John Deere 644B Wheel Loader

Bucket

Bucket Capacity (SAE, Heaped) 2.5 yd3 (1.91 m3)
Bucket Capacity (SAE, Struck) 2.05 yd3 (1.57 m3)
Breakout Force 24120 lbf (108.11 kN)
Tipping Load, Straight (SAE) 22905 lb (10390 kg)
Tipping Load, 40° Turn 19610 lb (8895 kg)
Bucket Width 104.75 in (2660 mm)
Dump Clearance at Max Raise 112 in (2845 mm)
Hinge Pin at Max Height 144 in (3658 mm)
Reach at Max Lift and Dump 34.6 in (879 mm)
Dump Angle 45°
Rollback Angle at Ground Level 40°

John Deere 644B Wheel Loader Dimensions

Dimensions

Length w/ Bucket on Ground 252.6 in (6416 mm)
Wheelbase 104 in (2640 mm)
Height to Top of Cab 128 in (3251 mm)
Height to Top of Canopy 123 in (3124 mm)
Height to Top of Exhaust 118 in (2997 mm)
Ground Clearance 19.9 in (505 mm)

Engine Details

Number of Cylinders 6
Engine Make John Deere
Engine Model John Deere 6466A
Displacement 531 cu in (8.7 L)
Bore 4.75 in (120.5 mm)
Bore 5.00 in (127 mm)
Net Power 145 hp (108.1 kw)
Gross Power 160 hp (119.3 kw)
Power Measured @ 2200 rpm
Peak Torque 432 lb ft (586 Nm)
Torque Measured @ 1500 rpm
Aspiration Turbocharged

John Deere 644B Wheel Loader Specs

Operational Specs

Operating Weight 28100 lb (12746 kg)
Operating Voltage 12 V
Alternator 42 amps
Battery 2x 12 V, RC: 310 min

Transmission

Transmission Type Power Shift Planetary
Number of Gears 4F / 2R
Torque Converter Twin-turbine (5.03 : 1)
Max Forward Speed 25.8 mph (41.5 km/h)
Max Reverse Speed 10.2 mph (16.4 km/h)
Service Brakes Power actuated, 4-wheel, inboard-mounted wet disk. Foot-operated by either right or left pedal
Parking Brake Expanding shoe on transmission output shaft. Adjustable, hand-operated with warning light and buzzer
Rear Axle Oscillation 22°
Tire Size 20.5-25 (17.5-25 optional)
Turning Radius 185 in (4700 mm)

Hydraulic System

Loader Pump Type Independent engine-driven gear pump
Loader Pump Flow 58.2 gal/min (220 L/min)
Relief Valve Setting 2250 psi (15513 kPa)
Steering Pump Type Engine-driven, eight-piston, variable-displacement pump
Steering Pump Flow 26 gal/min (98.4 L/min)
Relief Valve Setting 2000 psi (13790 kPa)

John Deere 644B Wheel Loader Weight

Service Refill Capacities

Fuel Tank Capacity 56 gal (211.9 L)
Engine Oil Capacity (w/ Filter) 5 gal (18.9 L)
Cooling System Capacity 12.3 gal (46.4 L)
Hydraulic System Capacity 17.5 gal (66.2 L)
Transmission Oil Capacity 9.75 gal (36.9 L)
Rear Axle/Diff Fluid Capacity 6.3 gal (23.7 L)
Front Axle/Diff Fluid Capacity 6 gal (22.7 L)
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