This socket-head cap screw secures the mounting interface between the drive assembly and the frame on a self-propelled forage harvester. It passes through the flange of the driven component and threads into the tapped hole of the supporting bracket, clamping the two parts together under preload. A loose or missing bolt in this position allows relative movement between the components, which can misalign the belt or chain drive and accelerate wear on the pulleys and bearings. On reinstallation, clean the threads and the mating faces, then tighten the bolt to the torque value specified for the joint.