Among the key figures for the John Deere Construction 644 D Wheel Loader (1985-1988) are low engine power at 156 hp (116 kW) and low minimum bucket capacity at 2.5 yd³ (1.91 m³). Its published maximum bucket capacity is 4.5 yd³ (3.44 m³).
Specification profile
Wheel Loader • 1985-1988
Engine power: 156 hp (116 kW)Maximum bucket capacity: 4.5 yd³ (3.44 m³)Minimum bucket capacity: 2.5 yd³ (1.91 m³)Travel speed: 27.3 mph (44 km/h)
156 hp (116 kW)Engine power
4.5 yd³ (3.44 m³)Maximum bucket capacity
2.5 yd³ (1.91 m³)Minimum bucket capacity
27.3 mph (44 km/h)Travel speed
480 lb-ft (651 Nm)Maximum torque
8.73 ft (2.66 m)Bucket width
9.91 ft (3.02 m)Transport height
2.02 US gal (7.63 L)Displacement
How it compares
Low, average or high?
Engine power
Low
156 hp (116 kW)
Low 44.3 hp (33 kW)Typical 212 hp (158 kW)High 814 hp (607 kW)
Engine power is well below the typical figure.
Maximum bucket capacity
Below average
4.5 yd³ (3.44 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
Low
2.5 yd³ (1.91 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
High
27.3 mph (44 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 well above the typical figure.
Maximum torque
Low
480 lb-ft (651 Nm)
Low 107 lb-ft (145 Nm)Typical 732 lb-ft (992 Nm)High 2,104 lb-ft (2,852 Nm)
Maximum torque is well below the typical figure.
Transport height
Below average
9.91 ft (3.02 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.
Working dimensions
Useful working and clearance measurements shown side by side.
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 D |
| Category | Wheel Loader |
| Model year / production | 1985-1988 |
Full specifications
Technical details
Performance
Engine power156 hp (116 kW)
Maximum torque480 lb-ft (651 Nm)
Travel speed27.3 mph (44 km/h)
Dimensions
Bucket width8.73 ft (2.66 m)
Transport height9.91 ft (3.02 m)
Outside turning radius16.5 ft (5.03 m)
Capacity & weight
Maximum bucket capacity4.5 yd³ (3.44 m³)
Minimum bucket capacity2.5 yd³ (1.91 m³)
Swing loaderNo
Engine & drivetrain
Cylinder bore × stroke116×121 mm
Displacement2.02 US gal (7.63 L)
Engine manufacturerJohn Deere
Engine type14,210,997 lb (6,446 t)
Number of cylinders6.0
Setup & fitment
Hydraulic quick hitchNo
Mechanical quick hitchNo
Standard tyres16.00-24
Features
Air conditioningNo
Diesel particulate filterNo
TelescopicNo
Other specifications
Model seriesD
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