A completely redesigned hydraulic system has boosted performance and enhanced the multifunctioning capabilities of Deere’s new 700J-Series track feller bunchers (753J and 759J). The new hydraulic system features a load-managing system that can prioritize hydraulic flow so that each hydraulic function is capable of full torque or effort all of the time. The load-managing system sends power where it is needed the most, with up to 17% higher flow available to the feller attachment compared to previous models, thus ensuring that the saw circuit receives full power-on-demand. As a result, saw recovery time is improved and power drains from any one area of the hydraulics are avoided. The flow-compensated hydraulic system also contributes to improved fuel economy, and the increased flow helps the hydraulics run cooler and more efficiently.
J-Series hydraulic systems feature a simplified design—with 100 fewer feet of hoses and tubes and 20 fewer connections—and a cleaner layout. The simpler design and a new hydraulic pump drive gearbox also help to streamline both service and maintenance.
Boom geometry has been redesigned to provide the 700J-Series with a 50% larger cutting swath compared to previous models, which allows operators to make a wider range of strategic and productive cuts with less tracking and traveling. Enhanced boom performance heightens productivity by providing increased maneuverability and quicker cutting times.
“The enhancements to the 700J machines deliver myriad improvements—performance, reliability, and easier maintenance all have received a boost,” said Elliott Little, Product Marketing Manager for John Deere Construction & Forestry. “With the right configuration, these machines are ideal for multiple applications and terrain, including thinning, regeneration, swamps, and steep ground.”
PowerTech Plus diesel engines power the 700J-Series models. The six-cylinder, 8.1-L, Tier 2-compliant turbocharged engine delivers 241 hp (180 kW) and 907 lb·ft (1230 N·m) for both the 753J and 759J. An optional Flexxaire system—a pneumatically actuated manual switch fan—offers a reverse-blower function that clears debris that could otherwise block airflow.
Shift-Tilt technology provides the J-Series models with a stable platform for cutting on steep or difficult slopes. This technology features a four-way leveling system that allows the upper structure to shift forward by as much as 3 ft (0.9 m) to maintain its center of gravity while on an incline.