John Deere Interim Tier 4/Stage III B

February 2010 Vol. 65 No. 2

John Deere Power Systems has a new naming convention and ratings for its Interim Tier 4/Stage III B engines.

The names will capitalize on the PowerTech brand but add a three-letter suffix that designates the engine’s technology package. An example of the new names is the PowerTech PVX 6.8L. The new ratings for the Interim Tier 4/Stage III B engines will be 138 kW to 448 kW (185 hp to 600 hp).

The three letters define the engine’s technology platform, turbocharger and exhaust filter. All of the John Deere Interim Tier 4/Stage III B engines with ratings 130 kW (174 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 engine controls, high-pressure fuel systems and air-to-air aftercooling. These engines use either a variable geometry turbocharger (designated “V”) or series turbochargers (designated “S”), and they also feature an exhaust filter (designated “X”).

The primary difference between the PowerTech PVX and PSX engine models is the variable geometry turbocharger (VGT) versus series turbochargers, consisting of a VGT and a fixed-geometry turbocharger. The 13.5L model is available only with series turbochargers. The PowerTech PVX engine models deliver similar power, transient response, peak torque and fuel economy as the Tier 3/Stage III A engine models they replace. The same performance benefits are extended to the PowerTech PSX engine models, which also provide improved low-speed torque and enhanced high-altitude operation. 800.JD-ENGINE,

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