PowerTech™ PWL FT4 technology
Overview
All John Deere engines are designed and engineered specifically for agricultural applications. The engine powering 5 Series tractors is EPA certified Tier Level 4.
Benefits
- Efficient and cost-effective operation
- Allows for greater productivity and ease of operation
- Responsive power reducing the need to downshift the transmission
Additional details
The U.S. EPA and Environment Canada requires all off-road diesel engines with 18.6 kW (25 hp) or more to meet stringent FT4 emissions regulations.
PowerTech EWL/EWR/EWX/PWL/PWS/PSS/PVS engine identification
NOTE: find a tractor’s 3 character engine identification by referencing the ‘engine description’ in specifications.
| EWL  |
Aftertreatment
- X – DOC and DPF
- S - Exhaust filter and SCR
- R – DOC and EGR
- L - DOC and SCR
|
Turbocharger
- V - Variable geometry turbocharger (VGT)
- S - Series turbochargers
- W - Wastegate turbocharger
|
Technology
- P - PowerTech Plus
- E - PowerTech E
|
Several defining features on 5 Series tractors maximize the performance and reliability of the emissions package. A completely shielded DOC/DPF/SCR not only protects essential components from damage, it also keeps out dirt and debris. The well-packaged and tightly organized circulation system means there is more room to work around the tractor.
Key components of the emissions system
Shielded for protection
Diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and cooled exhaust gas recirculation (EGR)
Deere has chosen to utilize an exhaust filter (DOC) and/or diesel particulate filter (DPF) to reduce particulate material so the engine can operate at a level which produces less nitrogen oxide (NOx). With less NOx created, it requires less DEF to treat or no DEF for 3-cylinder models. The result is improved total fluid economy (diesel and DEF). Some applications also reduce NOx using cooled exhaust gas recirculation (EGR) that allows a controlled amount of exhaust gas to be returned to the engine leading to lower combustion temperature for a cleaner, more efficient exhaust.
The engine is programmed to aggressively respond to changes in power needs, which can temporarily increase particulate matter. Since the exhaust filter removes particulate matter instead of the engine, the engine is left free to do what it is designed to do – deliver all of the power, torque, plus transient response needed at the exact moment needed.
Diesel exhaust fluid (DEF)
DEF is an ISO 22241 standard aqueous urea solution consisting of 32.5 percent urea and has a freezing point of -11° C (12° F). A DEF tank keeps the operator in the field longer even when the temperatures drop below freezing. The DEF tank header is integrated with a temperature sensor and plumbed engine coolant lines are used to promote thawing and prevent freezing in the tank during operation.
DEF tank
Mounted near the DEF tank, the engine control unit (ECU)-controlled supply module draws DEF from the storage tank and provides a pressurized flow to the dosing module. When the ignition key is off, the supply module pump will reverse direction to return any accumulated fluid back to the tank. The supply module is also fitted with a replaceable filter to prevent contaminants from entering the dosing lines. Both the supply module and dosing lines are electrically heated and controlled by the ECU to determine when diesel exhaust fluid dosing can begin.
Selective catalytic reduction (SCR)
SCR is the final step in the process of reducing engine exhaust emissions to meet FT4 regulations. This process allows for the flow of engine exhaust dosed with DEF to pass from the SCR, reducing the presence of NOx converting it from NH3 to N2 (nitrogen gas) and H20 (water). The SCR canister is a welded, stainless assembly which requires no service. It also serves as a thermal insulator and provides additional noise reduction.
For more information regarding EPA regulations and the technology behind John Deere Integrated Emissions Control systems, please visit the following link: http://www.deere.com/wps/dcom/en_US/campaigns/ag_turf/emissions/final_tier_4.page or https://www.deere.ca/en/engines-and-drivetrain/final-tier-4/