Abstract: A tool bar mounting structure for a self-propelled field sprayer vehicle includes a chassis mount beam for mounting on the chassis of the field sprayer vehicle and two main mount beams pivotably mounted on the chassis mount beam and extending to a position underneath the chassis. A main mount beam lifting mechanism is connected to and extends between the main mount beam and the chassis of the field sprayer vehicle for raising and lowering of the main mount beam. A shock absorber device is mounted on the main mount beam with the upper end thereof connectable to the field sprayer vehicle for generally controlling and limiting vertical movement of the tool bar connection end of the main mount beam. The tool bar connection end is positioned such that when a tool bar is mounted thereon, it is positioned between the front and rear wheels of the field sprayer vehicle.