The John Deere 8420 tractor was first introduced in 2004 and was the first tractor in John Deere’s 8R series. It has a four-cylinder, 6.8-liter engine that produces a maximum power output of 180 horsepower. This powerful tractor has a top speed of 23.7 miles per hour, and is designed to handle a range of applications, including pulling heavy implements, transporting materials, and operating grain harvesting equipment. The 8420 also comes with an advanced AutoTrac guidance system that makes it easy to navigate through tight spaces and difficult terrain. With its large range of features, the John Deere 8420 tractor is well-suited for farmers and ranchers who need a reliable and powerful workhorse.