A control system for use on a peanut harvester using a conveyor to elevate and relocate the peanut pods and attached plant material. The control system inputs the ground speed in the direction of travel and the conveyor speed, and outputs to an electronic flow control valve that is part of a hydraulic circuit between a hydraulic motor that drives the conveyor and a connection point that provides hydraulic power to the hydraulic motor. The control system uses an algorithm that compares the ground speed and the conveyor speed and varies the output to the flow control valve so that the conveyor speed is maintained at a defined percentage of ground speed. The defined percentage of ground speed is a user-controlled variable that can be adjusted on the go through the user interface portion of the control system.