Caterpillar
Caterpillar CG18
CG
Caterpillar CG18 is an 18.1 L inline-6 turbocharged and air-to-air aftercooled natural-gas engine for 60 Hz generator sets. The official Cat DG500 specification lists 500 kWe standby at 1800 RPM and EPA stationary emergency and non-emergency compliance; EPA annual certification data lists 567 kWm.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-25
- Package route
- gas generator sets
- Standby Power · 60 Hz
- 625 kVA
- Electrical Output
- 500 kWe
- Cylinders
- L6
- Displacement
- 18.1 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Standby Power | — | 500 | 625 |
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Caterpillar CG18 overhaul & repair parts
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Caterpillar CG18 generator set context
The Caterpillar CG18 is listed here as a natural gas generator-drive engine for 60 Hz generator sets, with a headline 625 kVA / 500 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Caterpillar |
| Model | CG18 |
| Series | CG |
| Configuration | L6 Turbocharged Air-to-Air Aftercooled |
| Cylinders | 6 |
| Displacement | 18.1 L |
| Compression Ratio | 10.5:1 |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | U.S. EPA Stationary Emergency, U.S. EPA Stationary Non-Emergency |
| Country of Origin | United States |
Frequently asked questions
What is the power output of the Caterpillar CG18?
The Caterpillar CG18 is rated at 625 kVA standby at 60 Hz (1,800 rpm).
Does the CG18 run at 50 Hz or 60 Hz?
The Caterpillar CG18 is rated for 60 Hz (1,800 rpm).
What fuel does the Caterpillar CG18 use?
The Caterpillar CG18 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the CG18?
The Caterpillar CG18 is an inline-6 (6-cylinder) engine with a displacement of 18.1 L.
What emissions information is listed for the CG18?
This record lists U.S. EPA Stationary for the Caterpillar CG18. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Caterpillar CG18?
The Caterpillar CG18 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the CG18?
This page links reference documents for the Caterpillar CG18. Check each document's title, model coverage, revision and rating conditions before using it for selection.