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 85 hp to 140 hp engine was announced at Bauma 2013 and complements the John Deere lineup of Final Tier 4/Stage IV off-highway diesel engines rated 48 hp to 600 hp.
The PowerTech PWL 4.5L engine reduces cost and improves engine packaging by eliminating the DPF. 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 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 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 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.
John Deere attained 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 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 1) the DEF tank size can be smaller, minimizing space required on vehicles, 2) extended DEF filter service intervals, and 3) less on-site bulk storage requirements.
John Deere Final Tier 4/Stage IV engines will provide the same or higher levels of power density and transient response as the Interim Tier 4/Stage III B product lineup.
Models and power ratings for the full John Deere Final Tier 4/Stage IV lineup include:
“Staying true to our building block approach, we have adopted the best available technologies to meet Final Tier 4/Stage IV regulations while minimizing the impact on OEMs and end users,” Piasecki said. “The Integrated Emissions Control system in its various configurations represents technology optimization that achieves emissions compliance, and delivers the power, performance, ease of operation, fluid efficiency, reliability, durability and economical operating cost customers expect from John Deere.”