By Mark S. Kuhar
John Deere Power Systems introduced the PowerTech PWL 4.5L engine, which will meet Final Tier 4/Stage IV emissions regulations without a diesel particulate filter (DPF). The 63 kW to 104 kW (85 hp to 140 hp) engine was announced at bauma 2013 in Munich, and complements the John Deere lineup of Final Tier 4/Stage IV off-highway diesel engines rated 36 kW to 448 kW (48 hp to 600 hp) announced earlier.
The PowerTech PWL 4.5L engine reduces cost and improves engine packaging by eliminating the DPF – while still meeting customer performance expectations for applications in the 56 kW to 104 kW (75 hp to 140 hp) power segment.
The PowerTech PWL 4.5L is equipped with an Integrated Emissions Control system consisting of selective catalytic reduction (SCR), a diesel oxidation catalyst (DOC) and cooled exhaust gas recirculation (EGR) technology. Elimination of the DPF was enabled through combustion system optimization and improvements in SCR system conversion efficiency.
“We believe the elimination of the DPF will serve OEMs and end users well in the very competitive 56 kW to 104 kW (75 hp to 140 hp) segment, balancing packaging and product cost considerations with performance and operating cost requirements,” said John Piasecki, director of marketing, sales and customer support for John Deere Power Systems.
“We expect emissions technologies will continue to evolve and improve, and we'll adopt those changes when available to improve the customer experience.”
The introduction of the PowerTech PWL 4.5L engine represents the third Integrated Emissions Control system configuration John Deere will offer for Final Tier 4/Stage IV.
For the 36 kW to 55 kW (48 hp to 74 hp) power range, John Deere will offer models using a DOC/DPF without cooled EGR or SCR. The PowerTech PWL 4.5L in the 56 kW to 104 kW (75 hp to 140 hp) power range will be equipped with an Integrated Emissions Control system configured with SCR, a DOC and cooled EGR. Engine models above 104 kW (140 hp) will feature an Integrated Emissions Control system consisting of cooled EGR, a DOC/DPF and SCR. All John Deere Integrated Emissions Control systems are exclusively designed to meet the specific demands of off-highway applications in the given power categories.
“At John Deere, we tailor our Integrated Emissions Control system configurations to meet customer needs and Final Tier 4/Stage IV emissions regulations,” Piasecki said. “We’re confident that all of our solutions will deliver industry leading performance and value while also meeting required long term emissions compliance.”
John Deere did attain an industry leading fuel economy position with its Tier 3/Stage III A and Interim Tier 4/Stage III B engines. With the move to SCR technology for Final Tier 4/Stage IV engines, total fluid economy becomes important, and John Deere is confident that its total fluid operating costs will continue that industry leadership.
Total Fuel Economy
Total fluid economy takes into account an engine’s total fluid consumption, including diesel fuel and diesel exhaust fluid (DEF). DEF consumption with John Deere Final Tier 4/Stage IV engines will be 1 to 4 percent of diesel fuel consumption depending on the application.
Low DEF consumption also means:
- The DEF tank size can be smaller, minimizing space required on vehicles.
- Extended DEF filter service intervals.
- Less on-site bulk storage requirements.