Interim Tier 4 Power
- Written by CP Staff
PowerTech PWX 4.5L, PVX 4.5L and PVX 6.8L engines, part of John Deere’s off-highway diesel lineup, are certified compliant with EPA Interim Tier 4, EU Stage III B and California Air Resources Board (CARB) emissions regulations. The PowerTech engines join the previously certified lineup of John Deere engines above 174 hp (130 kW).
EPA Interim Tier 4 and EU Stage III B emissions regulations for 75-hp (56-kW) to 174-hp (130-kW) engines require a 90 percent reduction in diesel particulate matter (PM) and up to an approximate 30 percent reduction in nitrogen oxide (NOx) from previous Tier 3/Stage III A requirements. John Deere met this challenge by starting with their PowerTech Plus Tier 3/Stage III A engine platform—which includes cooled exhaust gas recirculation (EGR) for NOx control—and adding an exhaust filter for reducing PM. Engines will feature full-authority electronic controls, a 4-valve cylinder head, a high-pressure fuel system, wastegate or variable geometry turbocharging and an air-to-air aftercooling system.
In choosing a solution for Interim Tier 4/Stage III B, John Deere elected not to use selective catalytic reduction (SCR). John Deere’s cooled EGR and exhaust filter approach provides OEMs and end users a proven solution with total fluid economy. Engines featuring cooled EGR take a diesel-fuel-only approach, while SCR-equipped engines utilize both diesel fuel and diesel exhaust fluid to achieve emissions compliance. — John Deere Power Systems, www.JohnDeere.com/jdpower