Customized wireless remote control for simple manual elevator, hydraulic cargo elevator, electric elevator

Has the hydraulic oil been used for a long time and has not been replaced. After a period of time, the wear resistance of wear-resistant hydraulic oil will decrease, which can also lead to insufficient working pressure. Please replace it with a new hydraulic oil.. Simple manual elevator, hydraulic elevator, cargo elevator, electric elevator, wireless remote controller, customized household elevator, elevator control system, elevator standard, direct sales