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Marine Generator Sets

Industry-leading technology allows Caterpillar to create the most reliable commercial engines for a variety of applications. From tugs and container vessels to yachts and sport fishers, Cat and MaK engines have demonstrated their efficiency countless times. With remarkable reliability and durability, these engines will exceed your expectations for decades.

Cat® C4.4 Marine Generator Set

Cat® C4.4 Diesel Marine Generator Set has three phase ratings of 50 Hertz at 38.0, 51.5, and 69.0 ekW with heat exchanger cooling and at 36.0, 49.0, and 65.0 ekW with radiator cooling that meet EU CCNR2 emissions standards. The C4.4 also has three phase ratings of 60 Hertz at 44.0, 58.5, 76.0, and 99.0 ekW with heat exchanger cooling and of 42.0, 56.0, 72.0, and 95.0 ekW with radiator cooling. C4.4 gen set is available in 12 or 24 volt as an open gen set or as an enclosed package. Single-side servicing improves ease of maintenance and lowers overall owner operating costs. The compact package size is ideal for a wide range of commercial and pleasure craft applications. These ratings also have Marine Classification Society approved packages available.

  • Specification Summary

  • Minimum Rating 36.0R ekW (45 kVA)
  • Maximum Rating 99.0 ekW (123 kVA)
  • Frequency 50 Hz or 60 Hz
  • Speed 1500 rpm or 1800 rpm
  • Specification Sheet

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Product Details

Generator Set Specifications

Minimum Rating 36.0R ekW (45 kVA)
Maximum Rating 99.0 ekW (123 kVA)
Frequency 50 Hz or 60 Hz
Speed 1500 rpm or 1800 rpm

Generator Set Configurations

Emissions EPA Tier 2 (60 Hz), EU 97/68EC Stage II (50 Hz)

Engine Specifications

Configuration In-line 4, 4-Stroke-Cycle Diesel
Aspiration NA, T, TA
Bore 105.0 mm
Stroke 127.0 mm
Displacement 4.4 L
Governor Type Electronic

Generator Specifications

Excitation Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds
Pitch 2/3
Number of leads 12 lead reconnectable
Insulation Class H
IP Rating IP23 water protection (IP44 available for certain models, contact your dealer for information)
Voltage regulator Solid state voltage regulator with integral voltage adjustment potentiometer

Generator Set Dimensions

Length 1750.0 mm
Width 1215.0 mm
Height 1000.0 mm
Weight 805 kg (1775 lb) - 1015 kg (2338 lb)
  • Air Inlet System
    •  Air cleaner, single element canister type w/ service indicator and rain cap
    •  Dry insulated turbocharger (DIT and DITA models only)
    •  Glowplug cold start system
  • Cooling System
    •  Heat exchanger cooled packages w/ Cupro-nickel tube bundle (sized for 50 o C ambient air and 32 o C sea water) or Keel cooled packages (sized for 50 o C ambient air)
    •  De-aeration expansion tank
    •  Plate-type engine oil cooler
    •  Gear driven centrifugal jacket water pump
    •  Gear driven self priming sea water pump
    •  Caterpillar Extended Life Coolant (heat exchanger cooled packages)
  • Exhaust System
    •  Dry insulated turbocharger
    •  Water-cooled exhaust manifolds
  • Dry insulated turbocharger
    • Water-cooled exhaust manifolds
      • Fuel System
        •  Primary fuel filter / water separator w/ NPT and BSP connectors (ship loose)
        •  Secondary fuel filter (LH)
        •  Fuel priming pump electric
        •  Energize to run shutoff solenoid
      • Primary fuel filter / water separator w/ NPT and BSP connectors (ship loose)
        • Secondary fuel filter (LH)
          • Fuel priming pump electric
            • Energize to run shutoff solenoid
              • Generator
                •  12 lead reconnectable
                •  3 phase all models
                •  Brushless
                •  Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds
                •  2/3 pitch
                •  Broad voltage band
                •  IP23 water protection
                •  Solid state voltage regulator w/ integral voltage adjustment potentiometer
                •  Class H insulation
                •  Connection poles
              • 12 lead reconnectable
                • 3 phase all models
                  • Brushless
                    • Separately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds
                      • 2/3 pitch
                        • Broad voltage band
                          • IP23 water protection
                            • Solid state voltage regulator w/ integral voltage adjustment potentiometer
                              • Class H insulation
                                • Connection poles
                                  • Lube System
                                    •  Lubricating oil
                                    •  Oil filter (LH)
                                    •  Dipstick (LH)
                                    •  Fumes disposal (closed system)
                                  • Mounting System
                                    •  Steel base frame with drip pan
                                    •  Anti-vibration mounts
                                  • Starting/Charging System
                                    •  Negative isolated ground electric system
                                  • Negative isolated ground electric system
                                    • General
                                      •  Single side service (LH)
                                      •  Keel cooled gensets do not include the keel cooler(s)
                                    • On-board spars and tool kit
                                      • AC circuit breaker
                                        • Siphon break
                                          • Instrumentation
                                            • Duplex secondary fuel filter
                                              • Governor droop kit (enables paralleling with appropriate customer supplied switchgear)
                                                • Remote expansion tank kit
                                                  • Double wall fuel lines and mounted alarm reservoir
                                                    • Flexible fuel lines
                                                      • Primary fuel filter with water separator
                                                        • Space heater kit
                                                          •  240V AC, 120V AC
                                                        • Remote start/stop panels
                                                          • Air starter
                                                            • Jacket water heater
                                                              Built for it