John Deere 7420 Price, Reviews, Specs, Engine Oil Capacity, Weight, Serial Numbers, Attachments, History, Features & Pictures John Deere 7420 Row-Crop Tractor is equipped with a John Deere PowerTech 6068HF475 turbocharged diesel 6-cylinder liquid-cooled engine, which delivers 135 hp (100.7 kW) power at rated rpm 2100. John Deere 7420 Row-Crop Tractor featured with a John … [Read more...] about John Deere 7420 HP, Price, Specs, Weight, Reviews