QSK23 for Construction (Tier 2)

Power 760 - 950 hp
567 - 708 kW
Torque 2558 - 2897 lb-ft
3468 - 3928 N•m
Certification Tier 2 / Stage II

Select an Application

Available Regions

US and Canada,  Russia,  Africa & Middle East,  Mexico,  Philippines,  Singapore,  Brazil,  Bolivia,  Uruguay,  Paraguay,  Argentina,  Colombia,  Central America,  Europe,  Japan,  Korea


Whether you are looking at powering new equipment or repowering an excavator, loader or road paver, the Cummins QSK23 is the answer every time. It delivers the performance and durability you need and the low maintenance and operational costs today's business climate demands.

Available from 760- through 950-hp ratings, these powerful engines come with high-tech electronic standard features for superior reliability and durability on every job. And with Cummins Advisor you can tailor the installation to take into account everything from load factors to operating climate for optimum performance.

Every QSK23 engine is covered by Cummins three-step warranty, one of the most comprehensive and simplest plans in the industry.

Smart torque across the rpm range gives the QSK23 the power to pull away quickly and maintain speed on an uphill climb, no matter how heavy the load. A high-pressure injection (HPI) fuel system injects fuel at 29,000 psi for the best fuel economy of any engine in its class, while maintaining low emissions. Plus, the QSK23 has an underplate, a floating head cover, integrated front and rear gear housing and a rear gear train, all to keep engine noise to a minimum. That's something everyone on a work site can appreciate.

Advertised Horsepower 760-950 hp 567-708 kW
Peak Torque 2401-2893 lb-ft 3255-3922 N•m
Cylinders 6
Oil System Capacity 55 U.S. qt 52 liters
Length 78.5 in 1994 mm
Width 42 in 1068 mm
Height 66.7 in 1694 mm
Weight (wet) 6,300 lb 2,858 kg
Engine Model Advertised hp (kW) @ rpm Peak Torque lb-ft (N•m) @ rpm
QSK23-950 950 (708) @ 2100 2897 (3928) @ 1400
QSK23-950 950 (708) @ 1800 2875 (3776) @ 1400
QSK23-860 860 (641) @ 2100 2785 (3776) @ 1400
QSK23-860 860 (641) @ 1880 2785 (3776) @ 1400
QSK23-760 760 (567) @ 2100 2558 (3468) @ 1350
QSK23-760*  760 (567) @ 1800  2558 (3468) @ 1350 
*Continuous Rating

Cummins QSK23 shares the proven power cylinder design of our QST30 and QSK78 engines, for reliability and durability you can count on. Every day and every year. Here are just some of the heavy-duty components that make the QSK23 an excellent choice for the largest construction equipment.

  • One-Piece Cast Iron Block - Heavy-duty design with wide cylinder spacing for long life and excellent rebuildability
  • Full-Authority Electronic Controls - Sophisticated electronic controls optimize combustion based on engine load, atmospheric conditions, even fuel quality; they also provide advanced monitoring, diagnostic and reporting capabilities, with integrated engine protection features
  • High-Pressure Injection - Works at up to 29,000 psi to optimize engine response with the best fuel economy and lowest emissions
  • Precision-Honed Cylinder Liners - Precise liner machining with superior metal technology creates exceptional surface smoothness and durability; made of ferrous cast ductile iron so that expansion and contraction won't cause excess wear
  • Ferrous Cast Ductile Iron Pistons - For even expansion and contraction during thermal cycles; the same technology found in our 3500-hp QSK78
  • Large-Diameter Camshaft - 105 mm of hardened surfaces handle high load capacities; created specifically to work with high-pressure injection systems
  • Rear Gear Train - Significantly reduces engine noise
  • Seven-Bolt Cylinder Head - Delivers increased clamping force, enabling high cylinder and injector pressures
  • Two-Stage Oil Filter - Combination full-flow and bypass oil filter reduces maintenance costs as it extends service intervals
Maintenance Intervals

Every mechanic knows, simpler is better. That's why Cummins QSK23 has an in-line 6-cylinder configuration, versus the competition's V-12.

And every foreman knows, the less time an engine spends in service, the more productive it is on the job. That's why Cummins QSK23 engines require oil and oil filter changes every 250 hours or 6 months.

When service is needed, the oil pump, water pump and accessories are all front-mounted and easy to reach.

For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

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