John Deere 644K Wheel Loader

Bucket

Breakout Force 33,903 lbs (15,378 kg)
Bucket Capacity – Smallest 4 cu yd (3 cu m)
Dump Clearance at Max Raise 10 ft (3 m)
Largest bucket capacity 4 cu yd (3 cu m)

Capacities

Heaped Capacity 4 cu yd (3 cu m)
Hydraulic Tank 28 gal (105 l)
Transmission 6 gal (23 l)

Dimensions

Height – Top of Cab 11 ft (3 m)
Hinge Pin – Max Height 14 ft (4 m)
Length with Bucket on Ground 27 ft (8 m)
Reach at Max Lift and Dump 5 ft (2 m)
Turning Circle 44 ft (13 m)
Wheelbase 11 ft (3 m)
Width Over Tires 10 ft (3 m)

Driveline

Differential lock Front- Locking, Rear- Open
Parking Brake Type Wet Multi Disc – Transmission
Ride control system Optional
Service Brake – Location Axle Inboard
Service Brake Actuation Hydraulic
Service Brake Type Wet Disc
Tire size – Standard 23.5 R25

Engine

Alternator 130 amps
Displacement 549 cu in (9,001 cu cm)
Emission level Tier 4
Engine Make John Deere
Engine Model PowerTech PSS 6090
Engine Output-Net 232 hp (173 kw)
Make Deere PowerTech
Model PSX 6090
Net Power 232 hp (173 kw)
Pump Piston
Rated Speed 1700 rpm
System Voltage 24 V
Torque 783 lbs ft (1,062 nm)
Torque Rise 56%
Transmission Type Powershift

Operating Specifications

Front Axle/Diff Fluid Capacity 6 gal (22 l)
Fuel Capacity 105 gal (397 l)
Operating Weight 41,187 lbs (18,682 kg)
Rated Bucket Capacity 4 cu yd (3 cu m)
Rear Axle/Diff Fluid Capacity 6 gal (22 l)

Transmission

Pump Flow 79 gpm (297 lpm)
System Pressure 251.7 psi

Weights

Operational Weight 41,188 lbs (18,683 kg)
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