A stump cutter comprising: a boom-mounted cutter wheel rotatable about a cutter wheel axis (E), wherein the cutter wheel is supported by a boom for sweep movements about a vertical cutter wheel sweep axis (A) so that the cutter wheel sweeps along an arcuate path within a horizontal plane, and wherein the cutter wheel is supported by the boom for tilt movements about a horizontal cutter wheel tilt axis (F) so that the cutter wheel tilts along an arcuate path within a vertical plane; a prime mover configured to drive the cutter wheel about the cutter wheel axis (E), wherein the prime mover is supported on a mainframe of the stump cutter and does not move with the boom ; and a mechanical driveline configured to provide power transmission from the prime mover to the cutter wheel , the mechanical driveline including a final drive cutter wheel gearbox positioned along the cutter wheel axis (E), a swivel gearbox assembly including two right angle gearboxes joined with a swivel joint therebetween, wherein the swivel joint between the two right angle gearboxes forms a driveline swivel axis (C), and an input shaft of an upstream one of the two right angle gearboxes , the input shaft defining an axis (A) fixed with respect to the mainframe and the prime mover , wherein a downstream one of the two right angle gearboxes includes an output shaft connected to an input shaft of the final drive cutter wheel gearbox . a boom-mounted cutter wheel rotatable about a cutter wheel axis (E), wherein the cutter wheel is supported by a boom for sweep movements about a vertical cutter wheel sweep axis (A) so that the cutter wheel sweeps along an arcuate path within a horizontal plane, and wherein the cutter wheel is supported by the boom for tilt movements about a horizontal cutter wheel tilt axis (F) so that the cutter wheel tilts along an arcuate path within a vertical plane; a prime mover configured to drive the cutter wheel about the cutter wheel axis (E), wherein the prime mover is supported on a mainframe of the stump cutter and does not move with the boom ; and a mechanical driveline configured to provide power transmission from the prime mover to the cutter wheel , the mechanical driveline including a final drive cutter wheel gearbox positioned along the cutter wheel axis (E), a swivel gearbox assembly including two right angle gearboxes joined with a swivel joint therebetween, wherein the swivel joint between the two right angle gearboxes forms a driveline swivel axis (C), and an input shaft of an upstream one of the two right angle gearboxes , the input shaft defining an axis (A) fixed with respect to the mainframe and the prime mover , wherein a downstream one of the two right angle gearboxes includes an output shaft connected to an input shaft of the final drive cutter wheel gearbox . a final drive cutter wheel gearbox positioned along the cutter wheel axis (E), a swivel gearbox assembly including two right angle gearboxes joined with a swivel joint therebetween, wherein the swivel joint between the two right angle gearboxes forms a driveline swivel axis (C), and an input shaft of an upstream one of the two right angle gearboxes , the input shaft defining an axis (A) fixed with respect to the mainframe and the prime mover , wherein a downstream one of the two right angle gearboxes includes an output shaft connected to an input shaft of the final drive cutter wheel gearbox . <EOS>