The 500-Series 511, 521, 522 and 532 track feller bunchers and track harvesters feature zero tail swing and the C9 ACERT engine. Horsepower ranges from 247 to 284; weight, from 53,710 to 69,710 pounds. In feller-buncher configuration, bare pin lift is 15,600 pounds at 20 feet. In harvester configuration, bare pin lift is 9,100 pounds at 29.5 feet. The 552 and 532 have a 3-cylinder leveling mechanism for simultaneous tilting forward and side-to-side.