G3520 Gas Generator Sets, Oil & Gas

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Emissions/Fuel StrategyU.S. EPA Large S.I. Tier 2 / Non-Road Mobile Certified
Bore6.7 in (170 mm)
Stroke8.5 in (215 mm)
Production of oil and gas in remote oilfields can be a challenge when utility power is not available. The Caterpillar product line of oilfield gas generator sets provides the ideal solutions for this challenge. Engines are designed to run on low to no-cost well site gas without sacrificing on performance. These generator sets allow customers to significantly reduce fuel cost and avoid the expense and logistics of diesel fuel deliveries. Plus, they are designed to withstand the harsh conditions in the oilfield and feature a heavy-duty construction ideal for loading and unloading operations.Cat generator sets are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty.


Emissions/Fuel StrategyU.S. EPA Large S.I. Tier 2 / Non-Road Mobile Certified
Bore6.7 in (170 mm)
Stroke8.5 in (215 mm)
Displacement5956 in³ (97.6 l)
Engine Control and ProtectionElectronic (ADEM 4)
Generator Set ControlEMCP 4 Control Panels
Length336 in (8534 mm)
Width94 in (2386 mm)
Height128 in (3230 mm)
Weight48501 lb (22000 kg)
Frequency - Speed60 Hz
Fuel SystemElectronic Fuel Control Valve
Compression Ratio11.5:1

Benefits and Features

U.S. EPA Large S.I. Tier 2* Certification / Non-Road Mobile Certified. Robust 20 cylinder high speed block design provides prolonged life and lower owning and operating costs.Designed for maximum performance on low pressure gaseous fuel supply

Conforms to ISO 8528-5 G2 load acceptance criteria. Reliability verified through torsional vibration, fuel consumption, oil consumption, transient performance, and endurance testing.

Superior motor starting capability minimizes need for oversizing generator. Designed to match performance and output characteristics of Cat engines.

Operational radiator available to operate in ambient temperatures up to 43°C (110°F). Package tested to ensure proper cooling of complete generator set.

User-friendly interface and navigation. Scalable system to meet a wide range of installation requirements. Expansion modules and site specific programing for specific customer requirements.

Standard Equipment

  • Two single-stage air-cleaners with differential pressure sensors
  • Remote mounted Electronic Modular Control Panel 4.3 (EMCP 4.3)
  • Aftercooler water pump, gear driven, centrifugal, non-self-priming, Thermostats and housing (full open temperature 98 C (208 F)).
  • Jacket water pump, gear driven, centrifugal, non-self-priming.
  • Jacket Water Outlet - Installed LH Flange Connection
  • Flywheel; SAE No. 21
  • Flywheel housing; SAE No. 00
  • SAE standard rotation
  • Standard Pressure Gas Train, NFPA 37
  • Paint - Caterpillar Yellow except rails Gloss Black rails.
  • Generator - PM excited SR5 generator with space heater Form wound VPI copper RTDs and Caterpillar's Digital Voltage Regulator (CDVR).
  • No Extension Box.
  • ADEM A4 speed governor with 4 to 20 ma (0V to 5V) speed input.
  • Adem IV (includes detonation sensitive timing)
  • EMCP 4.3 provides power metering, protective relaying, enhanced engine monitoring and Modbus Communications as standard plus an 8-line graphical screen, additional I/O, and Ethernet (Modbus TCP).
  • Kit, Serialized Technical Media Includes Operation & Maintenance manual (in language of choice), Parts book on Compact Disc (English only) and other required technical documents. One group shipped free of charge with each engine. Any additional media or translations not included in the literature kit, should be ordered through the CSS Media Online Ordering Site
  • Prelube Pump
  • Crankcase Breather
  • Oil Cooler
  • Simplex Oil Filter
  • Standard Oil Pan (Shallow)
  • Oil drain lines and valve
  • No Lubricating Oil
  • Base; engine-generator mounting
  • Triple Electric Starter
  • 208V Single Jacket Water Heater
  • Detonation shutdown

Optional Equipment

  • No Charging Alternator provided
  • Remote mounted Electronic Modular Control Panel 4.4 (EMCP 4.4)