The updated 550K and 650K dozers incorporate a John Deere 4.5L Final Tier 4 diesel engine with 92 horsepower and 104 horsepower, respectively. The 550K features six undercarriage rollers versus the 650K's seven, and 86 inches of track on the ground versus the 650K's 92. An efficient, friction-eliminating direct-drive fan on the 450K and 550K models is easy and less costly to maintain. A cool-on-demand variable-speed fan on the 650K runs only as needed, reducing fuel consumption, and includes an optional reversing feature to aid cooler cleanliness in high debris environments.

"The 450K, 550K and 650K are key models in the John Deere dozer lineup," said Nathan Horstman, crawler dozer product marketing manager, John Deere Construction & Forestry. "With the 450K, we focused on proven K-Series durability and fuel-saving technologies, and we updated the 550K and 650K models to offer enhanced reliability and serviceability upgrades to improve customers' operating costs."

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