A meter assembly for a grain drill or seeder or similar implement. The meter assembly is hinged at one end to the implement and held in place by over center latches. To inspect and service the meter assembly and to empty the material containers, the latches are released allowing the meter assembly to swing down. The meter is driven by a pair of gears which automatically disengage when the meter assembly swings away from the latched working position and engage when the assembly is swung back to the working position. Removal and replacement of chains and bolts are eliminated to increase serviceability of the meter assembly.