John Deere 644D Wheel Loader

Bucket

Bucket Capacity, Heaped 3.0 yd3 (2.3 m3)
Bucket Capacity, Struck 2.5 yd3 (1.9 m3)
Bucket Width 104.7 in (2660 mm)
Hinge Pin – Max Height 152 in (3862 mm)
Reach At Max Lift And Dump 36.7 in (933 mm)
Dump Clearance At Max Raise 117 in (2970 mm)
Breakout Force 24430 lbf (109 kN)
Tipping Load 25210 lb (11435 kg)
Max Lift Capacity at Max Height 14680 lb (6660 kg)
Max Lift Capacity at Ground Level 31325 lb (14210 kg)

John Deere 644D Wheel Loader Specs and Dimensions

Dimensions

Length w/ Bucket On Ground 277 in (7035 mm)
Width Over Tires 102.6 in (2605 mm)
Height to Top of Cab 126 in (3200 mm)
Wheelbase 115 in (2920 mm)
Ground Clearance 20.2 in (514 mm)

Engine Details

Number Of Cylinders 6
Engine Make John Deere
Engine Model John Deere 6-466T
Displacement 466 cu in (7.7 L)
Net Power 155 hp (116 kw)
Gross Power 165 hp (123 kw)
Power Measured @ 2200 rpm
Max Torque 480 lb ft (651 Nm)
Torque Measured @ 1400 rpm
Aspiration Turbocharged

Operational Specs

Operating Weight 29320 lb (13300 kg)
Max Operating Weight (Multipurpose Bucket) 30270 lb (13730 kg)
Operating Voltage 12 V
Alternator 42 amps
Battery 2x 12 V, CCA 625
Rear Axle Oscillation 22°
Tire Size 16.00-24, 12 PA, grader tread, G2
20.5-25, 12 PA, rock tread, L3
20.5-25, 12 PR, loader tread, L2 wi or wo valve stem protector
20.5-25, 16 PA, rock tread, L3 w/stem protector
20.5-25 XRAT
23.5-25, 20 PR, rock tread, L3 w/valve stem protector
Turning Radius 16.6 ft (5030 mm)

Transmission

Transmission Type Power shift planetary
Number Of Forward Gears 4
Number Of Reverse Gears 2
Max Forward Speed 27.3 mph (43.9 km/h)
Max Reverse Speed 8.2 mph (13.2 km/h)
Service Brakes Power-actuated, 4-wheel inboard-mounted, wet disk. Foot-operated by either pedal
Parking Brake 10 x 1.5 in (254 x 38 mm) expanding shoe on transmission, output shaft, foot-operated. Includes transmission disconnect with warning light and buzzer

Hydraulic System

Pump Type Gear type pump
Pump Flow Capacity 63 gal/min (238.5 L/min)
Relief Valve Setting 2625 psi (18099 kPa)
Raise Time 6.1 sec
Dump Time 2.0 sec
Lower Time 4.3 sec

Service Refill Capacities

Fuel Tank Capacity 67 gal (254 L)
Engine Oil Capacity (w/ Filter) 5.1 gal (19 L)
Cooling System Capacity 7.4 gal (28 L)
Hydraulic System Capacity 25.1 gal (95 L)
Transmission Oil Capacity 9.8 gal (37 L)
Front Axle/Diff Fluid Capacity 6.1 gal (23 L)
Rear Axle/Diff Fluid Capacity 6.1 gal (23 L)
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