The company’s lineup of Interim Tier 4 generator drive diesel engines reduce diesel particulate matter (PM) by 90% and nitrogen oxide (NOx) by 50% while delivering quick-starting, clean running, and fuel-efficient performance in a compact size. Engines in the 56 kW and above group feature the PowerTech Plus Tier 3 engine platform, cooled exhaust gas recirculation for NOx control, an exhaust filter to reduce PM, full authority electronic controls, a four valve cylinder head, a high-pressure fuel system, turbocharging, and an air-to-air aftercooling system. Engines ranging between 56 and 129 kW and below 56 kW also are available and meet emissions regulations. John Deere Power Systems. 800-533-6446.