JOHN DEERE 644K HIGH-LIFT WHEEL LOADER

Technical Description

The John Deere 644K High-Lift Wheel Loader is a mid-size, versatile material handling machine featuring a turbocharged 6-cylinder PowerTech engine delivering 232 net horsepower at 1,700 rpm. With a heaped bucket capacity of 4.3 cubic yards and a breakout force of 30,384 lbs, the 644K excels in loading and earthmoving applications. The High-Lift configuration provides exceptional dump clearance of 10.8 feet at maximum raise, with an additional 420mm height advantage over standard models, offering superior reach at full lift height. Operating at a gross weight of 40,798.8 lbs, the loader delivers 1,062 Nm of torque with 55% torque rise for consistent performance in demanding conditions. The hydraulic system produces 81.9 gallons per minute at 3,650 psi relief pressure, enabling rapid cycle times of 5.5 seconds raise, 1.4 seconds dump, and 3 seconds lower. The four-speed powershift transmission provides forward speeds to 22.8 mph and reverse to 15.5 mph, while the 18.3-foot turning radius enhances maneuverability on job sites. Standard equipment includes a 24V electrical system, 93-gallon fuel capacity, and 23.5 R25 tires. The loader features wet disc service brakes and wet multi-disc parking brake with automatic differential lock, ensuring reliable operation across varied terrain and material handling scenarios.