John Deere has made plenty of big machinery in the past, but this one is the green-and-yellow’s largest ever. It’s called the 9RX 830, and thanks to its 18-liter turbodiesel engine, it’s also the most ...

This John Deere 830 diesel, which belonged to a Littlestown, Pa., collector, sold for $15,500 on Oct. 4. The online auction also featured more than 20 other John Deere tractors, a few Farmall and ...