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Cummins QSK23-C860 Diesel Engine Assembly for EX1200 XE1250 Excavator

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  • QSK23-C860

  • Cummins

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The Cummins QSK23-C860 is a high-performance, 6-cylinder, inline, 4-stroke diesel engine renowned for its robust power output, exceptional durability, and superior fuel efficiency . With a substantial 23-liter (1,404 cu in) displacement and featuring turbocharged, charge-air-cooled aspiration, this engine is engineered to deliver reliable power for the most demanding industrial and heavy equipment applications . Its advanced engineering and proven performance make it a preferred choice for Original Equipment Manufacturers (OEMs) and operators in mining, oil and gas, and heavy construction sectors.

 Key Technical Specifications

Parameter Specification
Engine Model Cummins QSK23-C860
Configuration In-line, 6-Cylinder, 4-Stroke
Aspiration Turbocharged and Charge Air Cooled
Displacement 23 L (1404 cubic inches)
Bore × Stroke 6.69 in × 6.69 in (170 mm × 170 mm)
Rated Power 860 hp (641 kW) @ 2100 rpm
Peak Torque 2785 lb-ft (3776 N•m) @ 1400 rpm
Emissions Compliance EPA Tier 2, Tier 3, EU Stage IIIA, and Non-Certified configurations available
Dry Weight Approximately 6,000 lb (2,722 kg)
Coolant Capacity 48.8 U.S. qt (46.2 L)
Lube Oil Capacity 73.9 U.S. qt (69.9 L)
Note: Specifications and power ratings can vary depending on the specific model variant and application configuration. Refer to official Cummins data sheets for precise information.

Primary Applications & Equipment

The QSK23-C860 engine is built to be the powerhouse behind a vast array of heavy-duty machinery, including:

  • Well Servicing Equipment: Designed specifically for demanding oil and gas applications, providing superior uptime and productivity .

  • Mining Machinery: A reliable power source for mining equipment, offering high power density and durability in the toughest environments .

  • Heavy Construction Equipment: Ideal for large excavators, wheel loaders, dump trucks, and other heavy construction machinery .

  • Power Generation: Used in G-Drive generator sets for prime, standby, and rental power applications, with ratings up to 816 kW (standby) .

Core Technologies & Key Features

  • Advanced High-Pressure Injection (HPI) Fuel System: The QSK23 utilizes the Cummins HPI PT full authority electronic fuel system, which operates at pressures of up to 29,000 psi (141,590 kPa) . This system, managed by a high-speed Electronic Control Module (ECM), ensures optimum combustion for low emissions, excellent fuel economy, and superior engine response across the entire power curve .

  • Robust Engine Design for Longevity: Built for maximum durability, the engine features a one-piece cast-iron block with wide cylinder spacing, forged-steel crankshaft, and single-piece ferrous-cast ductile iron pistons. This robust construction provides a long service life and excellent rebuild capability, with an expected life cycle of up to 20,000 hours before first overhaul in generator set applications .

  • Efficient Turbocharging System: The engine is equipped with an HX82 turbocharger from Cummins Turbo Technologies (CTT), which utilizes exhaust energy with greater efficiency for improved emissions and fuel consumption .

  • Comprehensive Warranty and Global Support: Backed by one of the best warranties in the industry, including full coverage for unlimited hours during the first year, extending through two years or 2,000 hours . Supported by a global network of over 600 authorized distributors for parts and service .


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