The John Deere 644G is a wheel loader designed for material handling, loading, stockpiling, and general construction applications. It is part of John Deere's G-series wheel loader lineup and is commonly used in aggregate yards, roadbuilding, site preparation, and industrial material movement. The 644G features a front-mounted bucket, articulated steering, and a diesel powertrain suited for loader duty cycles. Typical configurations include standard and high-lift arrangements, with compatibility for a range of buckets and attachments. The model is recognized for its use in earthmoving and loading operations where maneuverability, breakout force, and cycle efficiency are important.
Bucket
John Deere 644G Wheel Loader Bucket specifications
Breakout Force
35,317.00 lbs (16,019.54 kg)
Bucket Capacity - Heaped
3.8 cu yd
Bucket Capacity - Struck
3.2 cu yd
Dimensions
John Deere 644G Wheel Loader Dimensions specifications
Dump Clearance At Max Lift
9.42 ft (2.87 m)
Fork Tine Length
4.51 ft (1.37 m)
Ground Clearance
1.59 ft (0.48 m)
Height
11.17 ft (3.40 m)
Height To Top Of Cab
11.23 ft (3.42 m)
Hinge Pin Max Height
13.13 ft (4.00 m)
Hook Height At Max Lift - Extended
22.92 ft (6.99 m)
Hook Height At Max Lift - Standard
18.81 ft (5.73 m)
Hook Reach At Max Lift - Extended
11.58 ft (3.53 m)
Hook Reach At Max Lift - Standard
6.87 ft (2.09 m)
Length
25.58 ft (7.80 m)
Length W/ Bucket On Ground
25.69 ft (7.83 m)
Length With Out Forks On Ground
27.19 ft (8.29 m)
Max Lift Height
12.53 ft (3.82 m)
Reach At Max Height And Dump
3.74 ft (1.14 m)
Weight
35,500.00 lbs (16,102.55 kg)
Wheelbase
10.50 ft (3.20 m)
Width
9.00 ft (2.74 m)
Width Over Tires
9.00 ft (2.74 m)
Engine
John Deere 644G Wheel Loader Engine specifications
Aspiration
Turbocharged w/ Aftercooler
Displacement
466.00 cu in (7,636.39 cu cm)
Engine Make
2240
Engine Model
6076A
Gross Power
178.00 hp (132.74 kw)
Max Torque
598.00 lbs ft (810.77 nm)
Net Power
170.00 hp (126.77 kw)
Number Of Cylinders
6
Power Measured @
2200 rpm
Torque Measured @
1300 rpm
Hydraulic System
John Deere 644G Wheel Loader Hydraulic System specifications
Dump Time
1.8 sec
Lower Time
3.5 sec
Pump Flow Capacity
69.50 gpm (263.06 lpm)
Pump Type
Gear
Raise Time
6.2 sec
Relief Valve Setting
3000 psi
Operational
John Deere 644G Wheel Loader Operational specifications
Alternator Supplied Amperage
95 amps
Cooling System Fluid Capacity
7.60 gal (28.77 l)
Engine Oil Capacity
6.40 gal (24.22 l)
Front Diff Fluid Capacity
7.60 gal (28.77 l)
Fuel Capacity
75.00 gal (283.88 l)
Hydraulic System Fluid Capacity
30.40 gal (115.06 l)
Operating Voltage
12 V
Operating Weight
35,236.00 lbs (15,982.80 kg)
Rear Axle Oscillation
26 degrees
Rear Diff Fluid Capacity
7.60 gal (28.77 l)
Static Tipping Load - Bucket
26,228.00 lbs (11,896.84 kg)
Static Tipping Load - Forks
18,251.00 lbs (8,278.52 kg)
Static Tipping Load - Material Handler
13,290.00 lbs (6,028.25 kg)
Tire Size
20.5-25
Transmission Fluid Capacity
3.70 gal (14.00 l)
Turning Radius
18.00 ft (5.49 m)
Transmission
John Deere 644G Wheel Loader Transmission specifications
Max Speed Forward
21.50 mph (34.60 kph)
Max Speed Reverse
13.70 mph (22.05 kph)
Number Of Forward Gears
4
Number Of Reverse Gears
3
Transmission Type
Power Shift
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