The bucket capacity for the EX5600-6 backhoe version has been increased from 29 m3 (38 cu yd) to 34 m3 (44.5 cu yd). The reach of the backhoe front attachment has been shortened and the engine output boosted to achieve higher productivity with a cycle time equivalent to the dash 5 version. The capacity for the front shovel configuration has been increased as well, from 27 m3 (35.5 cu yd) to 28 m3 (38 cu yd).
Hydraulic pump output has been increased by 10%, without degrading conventional cycle time performance. This results in the higher flow rate at the same pressure. Higher flow rate means faster speed. Pump speed is increased through a change in the pump drive gear ratio change.
The hydraulic oil cooler has been modified. A new core and additional fan speed provides better cooling capacity.
Inside the cab, LED lighting has been adopted for longer life and less heat generation. An interface with major mine management systems commonly used in many mine sites, including Wenco Fleet Management Systems, is optional.
Although the Cummins engine model number remains the same, it is a different engine configuration to provide the increased horsepower. There is now a spin-on type filter for pilot system for easier serviceability.
An exclusive auto-leveling mechanism increases crowding efficiency with one-lever control. Hitachi’s computer-aided Engine-Pump Control coaxes optimum efficiency from the engine and hydraulic pumps. This innovative system senses load demand and controls the engine and pump output for maximum operating efficiency.
For the undercarriage and hydraulic cylinder, parts common to the original EX5500-6 are used. The cab remains the same—roomy and comfortable with an air suspension seat, low-effort short-throw levers with electric fly-by-wire, and support for diagnosing the failure portion via the monitoring function of the large size LCD monitor. Provisions for extreme operating conditions, from tropical to arctic, are still available.
Also retained are the convenient 45˚ folding-type service ladder and Hitachi Global e-Service enables owners to download critical field data to their office for remote field monitoring. Complete Machine Information Center data can be downloaded in the field with a laptop. www.hitachimining.com