2001-2012 JOHN DEERE 644K HYBRID WHEEL LOADER

Technical Description

The John Deere 644K Hybrid Wheel Loader combines a 229 hp (171 kW) PowerTech PSX 6068 Tier 4 engine with a hybrid-electric powershift transmission to deliver superior fuel efficiency and performance. It offers up to 25% better average fuel efficiency than comparable conventional models by capturing and reusing energy during operation. The loader’s bucket capacity ranges from 4.1 to 4.2 cubic yards (3 m³) with a breakout force of 33,903 lbs (15,378 kg), enabling strong material handling and efficient loading cycles. The machine features a hydraulic system with a 28.1-gallon reservoir and a piston pump delivering 78.5 gallons per minute at 251.7 psi system pressure. With a maximum hinge pin height of 13.6 ft (4 m), a dump clearance of 9.7 ft (3 m), and a reach at max lift and dump of 5.3 ft (2 m), it supports high productivity in diverse loading applications. The wheel loader weighs approximately 40,436 to 42,206 lbs (18,342 to 19,145 kg) and has a standard tire size of 23.5 R25. It includes a locking front differential and an open rear differential for improved traction, with wet multi-disc transmission parking brakes and hydraulic wet disc service brakes located inboard at the axles for reliable stopping power. The cab height is 11.3 ft (3 m), and the machine’s overall length with the bucket on the ground is 27.3 ft (8 m), with a turning circle of 43.6 ft (13 m). A 24 V electric system with a 100 A alternator supports onboard systems. This model balances fuel efficiency, power, and operational versatility for demanding earthmoving tasks.