G3306B Oilfield Gas Generator Set

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.G3306B oilfield gas generator set. Ratings: 110 – 135 ekW (138 – 170 kVA) @ 50 and 60 Hz (1500 and 1800 rpm). Configurations available to meet NSPS emission standards in non-attainment areas and configurations available for non-regulated areas.

Engine Specifications

Maximum Rating 135 ekW (170 kVA)
Minimum Rating 110 ekW (138 kVA)
Emissions/Fuel Strategy NSPS or non-regulated
Aspiration Turbocharged-Aftercooled
Manifold Type Watercooled
Bore 4.76in
Stroke 5.98in
Displacement 640in³
Engine Control and Protection ADEM A4
Generator Set Control EMCP 4.3 (4.4 optional)
Generator SR4B
Frequency - Speed 50/60 Hz (1500/1800 rpm)

Capacity for Liquids

Fuel CNG, LNG, field gas, natural gas
Lube Oil System - Refill 12gal (US)
Cooling System - Engine 5gal (US)


Length 145.8in
Width 60.2in
Height 73.1in
Weight 7716lb

Standard Equipment

  • Air Inlet System
    • Air cleaner — intermediate duty, dry
    • Air cleaner rain cap
    • Air cleaner service Indicator
  • Cooling System
    • High ambient radiator design for gas fuel applications
    • Side-by-side aftercooler and jacket water core
    • Metal top and bottom tanks
    • Coolant drain
    • Fan and belt guard
    • Coolant level sensor
  • Exhaust System
    • Exhaust manifolds — water cooled
    • Exhaust elbow and flex fitting — 127 mm (5 in)
    • Residential grade muffler
  • Fuel System
    • Gas pressure regulator — requires 82.7-172.4 kPa (12-25 psi) gas
    • Natural gas carburetor
  • Generator
    • Rated for continuous duty — 25% oversize
    • Class H insulation
    • Permanent magnet
    • Random wound
    • 240 VAC space heater
    • Coastal insulation protection
    • IP23 protection
    • Cat Digital Voltage Regulator
  • Control System
    • Electronic governing ADEM A4
    • Electronic diagnostics and fault logging
    • Momentary start/stop logic
    • High temperature braided engine harness with 70-pincustomer connector and service tool connector
  • Lube System
    • Crankcase breather, top-mounted
    • Oil filter, spin-on, left-hand service
    • Dipstick, left-hand service
    • Oil pump — gear-driven
    • Oil cooler
  • Mounting System
    • Heavy-duty welded steel base designed for the oilfield
    • Designed to accommodate a drop-over enclosure
    • Space claims for makeup tank and coalescing filter
    • Base design optimized for loading, transport, and unloading
  • Protection System
    • The following parameters include alarm and shutdown:
  • General
    • Jacket water heater
    • 24V starting motor
    • 24V, 45-amp charging alternator

Optional Equipment

  • Exhaust System
    • Three-way catalyst
    • Critical grade muffler
    • Muffler mounting structure
  • Fuel System
    • Air-fuel ratio control
    • Coalescing filter, heavy-duty for wellhead gas