The Vortex Stump Grinder features a high torque output radial piston motor. It converts close to 95% of the hydraulic energy into horsepower – getting the most out of your host machine. The direct drive system uses an oil bath enclosed hub, meaning there are no external zerks and nothing to grease. A high strength steel wheel provides great visibility and an aggressive bite. It features replaceable teeth, rock guards, and abrasion resistant wear plates.