JOHN DEERE 644H HIGH LIFT WHEEL LOADER

Technical Description

The John Deere 644H High Lift is a mid-size wheel loader engineered for versatile material handling operations. Powered by a turbocharged 6-cylinder 6081H engine displacing 496 cubic inches, it delivers 180 net horsepower at 2,200 rpm with maximum torque of 745 lb-ft at 1,300 rpm. The loader features a 4-gear power-shift transmission with forward speeds up to 24 mph and a 3-speed reverse reaching 16.4 mph, enabling efficient job-site mobility. The hydraulic system employs a piston pump with 68 gallons-per-minute flow capacity and 3,600 psi relief valve setting, enabling rapid cycle times: 6.2-second raise, 1.4-second dump, and 3-second lower operation. The high-lift boom configuration provides maximum hinge pin height of 15 feet with a 30,574-pound breakout force and lift capacity of 20,226 pounds at maximum height. The heaped bucket capacity reaches 4.3 cubic yards with 11.1 feet dump clearance. Dimensionally, the machine spans 28 feet in length with 8.9 feet width over tires, 10.5-foot wheelbase, and 18-foot turning radius, optimizing maneuverability in confined spaces. Ground clearance measures 1.6 feet with 26-degree rear axle oscillation for uneven terrain traversal. The operating weight of 39,000 pounds with 24,798-pound static tipping load ensures stability during loaded operations. Equipped with 20.5-25 tires, a 90-gallon fuel capacity, and full fluid reservoirs totaling approximately 68 gallons system capacity, the 644H High Lift delivers dependable performance for loading, stockpiling, and material transfer applications.