Caterpillar · Cat D-Series GC (Diesel)

Cat D500 GC

500 kW standby / 455 kW prime · Diesel · Liquid-cooled

500 kW diesel standby generator from Cat's GC value-engineered line. C15 turbocharged inline-6 with simplified controls for institutional standby.

Standby power
500 kW / 455 kW prime
Voltage options
277/480V, 346/600V
Frequency / Phase
60 Hz · 3-phase
Engine
Caterpillar C15 · 15.2L
EPA / Emissions
Tier 4 Final
standbyHealthcareCommercialmanufacturingData Centershigh-rise
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Overview#

The Cat D500 GC is a 500-kilowatt diesel standby generator from Cat's GC value-engineered line. The C15 turbocharged inline-6 (15.2L) delivers institutional-grade power for hospitals, campuses, and manufacturing facilities in a cost-optimized package.

Entering the institutional segment#

500 kW marks the transition from commercial to institutional power. The D500 GC serves facilities where reliable standby is critical — hospitals with life-safety loads, manufacturing plants with continuous processes, and large campuses. The C15's 15.2 liters provide excellent step-load performance and thermal margin.

Our service perspective#

The C15 is a major Cat engine platform with decades of field history in power generation, mining, and marine applications. The D500 GC shares all engine service procedures with the standard C15 genset. At 500 kW, cooling system integrity and fuel quality are key maintenance priorities.

Engineering specifications

Physical

Length
156 in
Width
62 in
Height
78 in
Wet weight
10,800 lb

Fuel system & runtime

Fuel use @ full load
35 GPH
Fuel use @ 75% load
26.5 GPH

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Estimate runtime for the Cat D500 GC

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

7.4 hours(0.3 days)

Fuel consumption ≈ 27.00 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 D500 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 10-second start8,760+minor
Coolant heaterCold start issues, block heater element failure10,000+minor

Frequently Asked Questions

What is the Cat D500 GC?
Cat's 500 kW value-engineered diesel generator using the proven C15 inline-6 engine (15.2L). It enters the institutional power segment where 500 kW covers hospitals, large campuses, and manufacturing facilities.
How does the D500 GC differ from the standard Cat C15 genset?
Same C15 engine platform. The standard C15 genset offers advanced paralleling, multiple prime ratings, and full EMCP 4 controller options. The D500 GC is streamlined for standalone standby — simpler controls, faster delivery, lower cost.

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