Deere & Co. unfairly forces farmers to visit authorized dealers to repair their equipment, resulting in higher prices than if they could fix it themselves or get help from independent shops, the Federal Trade Commission claims in a federal lawsuit filed Wednesday with the attorneys general of Illinois and Minnesota.

John Deere’s “unfair” practices raised repair costs for farmers and kept them from being able to make repairs on tractors and other equipment they own, the Federal Trade Commission (FTC) alleges in a new lawsuit.

The lawsuit comes after years of the equipment manufacturer locking farmers out of making basic repairs to their equipment.