John Deere 644J High-lift Wheel Loader

Bucket

Dump Clearance At Max Raise 11.08 ft in (3380 mm)
Bucket Capacity – Heaped 4 yd3 (3 m3)
Bucket Width 9.75 ft in (2971.8 mm)
Breakout Force 30574 lb (136 kN)

Dimensions

Ground Clearance 1.5 ft in (460 mm)
Length With Bucket On Ground 28 ft in (8530 mm)
Height To Top Of Cab 11.17 ft in (3400 mm)
Wheelbase 10.5 ft in (3200 mm)
Hinge Pin – Max Height 15 ft in (4570 mm)
Reach At Max Lift And Dump 3.83 ft in (1170 mm)

Engine Details

Number Of Cylinders 6
Engine Make John Deere
Engine Model 6068H
Net Power 185 hp (138 kw)
Power Measured @ 2200 rpm
Max Torque 749 lb ft (1016 Nm)
Displacement 414 cu in (6.8 L)
Torque Measured @ 1400 rpm
Aspiration Turbocharged charge air cooled
Torque Rise 55 %

Operational Specs

Operating Weight 40620 lb (18425 kg)
Fuel Tank Capacity 93 gal (352 L)
Hydraulic System Fluid Capacity 31 gal (117 L)
Engine Oil Fluid Capacity 6.5 gal (24.5 L)
Cooling System Fluid Capacity 7.8 gal (29.5 L)
Transmission Fluid Capacity 7.1 gal (26.5 L)
Front Axle/Diff Fluid Capacity 5.9 gal (22 L)
Rear Axle/Diff Fluid Capacity 5.9 gal (22 L)
Static Tipping Weight 27689 lb (12560 kg)
Turning Radius 18 ft in (5.5 mm)
Operating Voltage 24 V
Alternator Supplied Amperage 80 amps
Rear Axle Oscillation 24 degrees
Tire Size 23.5 R25

Transmission

Transmission Type Automatic Powershift
Number Of Forward Gears 4
Number Of Reverse Gears 3
Max Speed – Forward 22 mph (35.4 km/h)
Max Speed – Reverse 15.5 mph (25 km/h)

Hydraulic System

Relief Valve Setting 3600 psi (24800 kPa)
Pump Flow Capacity 68 gal/min (257 L/min)
Raise Time 5.9 sec
Dump Time 1.9 sec
Lower Time 2.8 sec
Pump Type Variable axial piston
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