Production years
2008-2012
John Deere combine ยท 2008-2012
John Deere 9870 STS Combine
The John Deere 9870 STS is the flagship Class 7 machine of Deere's 70 Series STS combines. With 440 hp, a 300-bushel tank, and a high-capacity single rotor, it earned a reputation as a powerful, productive late-generation STS combine.
Threshing system
STS single-rotor, axial-flow rotary separation
Engine
John Deere 6135 13.5 L six-cylinder diesel, 440 hp
Grain tank capacity
300 bu
John Deere 9870 STS specifications
| Production years | 2008-2012 |
|---|---|
| Threshing system | STS single-rotor, axial-flow rotary separation |
| Engine | John Deere 6135 13.5 L six-cylinder diesel, 440 hp |
| Grain tank capacity | 300 bu |
| Header compatibility | John Deere 600 Series grain, draper, corn, and pickup headers; 30-40 ft platforms commonly used |
| Weight | Approx. 36,114 lb, 2WD without header |
| Transmission | ProDrive hydrostatic drive, commonly equipped |
| Feederhouse | High-capacity feederhouse with reverser; Contour-Master available |
What the 9870 STS is used for
The 9870 STS was built for large-acreage corn, soybean, wheat, and small-grain harvest where a wide header and substantial crop flow were required. It has the power and feeding capacity to work effectively with 35- and 40-foot grain platforms in suitable crop conditions.
It remains desirable on larger farms as an affordable older high-capacity combine, especially where Deere dealer and salvage support are strong. Owners commonly retain them for their familiar controls, capable rotor system, and compatibility with many Deere headers.
Why the John Deere 9870 STS stands out
The 9870 STS is notable as one of the most powerful and productive STS models, combining a 13.5 L Deere engine with the proven single-tine separator system. Its strong dealer network, broad header compatibility, and established aftermarket support help sustain interest. Confirm configuration-dependent figures with Deere and TractorData.com/manufacturer records.
Buying a used John Deere 9870 STS
Prioritize separator and engine hours, then inspect the feederhouse chain, reverser, variable-speed and rotor-drive components, concaves, separator tines, grates, shoe, clean-grain elevator, and unloading system. Test ProDrive, header controls, sensors, electrical functions, and any precision-ag equipment, since repairs can be substantial on a high-hour flagship combine.
John Deere 9870 STS frequently asked questions
How much horsepower does a John Deere 9870 STS have?
It is commonly rated at 440 engine hp, with additional unloading power boost on equipped machines.
What years was the 9870 STS built?
The 9870 STS is generally listed as a 2008-2012 model.
What grain tank does a 9870 STS use?
Its standard grain tank capacity is 300 bushels.
Specifications are commonly cited figures for general reference; exact figures vary by year and serial number, so confirm against TractorData.com and the machine's records. Values and prices of used combines vary by condition, hours, and region. Page updated Aug 4, 2026.