John Deere 644B Wheel Loader

Bucket

Dump Clearance At Max Raise 9.33 ft in (2843.79 mm)
Breakout Force 24120 lb (108.11 kN)
Bucket Capacity – Heaped 2.5 yd3 (1.91 m3)
Bucket Capacity – Struck 2.05 yd3 (1.57 m3)
Bucket Width 8.73 ft in (2660 mm)

Dimensions

Ground Clearance 1.66 ft in (505 mm)
Length With Bucket On Ground 21.1 ft in (6042 mm)
Height To Top Of Cab 10.63 ft in (3240.03 mm)
Wheelbase 8.67 ft in (2640 mm)
Hinge Pin – Max Height 12 ft in (3657.6 mm)
Reach At Max Lift And Dump 2.89 ft in (879 mm)

Engine Details

Number Of Cylinders 6
Engine Make John Deere
Net Power 145 hp (108.1 kw)
Gross Power 160 hp (119.3 kw)
Power Measured @ 2200 rpm
Max Torque 432 lb ft (586 Nm)
Displacement 531 cu in (8.8 L)
Torque Measured @ 1500 rpm
Aspiration Turbocharged

Operational Specs

Operating Weight 28100 lb (12746 kg)
Fuel Tank Capacity 56 gal (211.9 L)
Hydraulic System Fluid Capacity 17.5 gal (66.3 L)
Engine Oil Fluid Capacity 5.5 gal (20.9 L)
Cooling System Fluid Capacity 12.3 gal (46.4 L)
Transmission Fluid Capacity 9.8 gal (37 L)
Front Axle/Diff Fluid Capacity 6 gal (22.7 L)
Rear Axle/Diff Fluid Capacity 6.3 gal (23.7 L)
Static Tipping Weight 22905 lb (10390 kg)
Turning Radius 15.5 ft in (4700.1 mm)
Operating Voltage 12 V
Alternator Supplied Amperage 42 amps
Rear Axle Oscillation 22 degrees
Tire Size 14.5-25 / 20.5-25

Transmission

Transmission Type Power shift Planetary
Number Of Forward Gears 4
Number Of Reverse Gears 2
Max Speed – Forward 25.8 mph (41.5 km/h)
Max Speed – Reverse 10.2 mph (16.4 km/h)

Hydraulic System

Relief Valve Setting 2250 psi (158.2 kPa)
Pump Flow Capacity 58.2 gal/min (220 L/min)
Pump Type Gear
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