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Wheel Loader

  • Net Power: 173 kW (232 hp) @ 1,700 rpm
  • Bucket Capacity: 3.1–3.2 m³ (4.0–4.25 cu. yd.)
  • Operating Weight: 18 682 kg (41 188 lb)

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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 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.

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.

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

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.

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.

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


Compare the specifications of up to 4 models

DRIVELINE 644k-wheel-loader
Current Model
Engine Manufacturer John Deere
Engine ModelPowerTech PSS 6090
Emission RatingTier 4
Displacement, ltr (Inches³)9 (548)
Rated Speed, rpm1700
Engine Output - Net, kW (hp)173 (232)
Torque, Nm (lbf / ft)1062 (783)
Torque Rise, %56
Transmission TypePowershift
Front Differential TypeLocking
Rear Differential TypeOpen
Tire size - Standard23.5 R25
Service Brake - TypeWet Disc
Service Brake - LocationAxle Inboard
Service Brake - ActuationHydraulic
Parking Brake - TypeWet Multi Disc - Transmission
Height - Over Cab, mm (ft/in)3430 (11 ft 3 in)
Wheelbase, mm (ft/in)3260 (10 ft 8 in)
Length - Including Bucket, mm (ft/in)8300 (27 ft 3 in)
Ground clearance, mm (inches)461 (18.1)
Width Over tires - Std, mm (ft/in)2875 (9 ft 5 in)
Height - Pivot Pin, mm (ft/in)4120 (13 ft 6 in)
Reach - At 2130mm 45° Dump, mm (ft/in)1610 (5 ft 3 in)
Turning Circle - Maximum, mm (ft/in)13280 (43 ft 7 in)
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, m³ (yd³)3.2 (4.25)
Bucket Capacity - Smallest, m³ (yd³)3.1 (4)
Largest bucket capacity, m³ (yd³)3.2 (4.25)
Breakout - Bucket , kgf (lbf)15378 (33903)
Ride Control SystemOptional
System Voltage, V24
Alternator Output, Amp130
Pump TypePiston
Pump Flow, lt/min (gallons (US) / min)297 (78)
System Pressure, bar (PSI)251.66 (3650)