What is the Cat D80 GC?

The D80 GC is Cat's 80 kW value-engineered diesel generator. It uses the C4.4 turbocharged-aftercooled inline-4 — the same engine platform as the standard Cat lineup — with simplified controls optimized for standalone standby at a lower price point.

How does the D80 GC compare to the D100 GC?

Both use the same C4.4 engine platform. The D80 GC is rated 80 kW standby vs. 100 kW for the D100 GC, giving the D80 more headroom at rated load and slightly lower fuel consumption for facilities that don't need the full 100 kW.

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Caterpillar · Cat D-Series GC (Diesel)

Cat D80 GC

Name: Cat D80 GC
Brand: Caterpillar
SKU: d80-gc

80 kW standby / 72 kW prime · Diesel · Liquid-cooled

80 kW diesel standby generator from Cat's GC value-engineered line. C4.4 turbocharged engine with simplified controls for reliable commercial standby.

Cat D80 GC

Specifications & details

Standby power: 80 kW / 72 kW prime
Voltage options: 120/208V, 277/480V, 120/240V
Frequency / Phase: 60 Hz · 3-phase
Engine: Caterpillar C4.4 · 4.4L
EPA / Emissions: Tier 4 Final

standbysmall-commercialCommercialofficechurchMedia & Telecom

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Overview#

The Cat D80 GC is an 80-kilowatt diesel standby generator from Caterpillar's GC value-engineered line. The C4.4 turbocharged-aftercooled inline-4 provides proven reliability for small commercial buildings, churches, and office facilities.

The 80 kW sweet spot#

80 kW covers the essential loads of most small commercial buildings — HVAC, lighting, POS systems, and refrigeration. The D80 GC delivers this capacity from the same C4.4 platform that powers Cat's entire small-commercial generator range, with the GC line's simplified controls keeping costs down.

Our service perspective#

We service the D80 GC alongside the full C4.4 platform. Parts are interchangeable with the standard genset, and the simplified controls reduce commissioning time. At 80 kW, this unit typically runs well below its rated capacity in standby events, extending component life.

Engineering specifications

Physical

Length: 96 in
Width: 44 in
Height: 56 in
Wet weight: 3,200 lb

Fuel system & runtime

Fuel use @ full load: 6.2 GPH
Fuel use @ 75% load: 4.7 GPH

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Estimate runtime for the Cat D80 GC

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

41.8 hours(1.7 days)

Fuel consumption ≈ 4.78 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 Cat D80 GC 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: ≈ 15,000 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	Injector fouling, filter clogging	4,380+	moderate
Battery	Slow crank, failed start	8,760+	minor
Coolant heater	Cold start issues, block heater element failure	10,000+	minor
Turbocharger	Reduced power, oil in intake	15,000+	moderate

Frequently Asked Questions

What is the Cat D80 GC?: The D80 GC is Cat's 80 kW value-engineered diesel generator. It uses the C4.4 turbocharged-aftercooled inline-4 — the same engine platform as the standard Cat lineup — with simplified controls optimized for standalone standby at a lower price point.
How does the D80 GC compare to the D100 GC?: Both use the same C4.4 engine platform. The D80 GC is rated 80 kW standby vs. 100 kW for the D100 GC, giving the D80 more headroom at rated load and slightly lower fuel consumption for facilities that don't need the full 100 kW.

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