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Cat® C4.4 Marine Generator Set

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.

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Minimum Rating36.0R ekW (45 kVA)

Maximum Rating99.0 ekW (123 kVA)

Frequency50 Hz or 60 Hz

Speed1500 rpm or 1800 rpm

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

Engine ModelIn-line 4, 4-Stroke-Cycle Diesel

AspirationNA, T, TA




Governor TypeElectronic

ExcitationSeparately excited from auxiliary winding to provide 300% short circuit current up to 10 seconds


Number of Leads12 lead reconnectable

InsulationClass H

IP RatingIP23 water protection (IP44 available for certain models, contact your dealer for information)

Voltage RegulatorSolid state voltage regulator with integral voltage adjustment potentiometer




Weight805 kg (1775 lb) - 1015 kg (2338 lb)


Air cleaner, single element canister type w/ service indicator and rain cap

Dry insulated turbocharger (DIT and DITA models only)

Glowplug cold start 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)


Dry insulated turbocharger

Water-cooled exhaust manifolds


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


12 lead reconnectable

3 phase all models


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


Lubricating oil

Oil filter (LH)

Dipstick (LH)

Fumes disposal (closed system)


Steel base frame with drip pan

Anti-vibration mounts


Negative isolated ground electric system


Single side service (LH)

Keel cooled gensets do not include the keel cooler(s)


240V AC, 120V AC



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