JOHN DEERE 644E WHEEL LOADER

Technical Description

The John Deere 644E is a mid-size wheel loader powered by a turbocharged six-cylinder 6466T diesel engine producing 160 SAE net horsepower (119 kW) and 168 gross horsepower (125 kW) at 2200 rpm, with maximum torque of 510 lb-ft at 1400 rpm. The machine features a 466 cubic inch (7.636L) displacement engine coupled to a four-speed power shift transmission with torque converter, delivering forward speeds up to 25.5 mph and reverse speeds to 16.4 mph. The hydraulic system operates at a 2850 psi relief valve setting with a gear pump capacity of 65.5 gallons per minute, enabling a 6.2-second raise time, 1.8-second dump time, and 3.5-second lower time. The loader accommodates buckets with 3.25 cubic yards heaped capacity and 37,073 lbs breakout force, with a maximum dump clearance of 9.8 feet. Dimensionally, the machine measures 25.2 feet in length with bucket on ground, 8.71 feet wide over tires, and 11.16 feet to cab top, with a 10.5-foot wheelbase and 17.8-foot turning radius. Operating weight is 34,108 lbs with a static tipping load of 27,181 lbs. The fuel capacity is 75 gallons, hydraulic fluid capacity is 30.4 gallons, and the system operates on 12-volt electrical power with a 65-amp alternator.