2020 - 2023 JOHN DEERE 644D WHEEL LOADER

Technical Description

The John Deere 644D Wheel Loader is a robust mid-sized construction machine designed for heavy-duty material handling tasks. It features a turbocharged 6-cylinder, 466 cu in diesel engine delivering 165 hp gross (155 hp net) at 2200 rpm, with peak torque at 1400 rpm. This power is transferred through a 4-speed power shift planetary transmission, allowing a maximum forward speed of 27.3 mph and reverse speed of 8.2 mph. The loader's operating weight is approximately 29,320 lbs, with a wheelbase of 9.6 ft and a width of 8.6 ft over the tires, which are sized 20.5-25. The loader comes equipped with a gear-type hydraulic pump providing 63 gallons per minute at 2625 psi, enabling efficient hydraulic movement with fast cycle times: 6.1 seconds to raise, 2 seconds to dump, and 4.3 seconds to lower the bucket. The bucket itself has a struck capacity of 2.6 cubic yards (3 cubic yards heaped), with an 8.8 ft wide bucket. Dump clearance at maximum lift reaches 9.8 ft, and the hinge pin height is 12.7 ft. The reach at max lift and dump is 3.1 ft. Additional features include a rear axle oscillation of 22 degrees for better terrain adaptability, a fuel tank capacity of 67 gallons, and a 12-volt electrical system with a 42-amp alternator. Dimensions include a machine height to top of cab of 10.5 ft and a turning radius of 16.5 ft. This loader’s combination of powerful engine, efficient hydraulics, and durable frame makes it suitable for demanding construction and earthmoving applications.