Cat® Track Feller Bunchers are highly productive timber harvesting machines that provide best in class lift capacity, swing torque, and hydraulic performance. Cat offers 7 Track Feller Buncher models available in a wide array of configurations: Zero Tail Swing (ZTS), Full Tail Swing (FTS), Feller Buncher, Harvester, Leveling, and Non-leveling. Various Work Tool options means 500 Series machines can be matched to any job.