JOHN DEERE 644K POWERLLEL W/Q COUPLER WHEEL LOADER

Technical Description

The John Deere 644K Powerllel W/Q Coupler is a mid-size wheel loader powered by a John Deere PowerTech 6.8L 6-cylinder turbocharged diesel engine producing 232 horsepower and 783 lb.-ft. of torque at 1,400 rpm. The loader features a 3.2 cubic yard bucket capacity with a robust 26,519 lbs breakout force, enabling efficient material handling across diverse applications. Its innovative Powerllel linkage system delivers powerful digging forces with parallel lift capabilities, allowing load forces to work with rather than against the boom for superior performance throughout the dump and rollback range. The variable displacement hydraulic system provides 307 liters per minute of flow at maximum capacity with a 3,650 psi relief setting, enabling impressive cycle times of 1.9 seconds for dumping, 2.8 seconds for lowering, and 6.1 seconds for raising. With an operating weight of 19,760 kilograms and a 40-degree articulation capability in each direction, the 644K delivers a 5-meter turning radius and maximum travel speed of 40 km/h. The countershaft powershift transmission features four forward and three reverse gears, providing smooth power delivery and operational flexibility. Measuring 28 feet in length with an 11.3-foot cab height and 9.5-foot width over tires, the loader combines compact dimensions with substantial lifting capacity, making it ideal for construction, landscaping, and material recovery operations requiring both performance and maneuverability.