FX self-propelled forage harvesters from New Holland are the most powerful, highest-capacity chopping machines we’ve ever built. Up to 525 horses strong The FX58 is equipped with a turbocharged, intercooled 525-horse power Caterpillar diesel that delivers unmatched cutting power to harvest crops faster than ever before. The FX38, equipped with a New Holland six-cylinder, turbocharged diesel, produces 414 horsepower while the FX28 puts 346 horsepower to work.