John Deere PowerTech™6090 Series Industrial Diesel Engines encompasses a range of internal combustion engines. This 4 cylinders , 9L engines series have an unparalleled track record for providing hard-working, reliable, and efficient engines that don’t let you down, even in the most extreme conditions. John Deere engines series have proven reliability  to withstand vibration, extreme temperatures and dust. The 6090 Engines series include the diesel engines: 6090HFU20,6090HFU55,6090HF475