... ,Welding construction 3,Integraltype cylinder 4,Inner safety valve 5,Double seal for the pump YRD17-High- ... pump toprevent the oil leak 5.Inner safety valve prevent the user to adjust the systemHow to ... location of car under body.5) After closing the release valve, lift the car body up by operating ... up and down.6) When a release valve is slowly release valve is slowly released while holding lever firm ...