The John Deere Construction 644 X Wheel Loader (2021-2026) combines above-average engine power at 231 hp (172 kW) with typical weight at 41,650 lb (18.9 t). Its published maximum bucket capacity is 4.71 yd³ (3.6 m³).
Specification profile
Wheel Loader • 2021-2026
Weight: 41,650 lb (18.9 t)Engine power: 231 hp (172 kW)Maximum bucket capacity: 4.71 yd³ (3.6 m³)Minimum bucket capacity: 4.05 yd³ (3.1 m³)
41,650 lb (18.9 t)Weight
231 hp (172 kW)Engine power
4.71 yd³ (3.6 m³)Maximum bucket capacity
4.05 yd³ (3.1 m³)Minimum bucket capacity
24.9 mph (40 km/h)Travel speed
1,500 rpmEngine speed at max torque
808 lb-ft (1,095 Nm)Maximum torque
9.97 ft (3.04 m)Transport width
How it compares
Low, average or high?
Engine power
Above average
231 hp (172 kW)
Low 44.3 hp (33 kW)Typical 212 hp (158 kW)High 814 hp (607 kW)
Engine power is above the typical figure.
Weight
Average
41,650 lb (18.9 t)
Low 7,419 lb (3.37 t)Typical 43,268 lb (19.6 t)High 210,541 lb (95.5 t)
Weight is close to the typical figure.
Maximum bucket capacity
Below average
4.71 yd³ (3.6 m³)
Low 1.05 yd³ (0.8 m³)Typical 5.37 yd³ (4.11 m³)High 17 yd³ (13 m³)
Maximum bucket capacity is below the typical figure.
Minimum bucket capacity
Above average
4.05 yd³ (3.1 m³)
Low 0.78 yd³ (0.6 m³)Typical 3.71 yd³ (2.84 m³)High 12.4 yd³ (9.5 m³)
Minimum bucket capacity is above the typical figure.
Travel speed
Above average
24.9 mph (40 km/h)
Low 12 mph (19.3 km/h)Typical 21.4 mph (34.4 km/h)High 26.7 mph (43 km/h)
Travel speed is above the typical figure.
Maximum torque
Above average
808 lb-ft (1,095 Nm)
Low 107 lb-ft (145 Nm)Typical 732 lb-ft (992 Nm)High 2,104 lb-ft (2,852 Nm)
Maximum torque is above the typical figure.
Visual overview
Key measurements
Capacity
Published capacity figures shown together for quick comparison.
Working dimensions
Useful working and clearance measurements shown side by side.
Overall size
The main published dimensions shown together at a glance.
Equipment
Features & equipment
Published equipment and feature availability for this model.
Air conditioningYES
Diesel particulate filterNO
Hydraulic quick hitchNO
Mechanical quick hitchNO
Swing loaderNO
TelescopicNO
Overview
Model information
| Manufacturer | John Deere Construction |
|---|---|
| Model | 644 X |
| Category | Wheel Loader |
| Model year / production | 2021-2026 |
Full specifications
Technical details
Performance
Engine power231 hp (172 kW)
Maximum torque808 lb-ft (1,095 Nm)
Engine speed at max torque1,500 rpm
Travel speed24.9 mph (40 km/h)
Dimensions
Bucket width9.97 ft (3.04 m)
Transport height11.3 ft (3.45 m)
Transport length28.6 ft (8.72 m)
Transport width9.97 ft (3.04 m)
Outside turning radius18.5 ft (5.64 m)
Capacity & weight
Maximum bucket capacity4.71 yd³ (3.6 m³)
Minimum bucket capacity4.05 yd³ (3.1 m³)
Weight41,650 lb (18.9 t)
Swing loaderNo
Engine & drivetrain
Displacement1.8 US gal (6.8 L)
Emission levelTier 4/Stage V
Engine manufacturerJohn Deere
Engine typePowerTech PSS 6090
Number of cylinders6.0
Setup & fitment
Hydraulic quick hitchNo
Mechanical quick hitchNo
Standard tyres23.5 R25
Features
Air conditioningYes
Diesel particulate filterNo
TelescopicNo
Other specifications
Model seriesX
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