John Deere has been integrating engines and drivetrains into machines since 1949 when they built their first diesel engine for the Model R tractor. In the 1970s, OEMs quickly realized they could tap into this knowledge and power for their equipment, too. Today, John Deere has built solid relationships with OEMs around the world. OEM engines and drivetrain components aren't a side business for John Deere Power Systems... Countless hours of lab testing, field prototype machines, and rugged off-highway applications have proven you don't have to sacrifice performance to comply with emissions standards. All John Deere Final Tier 4/Stage IV engines maintain power density, torque, and transient response — and that means more productivity, more uptime, and more value for your machines.