Abstract: Silage distributor apparatus has an upper annular stationary member disposed about a flowing silage stream, a silage distributing chute, and a lower annular member rotatably mounted to the upper annular member for disposing the chute in the path of the flowing silage stream. A drive track in the form of a row of apertures is defined on the lower annular member and a drive sprocket is rotatably mounted on the upper annular member and disposed in driving relation with the drive track. A drive motor is removably mounted on the upper annular member and has a rotary output shaft which when the motor is mounted on the upper member is drivingly interengaged with the drive sprocket and when the motor is dismounted therefrom becomes disengaged from the drive sprocket. A sensor is connected to the motor for removal with it and has a contact finger disposed across the path of a row of pins projecting from the lower annular member.