visibility for the operator
• Limited electronics and easy accessibility for repair and maintenance work.
Page 23
Contractors World - International Vol 4 No 3
The All New John Deere 644K
Hybrid Loader
he new 644K Hybrid Wheel Loader from John Deere is now available for customers looking to lower
owning and operating costs. The 644K Hybrid utilizes two sources of energy: diesel and electric. The hybrid
loader captures regenerated energy as it’s being created and uses it to power the machine.
“John Deere is committed to delivering the right hybrid solutions to meet our customer needs today, tomorrow
and well into the future,” said Andrew Kahler, engine and driveline product marketing manager, John Deere
Construction & Forestry. “The 644K Hybrid is a result of our dedication to integrating the best technology available
to better the industry and provide our customers superior uptime and productivity, while lowering daily operating
The 644K Hybrid is equipped with a John Deere PowerTech 6.8-L IT4/Stage IIIB engine that runs at an operator-
selected constant speed from 900 to 1,800 rpm. The hybrid boasts a net 229 hp and is equipped with all the key
features of the conventional John Deere K-Series Wheel Loader line.
The machine’s hybrid technology delivers performance that is equal to or better than the conventional 644K,
depending on the application. The engine’s constant operating speed maintains continuous hydraulic flow at all
times, which delivers crisp hydraulic responsiveness and reduces cycle times. The electric motor smoothly delivers
torque resulting in fluid operation and a smoother ride.
“With fuel prices on the rise, the 644K Hybrid can reduce fuel consumption up to 25 percent, helping contractors
lower their daily operating costs,” said John Chesterman, global product marketing manager for 4WD loaders, John
Deere Construction & Forestry.
Another benefit of the hybrid design is noise reduction on the jobsite. Since the engine runs at a constant speed
instead of increasing and decreasing speed as the machine is worked, the engine noise is continuous and therefore
less noticeable to both the operator inside the cab and bystanders outside.
It has four operating speed ranges, but no reverse gear or clutches as direction changes are performed by the
electric motor. Four main components pace the 644K’s electric-drive technology – the generator, inverter, motor
and brake resistor.
What’s New in Plant & Equipment
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