1999-2012 JOHN DEERE 644GH WHEEL LOADER

Technical Description

The John Deere 644GH is a mid-size wheel loader powered by a turbocharged and aftercooled 6-cylinder engine displacing 466 cubic inches, delivering 185 net horsepower at 1,800 rpm and 598 foot-pounds of torque at 1,300 rpm. The machine features a 4-cubic-yard heaped bucket capacity with exceptional breakout force of 38,045 pounds, enabling efficient loading of various materials. Its dimensions include an operating length of 25.8 feet with bucket on ground, height to cab of 11.3 feet, and maximum hinge pin height of 13.2 feet, providing excellent visibility and reach capabilities. The loader measures 9 feet wide over tires with a 10.5-foot wheelbase, offering stability during operation. Hydraulic performance includes a gear-type pump delivering 69.5 gallons per minute at 3,000 psi relief pressure, with cycle times of 6.2 seconds for raising, 1.8 seconds for dumping, and 3.5 seconds for lowering. The powershift transmission features four forward gears and three reverse gears, enabling maximum forward speed of 21.5 mph and reverse speed of 13.7 mph. Operating weight is 36,634 pounds with a static tipping load of 29,712 pounds. The machine incorporates a 75.1-gallon fuel capacity and comprehensive fluid systems including 30.4-gallon hydraulic capacity, supporting extended operational periods between service intervals.