The John Deere Construction 644 A Wheel Loader (1971-1978) combines below-average engine power at 189 hp (141 kW) with low weight at 25,871 lb (11.7 t). Its published maximum bucket capacity is 3.01 yd³ (2.3 m³).
Specification profile
Wheel Loader • 1971-1978
Weight: 25,871 lb (11.7 t)Engine power: 189 hp (141 kW)Maximum bucket capacity: 3.01 yd³ (2.3 m³)Minimum bucket capacity: 2.22 yd³ (1.7 m³)
25,871 lb (11.7 t)Weight
189 hp (141 kW)Engine power
3.01 yd³ (2.3 m³)Maximum bucket capacity
2.22 yd³ (1.7 m³)Minimum bucket capacity
23 mph (37 km/h)Travel speed
8.69 ft (2.65 m)Bucket width
10 ft (3.05 m)Transport height
20.6 ft (6.29 m)Transport length
How it compares
Low, average or high?
Engine power
Below average
189 hp (141 kW)
Low 44.3 hp (33 kW)Typical 212 hp (158 kW)High 814 hp (607 kW)
Engine power is below the typical figure.
Weight
Low
25,871 lb (11.7 t)
Low 7,419 lb (3.37 t)Typical 43,268 lb (19.6 t)High 210,541 lb (95.5 t)
Weight is well below the typical figure.
Maximum bucket capacity
Low
3.01 yd³ (2.3 m³)
Low 1.05 yd³ (0.8 m³)Typical 5.37 yd³ (4.11 m³)High 17 yd³ (13 m³)
Maximum bucket capacity is well below the typical figure.
Minimum bucket capacity
Low
2.22 yd³ (1.7 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 well below the typical figure.
Travel speed
Average
23 mph (37 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 close to the typical figure.
Transport height
Below average
10 ft (3.05 m)
Low 7.71 ft (2.35 m)Typical 11.1 ft (3.38 m)High 18.4 ft (5.6 m)
Transport height is below the typical figure.
Visual overview
Key measurements
Capacity
Published capacity figures shown together for quick comparison.
Overall size
The main published dimensions shown together at a glance.
Equipment
Features & equipment
Published equipment and feature availability for this model.
Air conditioningNO
Diesel particulate filterNO
Hydraulic quick hitchNO
Mechanical quick hitchNO
Swing loaderNO
TelescopicNO
Overview
Model information
| Manufacturer | John Deere Construction |
|---|---|
| Model | 644 A |
| Category | Wheel Loader |
| Model year / production | 1971-1978 |
Full specifications
Technical details
Performance
Engine power189 hp (141 kW)
Travel speed23 mph (37 km/h)
Dimensions
Bucket width8.69 ft (2.65 m)
Transport height10 ft (3.05 m)
Transport length20.6 ft (6.29 m)
Capacity & weight
Maximum bucket capacity3.01 yd³ (2.3 m³)
Minimum bucket capacity2.22 yd³ (1.7 m³)
Weight25,871 lb (11.7 t)
Swing loaderNo
Engine & drivetrain
Cylinder bore × stroke108×120 mm
Displacement1.75 US gal (6.62 L)
Engine manufacturerJohn Deere
Number of cylinders6.0
Setup & fitment
Hydraulic quick hitchNo
Mechanical quick hitchNo
Standard tyres15.5-25. 12PR
Features
Air conditioningNo
Diesel particulate filterNo
TelescopicNo
Other specifications
Model seriesA
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