In recent years, tractors have become increasingly popular for agriculture and construction tasks. They are versatile, powerful and able to operate in a wide range of conditions. However, many of the engines used in tractors emit harmful pollutants. To combat this, regulations have been introduced that require some tractors to use diesel exhaust fluid (DEF). This article will explain what DEF is and which tractors are required to use it.
What is DEF?
DEF is a fluid that is injected into the diesel engine exhaust system of certain types of tractors. It contains a mixture of urea and deionized water. The urea breaks down into ammonia when it is exposed to the hot exhaust gases from the engine. This ammonia then reacts with the nitrogen oxides in the exhaust to form harmless nitrogen and water vapor. The use of DEF reduces the amount of nitrogen oxides that are released into the atmosphere by the tractor's engine.
Which tractors require DEF?
Tractors that are required to use DEF are those that fall under the Tier 4 emissions regulations set out by the Environmental Protection Agency (EPA). These regulations apply to diesel engines with a horsepower of more than 25. Tier 4 engines were introduced to reduce the amount of particulate matter and nitrogen oxides emitted by diesel engines. Tractors with Tier 4 engines must use DEF to comply with the EPA's emissions regulations.
How is DEF used in tractors?
DEF is added to a separate tank on the tractor and is then injected into the exhaust stream using a special dosing system. The dosing system ensures that the correct amount of DEF is injected into the exhaust to achieve the required emissions reduction. The tractor's engine control unit (ECU) monitors the amount of DEF that is used and will notify the operator if more DEF is required. It is important to ensure that the correct type of DEF is used as the wrong type can damage the dosing system and cause the engine to fail.
Conclusion
In conclusion, DEF is a fluid that is used to reduce the emissions of harmful pollutants from diesel engines. Many tractors with Tier 4 engines are required to use DEF to comply with the EPA's emissions regulations. It is important to follow the manufacturer's instructions when adding DEF to ensure that the dosing system operates correctly. Using the correct type of DEF is also essential for the proper functioning of the engine. Overall, the use of DEF in tractors is an important step in reducing the environmental impact of agriculture and construction.