Deere Tier 4 Final Construction-Class Dozers Feature New Electrohydraulic System

January 2, 2015

Jean L.

The 850K is the first Deere dozer to feature EcoMode, which optimizes fuel economy while maintaining ground speed by automatically adjusting engine speed and transmission settings based on load.

John Deere says its 750K and 850K crawler dozers meet Tier 4 Final emissions standards while offering higher productivity, increased uptime, and lower daily operating costs in earthmoving, waste, and grading applications.

Both the 750K and 850K (shown) come equipped with Deere’s exclusive V-Cool package that incorporates an on-demand hydraulically driven fan that isolates coolers from dust and engine heat for increased efficiency and durability.

The 750K and 850K incorporate a PowerTech 6.8-L Final Tier 4 diesel engine with 165 hp (123 kW) and 205 hp (153 kW) respectively. The 850K is the first Deere dozer to feature EcoMode, which optimizes fuel economy while maintaining ground speed by automatically adjusting engine speed and transmission settings based on load. Deere says this new feature has the potential to save customers upwards of 20% in fuel "with no loss in productivity in many applications."

DPF cleaning still occurs automatically with no impact to machine operation and it can go up to 15,000 hours before ash removal. Deere says all K-Series models feature very good overall fluid economy (diesel fuel and DEF).

The new crawler models continue to utilize hydrostatic transmissions, a feature John Deere says it pioneered in crawler dozers in North America in 1976. Updates were made to the electronic control system for improved response and controllability, increasing productivity, and enhancing the operator experience.

Machine hydraulics were updated for improved performance and responses as well as offering optional electrohydraulic (EH) controls for both the Power-Angle-Tilt and Outside Dozer blade configurations. A high flow hydraulic pump is now available for both pilot controls and the updated EH system. The EH system is more responsive to operator inputs and the machine will significantly grade better when equipped with a grade control system.

Another new feature that comes along with the new EH control system is a new color LCD display monitor. This new monitor provides enhanced onboard diagnostics with real-time values for every temperature, pressure, and speed sensor on the machine. The crawler dozers constantly monitor transmission temperature to avoid damage to the hydrostat system.

When the 750K and 850K are ordered with the new EH controls, they are grade-control ready to accept the grade control system of the customer’s choice. Deere’s open-architecture design lets customers easily employ their favorite brand of grade-control system—Trimble, Topcon, or Leica. For Topcon customers, both models can be factory-installed with a Topcon 3D-MC2 grade control system for faster availability and the ability to finance the system with the dozer purchaser.

To keep operators up and running, both the 750K and 850K come equipped with Deere’s exclusive V-Cool package. This system incorporates an on-demand hydraulically driven fan that isolates coolers from dust and engine heat for increased efficiency and durability. In addition, the V-Cool is positioned behind the heavy-duty grille and fan, making the coolers less vulnerable to the rigors of the jobsite. The coolers are also easily accessible for ground level service.

With Deere's Ultimate Uptime, operators receive pre-delivery and follow-up inspections; three years of JD Link telematics, machine heath prognostics, and remote diagnostics and programming capability; and the ability to add additional dealer-provided uptime solutions to customize the package to individual needs.