John Deere 644K
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  • Engine

    644K Hybrid delivers up to 25-percent better average fuel efficiency than its conventional IT4 counterpart with a lockup torque converter. In applications such as V-pattern truck loading, fuel savings will be even larger.

    EPA IT4/EU Stage IIIB 6.8-L diesel runs at a constant 900, 1,200, 1,500, or 1,800 rpm. Constant speed reduces engine wear, noise levels, and fuel consumption. Top speed provides maximum power and productivity, while the slower settings increase efficiency.

  • Hybrid-Electric Drive

    Hybrid-electric drive smoothly and efficiently recaptures energy to slow the loader when the operator lets off the accelerator. This lessens the load on the engine and reduces fuel consumption.

  • Nevergrease™ Pin Joints

    The NeverGrease™ option includes a pin-joint system for the linkage and boom joints that eliminates greasing, extends pin-joint life, and provides consistent life across the system.

  • Quad-Cool™

    Quad-Cool places the radiator, air-conditioner condenser, intercooler, and hydraulic, transmission, and optional axle coolers in a unique boxed configuration that's isolated from engine heat.

  • Transmission

    PowerShift™ transmission provides smooth moves through four forward speed ranges.

  • Maintenance

    All daily service points, including fuel, are grouped on the left side for quick and convenient ground-level access. Sight gauges enable quick fluid-level checks.

  • Versatility

    Equip your loader with optional Z-Bar, High Lift, Tool Carrier, or Parallel Lift linkages.

    Worksite Pro couplers make attachment switchover easy to get even more out of your machine.

  • Safety & Security

    Sealed-switch module keeps out dust and moisture while eliminating nearly 100 wires. Prevent unauthorized machine operation with keyless-start requiring a numeric pass code.

    Optional rearview camera and radar object-detection system


Fuel Tank, ltr (gallons (US)) 397 (105)
Hydraulic Tank, ltr (gallons (US)) 105.2 (6.95)
Axle - Front, ltr (gallons (US)) 22 (5.75)
Axle - Rear, ltr (gallons (US)) 22 (5.75)
Transmission, ltr (gallons (US)) 23 (6)
Heaped Capacity, m� (yd�) 3.2 (4.25)
Bucket Capacity - Smallest, m� (yd�) 3.1 (4)
Largest bucket capacity, m� (yd�) 3.2 (4.25)
Breakout - Bucket , kgf (lbf) 15378 (33903)
Ride Control System Optional
System Voltage, V 24
Alternator Output, Amp 130
Pump Type Piston
Pump Flow, lt/min (gallons (US) / min) 297 (78)
System Pressure, bar (PSI) 251.66 (3650)