700 kW standby / 600 kW prime diesel generator. Cummins QSK19 inline-6 19L platform for medium hospitals, large campuses, industrial, and paralleling applications.
The Cummins QSK19 (C700 D5) is a 700-kilowatt standby diesel generator built on a 19-liter inline-6 engine in the QSK high-output series. It serves medium hospitals, large campuses, and major commercial facilities requiring reliable standby power in the 600–700 kW range — bridging the gap between the mid-range QSL9 platform and the larger QSK23.
The QSK19's 19-liter displacement delivers high power density from an inline-6 configuration, with Cummins' MCRS fuel injection and turbocharged-aftercooled air handling ensuring consistent full-load performance. The 4.16 kV medium-voltage alternator option makes it suitable for facilities with medium-voltage distribution infrastructure.
The QSK19 is a solid mid-large platform for hospital and campus accounts. The QSK engine family's MCRS fuel system requires clean, high-quality diesel — fuel polishing and annual sampling are standard parts of our maintenance program for these units. Load bank testing at or near full rated output is critical: a 700 kW unit that hasn't been properly load-tested may not perform as needed when an actual outage demands full capacity.
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Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Estimated runtime
5.3 hours(0.2 days)
Fuel consumption ≈ 37.80 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.
Service intervals
Manufacturer-recommended intervals for the Cummins QSK19 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Coolant change
Every 6000 hours
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours
Load bank test
Every 12 months
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Fuel quality (standby degradation)
Injector fouling, filter clogging, hard starting
4,380+
moderate
Turbocharger(s)
Reduced power, excessive smoke, turbo noise
18,000+
moderate
Starting system (24V battery banks)
Slow crank, failed start requirement
8,760+
minor
Frequently Asked Questions
How does the QSK19 fit between the QSL9 and QSK23?
The QSK19 (700 kW standby, 19L I6) sits between the QSL9 (400 kW standby, 8.9L I6) and QSK23 (800 kW standby, 23L I6). For facilities in the 600–700 kW standby range, the QSK19 is the natural single-unit solution, providing more headroom than the QSL9 while avoiding the cost step-up to the larger 23L engine.
What distinguishes the QSK engine family from the QSL platform?
The QSK family (QSK19, QSK23, QSK38, QSK50, QSK60) is Cummins' purpose-built high-output series for the most demanding standby and prime power applications. The QSL platform (QSL9) is a mid-range industrial diesel. QSK engines use Cummins' MCRS high-pressure fuel injection and are designed for higher continuous power densities and longer overhaul intervals.
Can the QSK19 support 4160V distribution?
Yes. The QSK19 is available with a 4.16 kV medium-voltage alternator for direct connection to 4160V distribution systems, eliminating the need for a step-up transformer in facilities with established medium-voltage infrastructure.
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