that the throttle valve is adjustable, blockage, about oil spills, the pressure is too low, remember to throttle valve is not adjusted too fast, lifting speed-increase speed must be slow.