Patent ID: 8733257

Claim:
A remotely controlled lid apparatus for a fill opening on a product tank of an air seeder, the apparatus comprising: a lid movably attached to the product tank adjacent to the fill opening such that the lid can move from an open position, where the fill opening is open for filling the product tank, to a closed position where the lid covers the fill opening; a seal operative to provide a seal between the lid and edges of the fill opening a hydraulic cylinder operative to move the lid between the closed position and the open position, and operative to exert a downward force on the lid against the seal when the lid is in the closed position; wherein the hydraulic cylinder is connected to a pressurized hydraulic fluid source of the air seeder so that the hydraulic cylinder pushes down on the lid with a force proportional to a pressure of the hydraulic fluid in the pressurized hydraulic fluid source, and pressure control is operative to vary the pressure of the hydraulic fluid in the pressurized hydraulic fluid source.