In this video is shown the maneuver to retype the ball of the valve EVD in case the leak is due to its malfunction. The sealing ball of the down travel valve can remain lightly open and loose oil for different reasons: - Small metal particles or dirt lay inside the coil, between quill and cursor, delaying or preventing the return movement of the coil cursor. - The coil EVD button has got mechanically caught, after having been activated manually with a screwdriver. The coil cursor can not get back to its motionless position. - Some metal particles lay between ball and sealing seat, preventing the closing or damaging the sealing seat. If the problem persists or if you have any further doubts, please contact the technical support service, open the ticket by sending an email to service@omarlift.eu specifying the order code on all Omarlift components