August 24, 2023

[Navigating Tractor Emissions Regulations | Part 2] John Deere's Stage 5 Engine Tractors: A Compliant Solution for Tractor Emissions Regulations


John Deere uses a combination of innovative engine designs and new technology to meet varying application and emissions requirements around the world. This article is to explore some of the key technologies leveraged by John Deere to comply with the two major nonroad emissions regulations — the U.S. Environmental Protection Agency (EPA) and the European Union (EU):

Air-to-Air Aftercooling

Air-to-Air Aftercooling is a technology used in internal combustion engines, particularly in turbocharged and supercharged engines. After the air is compressed by the turbocharger or supercharger, it gets heated. Air-to-Air Aftercooling involves cooling this compressed air before it enters the engine's combustion chamber. This is typically achieved by passing the hot compressed air through a heat exchanger wherein it is cooled by the ambient air that is present outside the engine. The benefits this technology does can be summarized as follows:

  • Combustion Process Optimization: Cooler intake air allows for better combustion, which improves the overall engine efficiency and performance.
  • Reduced Emissions: The cooler air helps reduce the formation of nitrogen oxides (NOx) and other harmful emissions during the combustion process.
  • Increased Power Output: Cooler air is denser, meaning more oxygen is available for combustion, and this leads to increased power output.

Cooled Exhaust Gas Recirculation (EGR)

Cooled Exhaust Gas Recirculation (EGR) is an emission control technique used in internal combustion engines, especially diesel engines. A portion of the exhaust gases is redirected back into the engine's intake system and in which it is mixed with the incoming air before it enters the combustion chamber. However, in "cooled" EGR, the exhaust gases are first cooled before being recirculated which makes it more effective. As a result, the following benefits can be achieved:

  • Lower Combustion Temperatures: By introducing inert exhaust gases into the combustion chamber, the peak combustion temperatures are reduced. This helps in controlling the formation of NOx, which is a major contributor to air pollution and smog.
  • Reduced NOx Emissions: Lower combustion temperatures lead to decreased nitrogen oxide (NOx) emissions, which is a major contributor to air pollution and smog. This reduced NOx emissions improve the engine's environmental performance.

Series Turbocharging Options

Turbocharging is a method of forced induction that increases the power output of an engine by compressing the intake air. John Deere offers various turbocharging options such as Fixed Geometry Turbocharger, Wastegate Turbocharger (WGT), and Variable Geometry Turbocharger (VGT). This series of turbocharging options is an effective means for increasing intake air pressure. By splitting the compression of the air between two turbochargers, both can operate at peak efficiency and at slower rotating speeds. This lowers stress on turbocharger components and improves reliability.

The Right Choice for Farmers: Meeting Tractor Emissions Regulations

John Deere's Stage 5 engine tractors are the ideal choice for farmers who prioritize compliance with tractor emission regulations. By selecting John Deere, farmers can gain access to proven technologies and extensive experience in meeting major nonroad emission regulations worldwide. These tractors are not only suitable for the European Union and the United States, but also for regions like Asia, Middle East, and South America.

John Deere's commitment to emissions compliance coupled with our long-standing history of working on reducing engine emissions, makes us a trusted choice for farmers worldwide. Through innovative engine designs, advanced emission technologies, and adherence to stringent regulations, John Deere's Stage 5 engine tractors provide a compliant solution that not only benefits the environment, but also helps enhance the performance and productivity of farmers. By choosing John Deere, farmers can confidently embrace sustainable practices while meeting the ever-evolving tractor emissions regulations.


* For more information about John Deere’s Stage 5 Engine Tractors, you can contact your local John Deere dealers or leave your inquiry through our Contact us form.