Cummins/Onan KT2300-G Engine Engine
The Cummins/Onan KT2300-G is a 37.7 L 12-cylinder engine rated at 1800 rpm, producing up to 679 kW. It powers generator sets from Cummins/Onan, including the 500 DFX-57R, 600 DFX-4R and 600 DFX-4XR. It holds 151.4 L (40.0 gal) of oil and 207.9 L (54.9 gal) of coolant.
Also known as: Cummins KT2300-G
Engine specifications
| Oil capacity | 151.4 L |
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| Coolant capacity | 207.9 L |
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| Displacement | 37.7 L |
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| Cylinders | 12 |
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| Rated speed | 1800 rpm |
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| Gross power | 679 kW |
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Generator sets powered by this engine
3Common problems
8- Weakness and Sleepiness
Fix: Get out into fresh air immediately. - Vomiting
Fix: Get out into fresh air immediately. - Muscular Twitching
Fix: Get out into fresh air immediately. - Fault lamp lights and engine stops cranking after approximately 75-seconds.
Fix: See engine service manual for troubleshooting fuel system. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position. - Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, light ON.
Fix: Check fuel supply. - Dizziness
Fix: Get out into fresh air immediately. - "Low oil pressure shutdown."
Fix: Check— a. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system. - "High engine temperature shutdown."
Fix: Check— a. Coolant level. Replenish is necessary. b. City water cooled sets. Check water flow, valves, etc. c. Check sensor; check thermostat.
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KT2300-G.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
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| Air filter | Paper type | | 140-1371 | | PartsGeek |
| Fuel filter | Replaceable element | | — | | find |
| Oil filter | Replaceable element in housing | | — | 500 hr | find |
| Coolant | | 207.9 l | — | 2000 hr | |
| Oil | ASTM D2890 and MIL-L-2104-C | 151.4 l | — | 500 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Common questions
What is the oil capacity of the Cummins/Onan KT2300-G?
The Cummins/Onan KT2300-G engine has an oil capacity of 151.4 liters.
What is the displacement of the Cummins/Onan KT2300-G?
The Cummins/Onan KT2300-G has a displacement of 37.7 liters with 12 cylinders.
Which generators use the Cummins/Onan KT2300-G engine?
The Cummins/Onan KT2300-G powers 3 generator set(s), including Cummins/Onan 500 DFX-57R, Cummins/Onan 600 DFX-4R, Cummins/Onan 600 DFX-4XR.
How often should you change the oil in the Cummins/Onan KT2300-G?
The Cummins/Onan KT2300-G oil change interval is every 500 hours.
What is a common problem with the Cummins/Onan KT2300-G engine?
A commonly reported issue on generators using the Cummins/Onan KT2300-G is: Weakness and Sleepiness. Fix: Get out into fresh air immediately..