The John Deere 644H is a wheel loader designed for material handling, stockpiling, loading, and general construction work. It is part of John Deere's H-series loader lineup and is commonly used in aggregate yards, roadbuilding, site preparation, and industrial applications. The 644H features a front-mounted bucket, articulated steering, and a diesel powertrain suited to repetitive loading cycles. Typical configurations include general-purpose, light material, and heavy-duty buckets, along with optional attachments for specialized tasks. Known for its balance of lift capacity, breakout force, and maneuverability, the 644H remains a recognized mid-size wheel loader in the used equipment market.
Bucket
John Deere 644H Wheel Loader Bucket specifications
Breakout Force
28,976.00 lbs (13,143.31 kg)
Bucket Capacity - heaped
4.30 cu yd (3.29 cu m)
Bucket Capacity - struck
3.80 cu yd (2.91 cu m)
Dimensions
John Deere 644H Wheel Loader Dimensions specifications
Dump Clearance at Max Lift
9.00 ft (2.74 m)
Fork Tine Length
5.10 ft (1.55 m)
Ground Clearance
1.60 ft (0.49 m)
Height - Top of Cab
11.20 ft (3.41 m)
Hinge Pin Max Height
13.60 ft (4.15 m)
Length w/ Bucket on Ground
27.20 ft (8.29 m)
Length with out Forks on Ground
28.40 ft (8.66 m)
Max Lift Height
12.90 ft (3.93 m)
Reach at Max Height and Dump
3.80 ft (1.16 m)
Wheelbase
10.50 ft (3.20 m)
Width Over Tires
9.50 ft (2.90 m)
Engine
John Deere 644H Wheel Loader Engine specifications
Aspiration
Turbocharged
Displacement
496.00 cu in (8,128.00 cu cm)
Engine Model
6081H
Gross Power
180.00 hp (134.23 kw)
Max Torque
755.00 lbs ft (1,023.63 nm)
Net Power
221.00 hp (164.80 kw)
Number of Cylinders
6
Power Measured @
2200 rpm
Torque Measured @
1300 rpm
Torque Rise
75%
Hydraulic System
John Deere 644H Wheel Loader Hydraulic System specifications
Dump Time
1.4 seconds
Lower Time
3 seconds
Pump Flow Capacity
68.00 gpm (257.38 lpm)
Pump Type
Piston Pump
Raise Time
6.2 seconds
Relief Valve Setting
3600 psi
Operating Specifications
John Deere 644H Wheel Loader Operating Specifications specifications
Alternator Supplied Amperage
55 amps
Fuel Capacity
100.00 gal (378.50 l)
Operating Voltage
24 volts
Operating Weight
38,876.00 lbs (17,633.88 kg)
Rear Axle Oscillation
26 degrees
Static Tipping Load - Bucket
31,210.10 lbs (14,156.68 kg)
Static Tipping Load - Forks
22,782.00 lbs (10,333.75 kg)
Tire Size
23.5-25
Turning Radius
18.10 ft (5.52 m)
Transmission
John Deere 644H Wheel Loader Transmission specifications
Max Speed Forward
22.00 mph (35.41 kph)
Max Speed Reverse
15.50 mph (24.94 kph)
Number of Forward Gears
4
Number of Reverse Gears
3
Transmission Type
Power Shift
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