The 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.
According to the company, the loader is equipped with a PowerTech 6.8-liter Tier 4 Interim engine that runs at an operator-selected constant speed between 900 to 1,800 rpm. The hybrid boasts a net 229 hp and is equipped with all of the key features of John Deere’s K-Series wheel loader line.
John Deere adds that the engine’s constant operating speed maintains continuous hydraulic flow at all times, delivering crisp hydraulic responsiveness and reducing cycle times. The electric motor smoothly delivers torque, resulting in fluid operation and a smoother ride.
Another benefit of the hybrid design is noise reduction on the jobsite. Because the engine runs at a constant speed instead of increasing and decreasing speed as the machine is worked, the engine noise is continuous and therefore less noticeable to both the operator inside the cab and bystanders outside, John Deere says.