Engineering & Mining Journal

MAY 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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74 E&MJ • MAY 2019 EQUIPMENT GALLERY Hitachi introduced the EX2600-7 and EX5600-7 excavators, the latest in the EX-7 series, to North and South America. The excavators deliver effi ciency, reliability and durability improvements over prede- cessor competition, the company reported. Hitachi's Fuel Consumption Optimiza- tion technologies reduce fuel consump- tion up to 8% to 10% versus previous models through engine options and hy- draulic system improvements. For regulated countries, options include a Cummins or MTU Environmental Protec- tion Agency (EPA) Final Tier 4 engine. For non-regulated countries, options include a Cummins or MTU engine that features fu- el-calibration optimization settings. Hydraulic effi ciency improvements result in part from main pump electric regulators and a reduction in the me- chanical workload to power the hydraulic pilot system. The excavators also reduce fuel consumption with a boom lower cir- cuit 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 oper- ator comfort. Angle sensors are leveraged to help reduce the cylinder pump fl ow rate for smoother and slower movement. The hydraulic hoses are in an underslung confi guration, which makes them less prone to defl ection 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 fi lter keeps out dust and debris. Mainte- nance is reduced with a greaseless cen- ter 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. Tier 4 Excavators Offer Increased Power Komatsu America Corp. introduced the PC1250SP-11 and PC1250LC-11 Tier 4 fi nal emissions-certifi ed hydraulic exca- vators. The excavators feature improved operator comfort, increased power, higher production, and a new operating mode, called Power +, which does not affect fuel consumption, the company reported. The excavators have SAA6D170E-7 engines with two Komatsu Diesel Par- ticulate Filters that do not require diesel exhaust fl uid or a selective catalyst reduc- tion system. Other features include the KomVision 4 camera system, Auto Idle and Auto Idle Shutdown, KOMTRAX Plus Version 2 for machine health monitoring, integrated tie-off anchor points, and a hy- draulically powered ladder. Komatsu CARE comes standard. The service provides factory maintenance for a set period. Separately, Komatsu and MineWare released Argus PLM, a payload manage- ment system for Komatsu excavators. Tier 4 Excavators Offer Improved Hydraulic Effi ciency, Reduced Fuel Use

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