1999-2013 JOHN DEERE 644EH WHEEL LOADER

Technical Description

The John Deere 644EH is a robust mid-size wheel loader designed for heavy-duty material handling and earthmoving tasks. Equipped with a turbocharged 6-cylinder 6076A diesel engine, it delivers a gross power of 193 hp (144 kW) and net power of 185 hp (138 kW) at 2200 rpm, with peak torque of 520 lb-ft (705 Nm) at 1400 rpm. The loader features a 3.8 cubic yard (2 m³) heaped bucket capacity with a breakout force of 34,257 lbs (15,539 kg), optimized for efficient digging and loading. The bucket is 9.6 feet (3 m) wide and offers a dump clearance of 9.6 feet (3 m) at maximum raise. Dimensions include a length of 25.8 feet (8 m) with the bucket on the ground, a wheelbase of 10.5 feet (3 m), an overall width over tires of 9 feet (3 m), and a cab height of 11.2 feet (3 m). Ground clearance is 1.7 feet (0.5 m), and the hinge pin reaches a maximum height of 13.2 feet (4 m). Hydraulic functions boast a pump flow capacity of 65.5 gallons per minute (246 L/min) and a relief valve setting of 2850 psi, with typical cycle times of 6.2 seconds to raise, 1.9 seconds to dump, and 3.5 seconds to lower the bucket. The transmission is a power shift type with four forward and three reverse gears, achieving top speeds of 25.5 mph (41 kph) forward and 16.4 mph (26 kph) reverse. Operating weight is approximately 35,306 lbs (16,015 kg), supported by 20.5-25 tires and a 12V electrical system with a 65A alternator. The rear axle oscillates up to 26 degrees, enhancing maneuverability. This loader is well-suited for construction, mining, and aggregate handling demanding strong performance and durability.