Building on previous tier nomenclature, John Deere Final Tier 4/Stage IV engine names will start with the PowerTech brand and add a three-letter suffix that specifies the engine’s technology package.
For Final Tier 4/Stage IV, the three letters will identify the engine’s technology platform, turbocharger and after treatment, respectively. An example of a John Deere Final Tier 4/Stage IV engine name is PowerTech PSS 6.8L.
All John Deere Final Tier 4/Stage IV engines with power ratings 75 hp and above are designated “P,” indicating the Tier 3/Stage III A PowerTech Plus technology platform that features 4-valve cylinder heads, cooled exhaust gas recirculation, full-authority electronic controls, high-pressure fuel systems and air-to-air after cooling. These engines utilize a variable geometry turbocharger (designated “V”), series turbochargers (“S”) or a wastegate turbocharger (“W”). After-treatment technology for engines 75 hp and above includes an exhaust filter and selective catalytic reduction — a combination that is designated “S.”
John Deere engines with power ratings below 75 hp are designated “E” to indicate the PowerTech E technology platform that includes 2-valve cylinder heads, full-authority electronic controls, high-pressure common-rail fuel system and air-to-air after cooling. These engines utilize a wastegate turbocharger (designated “W”) and an exhaust filter (“X”).
Models and power ratings for the complete John Deere Final Tier 4/Stage IV engine lineup include:
• PowerTech EWX 2.9L: 50 hp-74 hp
• PowerTech EWX 4.5L: 74 hp
• PowerTech PWS 4.5L: 85 hp-140 hp
• PowerTech PSS 4.5L: 125 hp-173 hp
• PowerTech PVS 6.8L: 140 hp-250 hp
• PowerTech PSS 6.8L: 225 hp-300 hp
• PowerTech PSS 9.0L: 250 hp-425 hp
• PowerTech PSS 13.5L: 400 hp-600 hp