The Cummins C110 D6 is a 112 kW / 140 kVA standby diesel generator set in the Cummins commercial lineup. It uses the 6BT5.9-G6 engine — a 5.9-liter, 6-cylinder inline, turbocharged and charge-air-cooled diesel running at 1800 rpm (60 Hz). Prime rating is 102 kW / 128 kVA.
The 6BT5.9 platform is one of the most common engine blocks we service in the Cummins commercial diesel lineup. Parts availability is excellent, and the engine is well-documented. The 5.9-liter inline-6 is a proven workhorse across the 80-150 kW range of Cummins generator sets.
Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.
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
27.3 hours(1.1 days)
Fuel consumption ≈ 7.33 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 C110 D6 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Air filter
Every 500 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours
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
6BT5.9 charge air cooler
Coolant in intake, white smoke at startup, loss of power
Oil seepage at filter base, low oil pressure warning
—
minor
Frequently Asked Questions
What are the power ratings of the Cummins C110 D6?
The C110 D6 is rated for 112 kW / 140 kVA standby and 102 kW / 128 kVA prime at 60 Hz (1800 rpm). It uses the Cummins 6BT5.9-G6 engine.
What engine does the Cummins C110 D6 use?
The C110 D6 uses the Cummins 6BT5.9-G6 engine -- a 5.9-liter, 6-cylinder inline, turbocharged and charge-air-cooled diesel running at 1800 rpm.
Can OnPoint Generators service Cummins diesel generators in this power range?
Yes. OnPoint Generators serves the San Francisco Bay Area, Silicon Valley, and broader Northern California with authorized Cummins service. We carry 6BT5.9 parts and provide annual maintenance, load bank testing, and emergency response for the entire 80-125 kW Cummins diesel range.
