Caterpillar · Cat D-Series GC (Diesel)

Cat D350 GC

350 kW standby / 315 kW prime · Diesel · Liquid-cooled

350 kW diesel standby generator from Cat's GC value-engineered line. C13 turbocharged inline-6 with simplified controls for commercial standby.

Standby power
350 kW / 315 kW prime
Voltage options
277/480V, 346/600V
Frequency / Phase
60 Hz · 3-phase
Engine
Caterpillar C13 · 12.5L
EPA / Emissions
Tier 4 Final
standbyCommercialHealthcaremanufacturing
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Overview#

The Cat D350 GC is a 350-kilowatt diesel standby generator that introduces the C13 engine to Cat's GC value-engineered line. The 12.5-liter inline-6 represents a significant step up in displacement, providing generous reserve capacity and strong transient response for demanding commercial applications.

C13 platform entry#

The C13 is Cat's mid-heavy diesel — 12.5 liters across six cylinders, used extensively in trucks, construction equipment, and power generation. The D350 GC brings this robust platform into the value-engineered line at 350 kW, filling the gap between the C9-based models and larger institutional generators.

Our service perspective#

The C13 is one of Cat's highest-volume engine platforms. Parts are readily available, and the inline-6 layout provides excellent access for routine service. At 350 kW, the engine runs well within its design limits, contributing to long service life.

Engineering specifications

Physical

Length
144 in
Width
58 in
Height
72 in
Wet weight
8,600 lb

Fuel system & runtime

Fuel use @ full load
24.5 GPH
Fuel use @ 75% load
18.6 GPH

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Estimate runtime for the Cat D350 GC

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

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Estimated runtime

10.6 hours(0.4 days)

Fuel consumption ≈ 18.90 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 D350 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
≈ 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.

ComponentSymptomTypical hoursSeverity
Fuel qualityInjector fouling, filter clogging4,380+moderate
TurbochargerReduced power, oil in intake, turbo noise18,000+moderate
Battery banksSlow crank, failed start8,760+minor
Coolant heaterCold start issues, block heater element failure10,000+minor

Frequently Asked Questions

What is the Cat D350 GC?
The D350 GC is Cat's 350 kW value-engineered diesel generator, introducing the C13 inline-6 engine (12.5L). The larger displacement provides excellent reserve capacity and step-load acceptance for hospitals, campuses, and manufacturing facilities.
What engine does the D350 GC use?
The Cat C13 — a 12.5-liter turbocharged-aftercooled inline-6 that's also used in Cat's on-highway trucks and heavy construction equipment. It's a proven, high-volume platform with excellent parts availability.

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