Las Vegas (September 22, 2008) - Cummins Inc. (NYSE: CMI) sets the power standard for the largest underground mining haul trucks with the QSK19 engine installed in 60-ton payload vehicles with up to 760 hp (567 kW) output. Haul trucks powered by the 19-liter engine have demonstrated productivity increases of up to 20 percent achieved by higher capacities and faster operating cycle times. 


“Cummins long-standing success in powering surface mining haul trucks has now been followed with equally successful engine installations in the new generation of underground mining haul trucks,” said Manfred Duering, General Manager of Cummins Underground Mining Business. 


“Demand for ore and mined materials continues to grow at a rapid pace, and underground haul truck manufacturers have responded by introducing vehicles with higher payloads and faster speeds for deeper production areas accessed by ramps with steeper gradients. Cummins QSK19 engine, installed in large trucks, and the 8.9-liter QSL in low-profile trucks have proved ideally suited for underground haulage by offering more responsive performance and rugged dependability,” added Duering.


In addition to haul trucks, Cummins engines are achieving impressive productivity results in many other types of mobile underground equipment such as load-haul-dumper (LHD) vehicles, transport carriers and drill rigs as equipment manufacturers continue to upgrade their machines with cleaner, more efficient power solutions.


Cummins broad power range capability for underground mining is also reflected with the recent installation of the 30-hp (22 kW) rated A1700 engine in a rubber-tracked mini-loader with MSHA certification. Utilized for coal belt clean-up work, the remote controlled mini-loader is one of the smallest diesel-powered machines operating underground. The compact low-emissions A1700 engine has proved highly reliable while operating under arduous working conditions and maximizing productivity.


While engine performance has been an important factor behind Cummins growing presence in underground mining equipment, just as significant is Cummins ability to support and service equipment at mine sites anywhere in the world. With a global market potential, underground equipment manufacturers require the confidence provided by Cummins that engines will be fully supported wherever they are located. 


Powering Haul Trucks And LHDs


Cummins QSK19 is one of the most powerful diesel engines installed in underground mining equipment, powering haul trucks in the 50- to 60-metric ton payload class with ratings from 650 to 760 hp (485-567 kW). The six-cylinder 19-liter engine provides fast engine response with smooth power delivery to make easier work of long, steep access ramps. In terms of uptime availability and life-to-overhaul, the QSK19 has achieved impressive results while working under the most severe duty cycles. 


Some of the latest haul trucks and load-haul-dump (LHD) vehicles designed for large underground mining operations are utilizing Cummins 11-liter QSM, which comes with an outstanding reputation for heavy-duty performance and durability. Extending from 290 to 400 hp (216-298 kW), the six-cylinder QSM offers deep reserves of torque to enable faster operation for trucks with up to 30-ton capacity. For LHD applications, the QSM enables exceptional breakout force and over 14-metric ton capacity. 


The six-cylinder 8.9-liter QSL provides high power density with space-efficient packaging in the popular 20-ton capacity underground haul truck class and LHD vehicles in the 10-ton capacity range. A high-pressure common rail fuel system and advanced electronic controls work together to provide clean combustion with optimized fuel efficiency across the rpm range, contributing to lower cost-per-ton operations. 


The QSL engine features a peak power boost capability which responds to exceptionally heavy work demands. For example, the QSL rated 350 hp (261 kW) at 2100 rpm comes with a useful peak power capability of 370 hp (276 kW) at a lower 1900 rpm.


Cummins six-cylinder 6.7-liter and four-cylinder 4.5-liter QSB engines offer a perfect power match for smaller-sized low-profile haul trucks and LHDs operating in confined work areas. Both the QSB6.7 and QSB4.5 offer compact installation envelopes with the flexibility of a broad power range band from 110 to 275 hp (82-205 kW). While economical to operate, the QSB brings the premium performance of a High Pressure Common Rail fuel system and full-authority electronics usually associated with larger Cummins engines.


MSHA-Approved Power


For coal and metal/non-metal applications, the Cummins-powered Dodge Ram remains the only pickup truck produced in North America with an MSHA (Mine Safety and Health Administration) approved engine. By offering a major reduction in emissions, the specially rated 175 hp (130 kW) Cummins Turbo Diesel enables mine operators to significantly reduce their annual expenditure on mine ventilation. 


Featured on the Cummins display at MINExpo is the specially packaged 6CTAA8.3 engine which has established a growing reputation for efficient and highly dependable power in coal mine transportation locomotives, carriers and similar equipment. The MSHA-approved 6CTAA8.3 is available with ratings from 185 to 285 hp (138-213 kW). 


About Cummins


Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins serves customers in approximately 190 countries and territories through a network of more than 500 company-owned and independent distributor locations and approximately 5,200 dealer locations. Cummins reported net income of $739 million on sales of $13.05 billion in 2007.