By Katie Weiler, Managing Editor | September 28, 2010

CaterpillarTwo feller-bunchers, Models 533 and 543, can be fitted with either the Cat HF221 or HF222 felling head, or with the HS20 shear head. Both machines are powered with a Cat 3126 DITA six-cylinder engine. The 533, with 204 gross horsepower, has an operating weight of 28,535 pounds; and the 30,660-pound 543 is rated at 225 gross horsepower. They both have hydrostatic drive and a load-sensing hydraulic system with a variable-displacement pump.