A method and system of a pneumatic conveying system for moving separated grain and small plant material to an onboard storage tank or out of the combine harvester. The pneumatic conveying system having a gateway for introducing the material into an air flow channel, and with a diverter valve or an airlock directing separated grain and small plant material to the tank or outside of the harvester.

The present invention relates to a method and system of conveying harvested material within or out of a combine harvester using positive air pressure. The invention provides for a lighter, simpler process of material handling by using positive air pressure to pneumatically convey harvested material. As compared to conventional methods, the present invention incorporates lighter weight components and fewer moving parts. Systems of the present invention have more flexible layouts than conventional methods, which allows for the incorporation of different material types, easier cleaning, and potentially greater ease for process automation.