John Deere Power Systems offers Interim Tier 4/Stage III B diesel engines between 56 and 129 kW (75 and 173 hp) in 4.5 and 6.8 L displacements, equipped with either a wastegate or variable geometry turbocharger depending on engine size. Engines are built on the PowerTech four- and six-cylinder engine platform, including cooled exhaust gas recirculation and an exhaust filter for reducing particulate matter. Features include full-authority electronic controls, a four-valve cylinder head, and high-pressure fuel system. Models in this power range feature smaller exhaust filters for flexible engine- or remote-mounting and an in-cylinder dosing system. Engine models include PowerTech PWX 4.5 L for 56 to 91 kW (75 to 122 hp); PowerTech PVX 4.5 L for 93 to 129 kW (125 to 173 hp); and PowerTech PVX 6.8 L for 104 to 129 kW (140 to 173 hp).