Abstract: A field cultivator frame has a number of generally horizontal implement frame sections, each frame section having ground engaging wheels for movable support over the ground. First and second center frame sections are pivotally connected to a prime mover by a hinged draw bar assembly. Front ends of the center frame sections are pivotally connected by a flex link assembly including a connecting bar with ball joint connections at either end. The flex link assembly allows vertical movement of the center frame sections relative to one another, which movement is limited by a plate assembly attached to one of the center frame sections. A swivel joint assembly connects rear parts of the first and second center frame sections for allowing hinged movement of the frame sections relative to one another. A spring-loaded limit assembly connects the first and second center frame sections and includes compression springs for resilient limiting of relative movement of the center frame sections.