2001-2007 JOHN DEERE 644G WHEEL LOADER

Technical Description

The John Deere 644G Wheel Loader features a turbocharged 466 cu in (7.6 L) six-cylinder engine delivering 170 hp (127 kW) net power at 2200 rpm, and a maximum torque of 598 lb-ft at 1300 rpm. It is equipped with a power shift transmission offering 4 forward and 3 reverse gears, reaching speeds up to 21.5 mph forward and 13.7 mph reverse. The loader’s hydraulic system uses a gear pump with a flow capacity of 69.5 gal/min and a relief valve setting of 3000 psi, enabling rapid cycle times: 6.2 seconds to raise and 1.8 seconds to dump. The bucket boasts a breakout force of 35,317 lbs and a heaped capacity of 3.8 cubic yards (2 m³), with a struck capacity of 3.2 cubic yards (2 m³). Key dimensions include a max lift height of 12.6 ft (4 m), dump clearance at max lift of 9.5 ft (3 m), hinge pin height of 13.2 ft (4 m), and a wheelbase of 10.5 ft (3 m). The machine weighs approximately 35,236 lbs (15,983 kg), operates on 12 V electrical system with a 95 A alternator, and has a fuel capacity of 75 gallons (284 L). Tire size is 20.5-25. Ground clearance is 1.6 ft (0.5 m). It features a hydraulic front differential lock for enhanced traction, rear axle oscillation of 26°, and a turning radius of 18 ft (5 m). The cab height is 11.3 ft (3 m), providing operator comfort and visibility. This robust loader is designed for efficient material handling and construction tasks, combining powerful performance with durable hydraulics and engine systems.