Three John Deere Power Systems models—the PowerTech PWX 4.5L and PVX 4.5L engines, and the PowerTech PVX 6.8L model below 174 horsepower—in its lineup of 75 to 174 horsepower off-highway diesel engines are now certified as compliant with U.S. Environmental Protection Agency Interim Tier 4, European Union Stage III B and California Air Resources Board emissions regulations.
