The first John Deere X9 series combines were ready for the 2020 harvest season. The brand's top model, manufactured in the USA, featured two 610-millimeter cylinders, whereas the S series had one 760-millimeter cylinder. The cylinders rotated eccentrically within their threshing chambers. There were two models: 1000 and 1100. They differed in engine power, grain tank capacity, and unloading speed. The smaller model's maximum power was 639 hp, and the larger one with two turbochargers produced 700 hp. The tanks had capacities of 14,800 and 16,200 liters respectively, with unloading speeds of 162 and 186 liters per second. The headers were draper types measuring from 9.15 to 15.2 meters. In addition to a 10-degree side tilt, it was also possible to lower both edges below the center point. The stepless drivetrain was robust, consisting of two pumps and four motors, with maximum torque at a speed of 8 km/h.

The four-chain grain elevator, at 172 cm wide, was the largest on the market. The chopper's patented, serrated blades were novel in design and self-sharpening. The cab (72.8 dB) was new and larger than before, but the control armrest and steering lever were similar to those in the S700 series. In the most expensive Ultimate package, the cab included, among other things, a leather seat and steering wheel, carpet, electrically closing cab door, seat heating, cooling and massage, and a refrigerator. Several packages were also available for the threshing automation and cloud services. The 1250-liter fuel tank could be optionally equipped with a fast-fill feature, allowing filling at a rate of 550 liters per minute. The X9 was marketed as a tracked version, but a wheeled version was also available. The sieving system had a standard 7-degree tilt and an optional 14-degree tilt.

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