2016 - 2023 JOHN DEERE 644J Z-BAR WHEEL LOADER

Technical Description

The John Deere 644J Z-Bar Wheel Loader features a turbocharged charge air-cooled 6068H six-cylinder engine with a displacement of 414 cu in, delivering 185 hp (138 kW) at 2200 rpm and a torque rise of 55%, peaking at 1400 rpm. The loader operates with an automatic powershift transmission offering four forward and three reverse gears, achieving maximum speeds of 22 mph forward and 15.5 mph in reverse. Its hydraulic system includes a variable axial piston pump with a flow capacity of 68 gal/min (257 l/min), relief valve setting at 3600 psi, and cycle times of 6.2 seconds to raise and 1.4 seconds for dumping. The bucket provides a breakout force of 34,407 lbs (15,607 kg) with a heaped capacity of 4.3 cubic yards (3 m³) and struck capacity of 3.7 cubic yards (2 m³), measuring 9.5 ft (3 m) wide and offering a dump clearance of 9.7 ft (3 m) at maximum raise. Key dimensions are 26.5 ft (8 m) length with bucket on ground, 9.5 ft (3 m) width over tires, 11.2 ft (3 m) cab height, and 10.5 ft (3 m) wheelbase, with a 1.5 ft (0 m) ground clearance. Operating weight is approximately 40,150 lbs (18,212 kg). The loader runs on 24 V electrical system with an 80A alternator and has a fuel capacity of 93 gallons (352 L). It features a turning radius of 18 ft (5 m), rear axle oscillation of 26°, and uses 23.5 R25 tires. Hydraulic, engine oil, and transmission fluid capacities support robust operation for various construction and loading tasks, emphasizing power, efficiency, and durability.