United States - English

Current number of specifications

John Deere 644K Z-Bar Wheel Loader

Selected Dimensions

G. Dump Clearance at Max Raise9.4 ft in2860 mm
A. Length with Bucket on Ground26.7 ft in8140 mm
B. Width Over Tires9.4 ft in2875 mm
C. Height to Top of Cab11.1 ft in3380 mm
D. Wheelbase10.7 ft in3260 mm
E. Ground Clearance1.3 ft in408 mm
F. Hinge Pin - Max Height13.4 ft in4070 mm
H. Reach at Max Lift and Dump3.7 ft in1120 mm


Number of Cylinders6
Model6068H, Tier III certified
Net Power232 hp173 kw
Power Measured @1700 rpm
Displacement414 cu in6.8 L
Torque Measured @1400 rpm
Max Torque
Torque Rise55 %
AspirationTurbocharged charge air cooled
Operating Weight40035.9 lb18160 kg
Fuel Capacity93 gal352 L
Hydrauilc System Fluid Capacity29.1 gal110 L
Engine Oil Fluid Capacity6.5 gal24.5 L
Cooling System Fluid Capacity7.8 gal29.5 L
Transmission Fluid Capacity6.1 gal23 L
Front Axle/Diff Fluid Capacity5.8 gal22 L
Rear Axle/Diff Fluid Capacity5.8 gal22 L
Static Tipping Weight33576.4 lb15230 kg
Turning Radius18.3 ft in5570 mm
Operating Voltage24 V
Alternator Supplied Amperage80 amps
Rear Axle Oscillation26 degrees
Tire Size23.5 R25
TypeCountershaft, powershift
Number of Forward Gears4
Number of Reverse Gears3
Max Speed - Forward22.7 mph36.6 km/h
Max Speed - Reverse15.5 mph24.9 km/h
Hydraulic System
Pump TypeVariable axial piston
Relief Valve Setting
Pump Flow Capacity81.9 gal/min310 L/min
Raise Time5.5 sec
Dump Time1.4 sec
Lower Time3 sec
Breakout Force33903 lb150.8 kN
Dump Clearance at Max Raise9.4 ft in2860 mm
Bucket Width10 ft in3040 mm
Bucket Capacity - heaped4.3 yd33.2 m3
Bucket Capacity - struck3.7 yd32.8 m3
Length with Bucket on Ground26.7 ft in8140 mm
Width Over Tires9.4 ft in2875 mm
Height to Top of Cab11.1 ft in3380 mm
Ground Clearance1.3 ft in408 mm
Wheelbase10.7 ft in3260 mm
Hinge Pin - Max Height13.4 ft in4070 mm
Reach at Max Lift and Dump3.7 ft in1120 mm