The John Deere 9870 STS Combine is a powerful and efficient machine that has revolutionized the farming industry. With its advanced technology and impressive capabilities, this combine has become a favorite among farmers looking to increase their productivity during harvest season. This blog will look at the features and specs of the 9870 STS combine and why it has become a popular choice for farmers worldwide.

What is the John Deere 9870?

The John Deere 9870 STS combine is a tough harvesting combine made for big farms. It’s great at harvesting crops like wheat, corn, soybeans, and grains. The John Deere 9870 features GPS guidance, yield mapping, and automatic controls for top-notch performance. With a big grain tank and cutting width, it’s a popular choice for farmers wanting to get the most out of their harvest season.

As an innovator in the farming equipment industry, John Deere continues to find ways to improve the efficiency of heavy machines. John Deere combines are continually upgraded with the goal of creating the finest and most efficient equipment on the planet. The results are durable machines that harvest more crops in less time.

What Class is a John Deere 9870?

The John Deere 9870 is classified as a Class VIII combine, which is the largest class of combines available. This powerful machine has a capacity of 350 bushels, making it ideal for large-scale farming operations. With its advanced technology and robust design, the John Deere 9870 is a popular choice among farmers who need a high-capacity combine to harvest their crops efficiently.

What Years Did John Deere Make the 9870 STS Combine?

The John Deere 9870 STS Combine was produced between 2008 and 2012. During these years, John Deere manufactured this model to provide farmers with a powerful and efficient machine for harvesting crops. The 9870 STS Combine was known for its advanced technology, high-capacity threshing system, and ease of use, making it a popular choice among farmers during its production years.

How Much Horsepower Does a John Deere 9870 STS Have?

The John Deere 9870 STS combine is among the finest harvesting combines on the market today. Its 440 horsepower Power Tech™ engine offers exceptional torque, enabling it to handle the harshest conditions.

What Are the Key Features of the John Deere 9870 Combine?

This series of John Deere combines and is equipped with some of the latest John Deere technologies. The JD 9870 STS combine is a master at concurring rugged terrain and sloping hills. This machine truly makes the hardest jobs seem easy. Let’s check some of the features below:

Precise Threshing Tool

With legendary engineering, John Deere has created a precise threshing tool that automatically adjusts itself to find the height of your crop. The John Deere 9870 combine can also harvest side hills at a slope of 14° without scraping or damaging equipment.

Premier Cab

The JD 9870 combine cab is large and highly functional. With well-labeled controls, the vehicle operator can feel comfortable finding every tool they need when harvesting. John Deere has also created a cab that is conducive to multitasking by allowing operators to accomplish office work. This spacious work environment helps farmers get the most out of their working hours.

Harvest Form™

With over 100 years of engineering experience, John Deere continues to create agricultural equipment built to last. With products like Harvest Form™ that contribute to the durable exteriors of John Deere combines, owners can feel confident that their equipment can handle heavy moisture without rusting.

What Are the Key Specs of the John Deere 9870 STS Combine?

Let’s take a closer look at some of the key specifications of a 9870 STS combine.

Cleaning System

  • Cleaning Fan Speed – High – 1250 rpm
  • Cleaning Fan Speed – Low – 620 rpm
  • Total Cleaning Area – 8137.6 cu in


  • Displacement – 823.9 cu in
  • Number of Cylinders – 6
  • Power – 440 hp (328 kW)
  • Power Boost Power – 471 hp (351 kW)
  • Power Measured @ – 2200 rpm


  • Conveyor Length – 68 in
  • Conveyor Width – 55 in

Grain Handling

  • Grain Tank Capacity – 300.9 bu
  • Unloading Auger Length – 22.5 ft
  • Unloading Discharge Height – 14.4 ft
  • Unloading Speed – 3.3 bu/sec

Operating Specifications

  • Fuel Capacity –  305.2 gal
  • Operating Weight w/o Attachment – 36114 lbs


  • Discharge Grate Area – 1705.1 cu in
  • Separating Area – 2387.1 cu in
  • Separator Type  – Rotary


  • Concave Area – 1705.1 cu in
  • Rotor Diameter – 29.6 in
  • Rotor Length – 123.3 in
  • Rotor Speed – High – 1000 rpm
  • Rotor Speed – Low – 210 rpm 

Maximize Your Field Performance with John Deere 9870 STS Combine

John Deere combines are continually improved to become more precise and efficient. They are known for accurate harvesting, reducing fuel costs and time spent in the field. By creating efficient equipment, farmers also spend less time making double passes and save money on labor expenses.

Check out the other John Deere STS combines below, and to learn more about which combine is right for your operational needs, visit your local John Deere dealer.

Check out our inventory of used combines

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