Tier 4 Excavators Offer Improved Hydraulic Efficiency, Reduced Fuel Use

Hitachi introduced the EX2600-7 and EX5600-7 excavators, the latest in the EX-7 series, to North and South America. The excavators deliver efficiency, reliability and durability improvements over predecessor competition, the company reported. Hitachi’s Fuel Consumption Optimization technologies reduce fuel consumption up to 8% to 10% versus previous models through engine options and hydraulic system improvements. For regulated countries, options include a Cummins or MTU Environmental Protection Agency (EPA) Final Tier 4 engine. For non-regulated countries, options include a Cummins or MTU engine that features fuel- calibration optimization settings.
Hydraulic efficiency improvements result in part from main pump electric regulators and a reduction in the mechanical workload to power the hydraulic pilot system. The excavators also reduce fuel consumption with a boom lower circuit regeneration and a large hydraulic oil cooler and fan that can operate at a lower speed to maintain the optimal oil temperature, the company reported. Increased reliability results in part from cylinder stroke end control, which helps ensure structural longevity and operator comfort. Angle sensors are leveraged to help reduce the cylinder pump flow rate for smoother and slower movement. The hydraulic hoses are in an underslung configuration, which makes them less prone to deflection due to decreased hose load. Contamination sensors in each main pump detect excessive contamination and alert the operator when needed.
Further enhancing durability, a pressurized cab bed protects electrical components and controllers, and an air filter keeps out dust and debris. Maintenance is reduced with a greaseless center joint that utilizes available hydraulic oil for lubrication. The excavators will hit the United States, Canadian, Latin American and Brazilian markets. Additional EX-7 Series machine launches are pending.

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