Abstract: A self-propelled, belt-conveyor type windrow loader is provided with a pair of box members spaced from and parallel to one another, pivotally mounted on the conveyor frame, a fixed torque tube is carried by and extends between the box members at an end thereof near the vehicle, a shaft is rotatably journaled within the fixed torque tube and extends between and into the confines of the box members the axis of rotation of the shaft being displaced from the pivot axis of the box members, upper power train sprockets are mounted on the shaft for rotation therewith, an outer shaft is rotatably journaled in each of the box members, outer power train sprockets are connected to be driven by the upper power train sprockets and mounted within the box members to drive the outer shaft, a rotating cross torque tube is connected to the outer shaft to be driven therewith, the box members totally enclosing the power train elements.