Caterpillar's 541, 551 and 552 track feller bunchers and track harvesters feature a 305-gross-hp C9 ACERT engine. The 552 has a 3-cylinder leveling mechanism that provides simultaneous tilting forward and side-to-side. According to Cat, the machines have industry-leading lift capacities. In feller-buncher configuration, bare pin lift is 21,800 pounds at 21.5 feet. In harvester configuration, bare pin lift is 9,500 pounds at 35 feet.