CM20C Generator Set


Reliable Operation

  • Intensive cooling of key components including exhaust valve seats, injector cooling integrated into lube oil system
  • Reliable, proven and high efficient single turbo charging system
  • Classification society standards ensure high safety and quality
  • Intelligent simplicity ensures a robust engine platform
  • Optimized service schedules enable high availability and long durability

Control & Monitoring

  • Ultrafast start time and load acceptance
  • No engine start limitations
  • Continuous power (base and peak load), prime power, stand-by
  • Part load with high efficiency
  • Monitoring for unattended operation
  • Asset intelligence system

Ease Of Installation

  • Reduced complexity of standard modular design allows an easy installation
  • Low space requirements between the gensets
  • Genset is ready for installation
  • Generator set designed for direct elastic mounting

Ease Of Operation

  • Low fuel and oil consumption
  • Low maintenance requirements
  • Operator and maintenance training courses available

Intelligent Simplicity

  • High reliability, modular design and integral construction reduce the number of components by 40% over conventional designs e.g.:

     - Dry engine block with integrated ducts for lubricating oil and charge air and underslung crankshaft

     - Compact cylinder head design
  • Smart maintenance solutions:

     - Easily removable cylinder heads, quick removable fluid connections

     - Split connecting rods to allow fast and easy piston removal without disturbing the big end bearing

     - Segmental camshaft design

     - Simplified parts spectrum by using single-pipe exhaust gas

     - Engine block free from cooling water
  • State-of-art material ensures long life time

Ease Of Maintenance

  • Smart maintenance solutions allow an easy component accessibility
  • Large inspection openings afford an easy serviceability to core engine internals
  • Core engine components designed for reconditioning and reuse
  • Short maintenance times enable high availability
  • No engine removal necessary for maintenance and overhauls


  • Liquid: Light fuel oil (LFO), crude oil and heavy fuel oil (HFO) with fuel quality up to 700 cSt/50°C according to CIMAC H55/K55
  • Dual:

     - Light fuel oil (LFO), crude oil and heavy fuel oil (HFO) with fuel quality up to 700 cSt/50°C according to CIMAC H55/K55

     - Natural gas with methane number > 80 and lower heating value of 28MJ/Nm3
  • Gaseous: Natural gas with methane number > 80 and lower heating value of 31.5 MJ/Nm3


  • World bank emission certification (Stage 2)
  • Technische Anleitung (TA) Luft (only gas)
  • Post-emission treatment systems for lower emission requirements available

Expertise & Experience

  • Assistance for planning
     - delivery
     - commissioning
     - operation and service)
  • Expertise and experience for solutions to maximize benefits, e.g. combine heat and power systems (CHP)

World Wide Product Support

  • With nearly 200 Cat dealers we are at home around the globe
  • Factory-trained technicians, original parts and support are never out of reach
  • Long term service agreements offer back-to-back services from preventive maintenance, scheduled maintenance to full operation and maintenance of your asset

Generator Set Specifications
Minimum Rating 985 kWe
Maximum Rating 1650 kWe
Emissions/Fuel Strategy (WB) Stage 1 and 2
Voltage 3000 to 13800 Volts
Frequency At Speed 50 Hz @ 1000 / 60 Hz @ 900
Duty Cycle Prime, Continuous
Ready To Accept Loads (Preheated/Vented) 40 s
Normal Ramp Up To 100% Load 75 s
Emergency Ramp Up 10% To 100% Load 25 s
Genset Efficiency Up To 43.10%
Engine Specifications
Engine Model CM20C, 4-stroke-engine
Bore 200 mm (7.87 in)
Stroke 300 mm (11.81 in)
Aspiration Turbocharged-aftercooled
Engine Rating Range 1020 - 1710 kW
Configuration 6,8,9 cylinder
Fuel Type Diesel oil / heavy fuel oil (HFO) / crude oil
Swept Volume 9.4 l/cyl (575 inu00b3)
Mean Effective Pressure Up To 24.2 bar (351 psi)
Specific Fuel Oil Consumption (WB I) Up To 189 g/kWh (0.417 Ib/kWh)
Specific Fuel Oil Consumption (WB II) Up To 189 g/kWh (0.417 Ib/kWh)
Specific Lube Oil Consumption 0.6 g/kWh (0.001 Ib/kWh)
Generator Set Dimensions
Length - Minimum 6073 mm (239 in)
Length - Maximum 7125 mm (281 in)
Width - Minimum 1680 mm (66 in)
Width - Maximum 1816 mm (71 in)
Height - Minimum 2833 mm (112 in)
Height - Maximum 3010 mm (119 in)
Dry Weight - Genset (minimum) 18.8 ton (US) (41447 lb)
Dry Weight - Genset (maximum) 30 ton (US) (66139 lb)

Standard Equipment

  • Fuel System
    • Pre-pressure module
    • Circulation module
    • Separator module
    • Gas valve unit (GVU) (only dual fuel (DF) and gas)
    • Engine ventilation module (only dual fuel (DF) and gas)
    • Ignition fuel oil module (only dual fuel (DF))
  • Lubricating Oil System
    • Combined module: cooling water system and lube oil system
    • Piping interface module
    • Lube oil separator module
  • Cooling Water System
    • Piping interface module
    • Cooling water system with radiators
    • Combined module: see lube oil system
  • Starting System
    • Starting air compressor module
    • Starting air receiver module
  • Combustion Air System
    • Air filter – oil bath
    • Air filter – pulse
    • Air filter – pocket
  • Exhaust System
    • Selective catalytic reduction (SCR) system
    • Oxidation catalytic (Oxicat) converter system
    • Exhaust gas ventilation module (only dual fuel (DF) and gas)
    • Exhaust gas silencer
  • Control & Monitoring System
    • Motor control center module (MCC)
    • Local data panel (LDP) / generator control panel (GCP)
    • Local control panel (LCP)
    • Engine monitoring package
    • Gas leak detection per cylinder (only dual fuel (DF) and gas)
  • Mounting System
    • Elastic mounting – genset/engine

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