John Deere Tier 4 Final models to dose DEF at between 1-3%

Christopher Goodfellow - 20 April 2012

John Deere says that its new PowerTech PSS 9.0L Tier IV Final diesel engine will consume Diesel Exhaust Fluid (DEF) at between 1-3% of diesel use.

Unlike previous models the new power train combines Selective Catalytic Reduction (SCR) and cooled Exhaust Gas Recirculation (EGR) technology. Reducing DEF consumption has allowed the manufacturer to reduce the tank size, minimising the impact on vehicle applications and reducing operator involvement, according to a statement from the company.

Fuel economy has also improved on Stage III B models.

John Piasecki, director of worldwide marketing, sales and customer support for John Deere Power Systems, said: "SCR is an appropriate technology building block for Stage IV, now that it is more mature for off-highway applications, the DEF supply chain infrastructure is better developed, and John Deere has optimized the performance of our SCR system."

For engines 56 kW (75 hp) and above, John Deere's Integrated Emissions Control system will consist of a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF) and a SCR system specifically designed to meet the demands of off-highway applications. The DOC/DPF exhaust filter reduces PM while cooled EGR and the optimised SCR system reduce NOx to the regulatory levels of Stage IV.

John Deere Power Systems will exhibit its PowerTech PSS 9.0L diesel engine at Intermat 2012, April 16 - 21 in Paris.

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