A self-propelled filling pipe for a liquid manure spreader has a frame, anelongatedpipe on the frame having a lower inlet end and an elevated outlet end, atleast two wheelsmounted on the frame, a caster wheel mounted on the elongated pipe proximatethe lowerinlet end and a fluid drive system. The fluid drive system includes ahydraulic pump, a firsthydraulic circuit connecting the hydraulic pump to a plurality of hydraulicmotors drivinglyconnected to the wheels. The fluid drive system also includes a secondhydraulic circuitconnecting the hydraulic pump to a hydraulic motor operatively connected tothe casterwheel. A prime mover provides power to the hydraulic pump to power thehydraulic motorsto rotate the caster wheel thereby steering the filling pipe and/or to drivethe wheels therebypropelling the filling pipe on the ground.
