Service parts for the 450 DFEJ
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 450 kW |
| Standby kVA | 563 |
| Prime power | 410 kW |
| Emissions | EPA NSPS Stationary Emergency Tier 2 |
| Controller | PCC2100, PowerCommand 2.3 |
| Oil capacity | 83.3 L |
| Alternator | Stamford/AvK HC5F (alternator data sheet ADS-306 lists frame size HC5D) (4-pole, Class Class H insulation) |
| Voltage options | 110/190 V, 120/208 V, 230/400 V, 347/600 V, 110/220 V, 127/220 V, 240/416 V, 115/200 V, 139/240 V, 255/440 V, 115/230 V, 220/380 V, 277/480 V |
| Phase | 3 |
| Power factor | 0.8 |
| Circuit breaker | 800 A |
| Max ambient | 40 °C |
| Dimensions (L×W×H) | 3864×1524×1812 mm |
| Dry weight | 4098 kg |
| Wet weight | 4234 kg |
| Sound level | 74.0 dBA @ 7 m |
Engine
| Oil capacity | 83.3 L |
|---|---|
| Coolant capacity | 57.9 L |
| Displacement | 14.9 L |
| Aspiration | Turbocharged with air-to-air charge air-cooling |
| Rated speed | 1800 rpm |
Same engine, other brands
2 brandsThe Cummins/Onan QSX15-G9 in this set also powers 5 generator sets sold under 2 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| Katolight | D500FJZ4, D500FNZ4, D500FPZ4, D500FRZ4 |
| MQ Power | CG500C2 |
Maintenance & consumables
for the Cummins/Onan QSX15-G9| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | L028-2 | 50 hr | eBay | ||
| Fuel filter | New o-ring seal supplied with the new filter. For Biodiesel applications use gasket pack 3950445 S (green) and change with every filter change. | — | |||
| Oil filter | 885 hrs 5/13/25 | — | 500 hr | ||
| Battery | 2 8D batteries | — | 100 hr | ||
| Coolant | -35 | 57.9 | — | 8 hr | |
| Oil | 88.0 L | — | 8 hr |
Service specifications
31| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | Battery charging alternator output | 35 | Amps | |
| Other | Compression ratio | 17.0:1 | ||
| Other | Overspeed limit | 2150 ± 50 | rpm | |
| Pressure | BMEP at set rated load | 2433.9 | kPa | standby rating |
| Pressure | BMEP at set rated load | 2433.9 (353.0) | kPa (psi) | standby rating |
| Pressure | Maximum air cleaner restriction | 6.2 | kPa | |
| Pressure | Maximum air cleaner restriction | 6.2 (25.0) | kPa (in H2O) | |
| Pressure | Maximum back pressure | 10.2 (41.0) | kPa (in H2O) | |
| Pressure | Maximum back pressure (exhaust) | 10.2 | kPa | |
| Pressure | Maximum cooling air flow static restriction | 0.12 (0.5) | kPa (in H2O) | |
| Pressure | Maximum exhaust back pressure | 10.2 (41.0) | kPa (in H2O) | |
| Pressure | Maximum inlet restriction (fuel) | 127.0 | mm Hg | |
| Pressure | Maximum inlet restriction (fuel) | 127.0 (5.0) | mm Hg (in Hg) | |
| Pressure | Maximum return restriction (fuel) | 165.1 | mm Hg | |
| Pressure | Maximum return restriction (fuel) | 165.1 (6.5) | mm Hg (in Hg) | |
| Speed | Frequency regulation | Isochronous | ||
| Speed | Piston speed | 10.1 | m/s | rated speed |
| Speed | Rated speed | 1800 | rpm | |
| Temperature | Cooling system ambient design (optional set-mounted radiator) | 50 | °C | |
| Temperature | Cooling system ambient design (standard set-mounted radiator) | 40 | °C | |
| Temperature | Exhaust temperature | 482.8 (901.0) | °C (°F) | standby rating, set rated load |
| Temperature | Exhaust temperature at set rated load | 466.7 | °C | prime rating |
| Temperature | Exhaust temperature at set rated load | 482.8 | °C | standby rating |
| Temperature | Exhaust temperature at set rated load | 482.8 (901.0) | °C (°F) | standby rating |
| Temperature | Standard temperature rise | 125 | °C | standby at 40 °C ambient |
| Voltage | Equalize voltage | 6.5% above float voltage sensing | ||
| Voltage | Float voltage – 12VDC batteries | 12.87, 13.08, 13.31, 13.50, 13.62, 14.30 | VDC | default 13.50 |
| Voltage | Float voltage – 24VDC batteries | 25.74, 26.16, 26.62, 27.00, 27.24, 28.60 | VDC | default 27.00 |
| Voltage | Input voltage AC (battery charger) | 120, 208, 240 ±10% | VAC | |
| Voltage | Output voltage regulation (battery charger) | ±0.5% | line and load regulation | |
| Voltage | Voltage regulation, no load to full load | ± 0.5 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | Diesel | Fuel type: Diesel |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
6| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 27 | Low AC voltage shutdown | Voltage on any phase has dropped below a preset value; adjustable 50-95% of reference, delay 2-20 seconds; default 85% for 10 seconds | Shutdown | Investigate voltage regulation / load |
| 32 | Reverse power shutdown | Adjustment range 5-20% of standby kW rating, delay 1-15 seconds; default 10%, 3 seconds | Shutdown | Investigate paralleling / load |
| 59 | High AC voltage shutdown | Output voltage on any phase exceeds preset values; time to trip inversely proportional to amount above threshold. Adjustable 105-125% of nominal voltage, time delay adjustable 0.1-10 seconds. Default 110% for 10 seconds. | Shutdown | Investigate voltage regulation / sensing |
