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The new 644K Hybrid Wheel Loader from John Deere utilizes two sources of energy: diesel and electric. The hybrid loader captures regenerated energy as it’s being created and uses it to power the machine. The 644K Hybrid is equipped with a John Deere PowerTech 6.8-L IT4/Stage IIIB engine that runs at an operator-selected constant speed from 900 to 1,800 rpm. The hybrid boasts a net 229 hp and is equipped with all the key features of the conventional John Deere K-Series Wheel Loader line. The machine’s hybrid technology delivers performance that is equal to or better than the conventional 644K, depending on the application. The engine’s constant operating speed maintains continuous hydraulic flow at all times, which delivers crisp hydraulic responsiveness and reduces cycle times. The electric motor smoothly delivers torque resulting in fluid operation and a smoother ride.