| 81 o | Over frequency shutdown/warning | Genset operating at potentially damaging frequency; adjustable 2-10 Hz above nominal, 1-20 s delay, default 6 Hz / 20 s (disabled) | Warning | Shutdown/warning on over frequency |
| 81 u | Under frequency shutdown | Genset output frequency cannot be maintained; adjustable 2-10 Hz below reference, 5-20 s delay, default 6 Hz / 10 s | Shutdown | Investigate governor / load |
| — | Fail to start (overcrank) shutdown | Genset fails to start by completion of the engine crank sequence | Shutdown | Check fuel, batteries, cranking system |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 110/190 | 3 | 12 | Full load current at Standby rating: 1901 A | |
| 110/220 | 3 | 12 | Full load current at Standby rating: 1642 A | |
| 115/230 | 3 | 12 | Full load current at Standby rating: 1571 A | |
| 120/208 | 3 | 12 | Full load current at Standby rating: 1737 A | |
| 139/240 | 3 | 12 | Full load current at Standby rating: 1505 A | |
| 220/380 | 3 | 12 | Full load current at Standby rating: 951 A | |
| 230/400 | 3 | 12 | Full load current at Standby rating: 903 A | |
| 240/416 | 3 | 12 | Full load current at Standby rating: 868 A | |
| 255/440 | 3 | 12 | Full load current at Standby rating: 821 A | |
| 277/480 | 3 | Wye, 4 Wire | 12 | Full load current at Standby rating: 753 A |
| 277/480 | 3 | Wye, 4 wire | 12 | Alternator 60 Hz, 12 lead, limited range, 125 °C; single phase power may be taken at up to 40% of nameplate kW at unity power factor |
| 347/600 | 3 | 12 | Full load current at Standby rating: 602 A |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What size generator is the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ is rated 450 kW standby (563.0 kVA).
Which engine powers the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ is powered by the Cummins/Onan QSX15-G9 engine.
What kind of fuel does the Cummins/Onan 450 DFEJ run on?
The Cummins/Onan 450 DFEJ runs on Diesel.
How much oil does the Cummins/Onan 450 DFEJ take?
The Cummins/Onan QSX15-G9 engine in the Cummins/Onan 450 DFEJ has an oil capacity of 83.3 liters.
What is the coolant capacity of the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ cooling system holds 57.9 liters (15.3 US gallons) for the engine, per the manufacturer specification sheet.
What is the continuous rating of the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ is rated 410 kW prime (513 kVA), against 450 kW standby.
How loud is the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ is rated at 74.0 dBA at 7 m, per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ has a dry weight of 4098 kg (9034 lb).
What voltage does the Cummins/Onan 450 DFEJ produce?
The Cummins/Onan 450 DFEJ is offered in 110/190 V, 120/208 V, 230/400 V, 347/600 V, 110/220 V, 127/220 V, 3-phase.
What alternator comes on the Cummins/Onan 450 DFEJ?
The Cummins/Onan 450 DFEJ uses a Stamford/AvK HC5F (alternator data sheet ADS-306 lists frame size HC5D) alternator. It has 4 poles. Insulation class Class H.
What air filter does the Cummins/Onan 450 DFEJ use?
The Cummins/Onan 450 DFEJ uses air filter part number L028-2.
Troubleshooting
4Fault codes
| Code | Meaning |
|---|---|
| 59 | Output voltage on any phase exceeds preset values. |
| 27 | Voltage on any phase has dropped below a preset value. |
| 81 u | Generator set output frequency cannot be maintained. |
| 81 o | Generator set is operating at a potentially damaging frequency level. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
11| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 0179-3536 | Coolant heater (Revision E) | Service part / kit | eBay | |
| 0402-0222 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | buy | |
| 0402-0234 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | buy | |
| 0402-0246 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | buy | |
| 0402-0427 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | buy | |
| A035H139 | Switch, Pushbutton | 1 | Service part / kit | eBay |
| A040U808 | Harness, Control − Door (Includes Items 30 & 31) | 1 | Service part / kit | eBay |
| A046Y204 | Shield, Wiring | 1 | Service part / kit | eBay |
| CC2609 | Fleetguard Water-Check H2O 3-Way Test Strips | 1 | Service part / kit | Amazon eBay |
| TB3-5 | Generator Set Control Panel Terminal Block | 1 | Service part / kit | Amazon eBay FridayParts $399.75 |
| TB3-6 | Generator Set Control Panel Terminal Block | 1 | Service part / kit | Amazon eBay FridayParts $65.10 |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 25% | 41.0 | 10.9 |
| Prime | 50% | 67.0 | 17.6 |
| Prime | 75% | 90.0 | 23.7 |
| Prime | 100% | 115.0 | 30.4 |
| Standby | 25% | 44.0 | 11.6 |
| Standby | 50% | 71.0 | 18.8 |
| Standby | 75% | 97.0 | 25.7 |
| Standby | 100% | 130.0 | 34.4 |
Available documents
This page was generated from the 6 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.