Service parts for the 500 DFEK
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 | 500 kW |
| Standby kVA | 625 |
| Prime power | 455 kW |
| Emissions | EPA NSPS Stationary Emergency Tier 2 |
| Controller | PowerCommand 2.3 |
| Oil capacity | 83.3 L (88.0 US qt) |
| Alternator | Stamford/AvK HC5F |
| 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 |
| Rated current | 753 A |
| Power factor | 0.8 |
| Circuit breaker | 800 A |
| Battery cranking | 1400 CCA |
| Battery voltage | 24 V |
| Coolant capacity | 57.9 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 3864×1524×1812 mm |
| Dry weight | 4325 kg |
| Wet weight | 4461 kg |
| Sound level | 73.0 dBA @ 7 m |
| Tank runtime | 25 hr |
Engine
| Oil capacity | 83.3 L (88.0 US qt) |
|---|---|
| Coolant capacity | 57.9 L |
| Displacement | 15.0 L |
| Aspiration | Turbocharged with air-to-air charge air-cooling |
| Rated speed | 1800 rpm |
Filters for the Cummins/Onan QSX15-G9
6Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P559000 | Lube Filter, Spin-On Full Flow | CUMMINS 2101869, CUMMINS 2882674, NAPA 400107, BALDWIN BD7154 | KuduParts $17.00 FridayParts $36.00 |
| Oil filter | P550949 | Lube Filter, Spin-On Full Flow | CUMMINS 2882673, CUMMINS 4331005, NAPA 400107, BALDWIN B7322 | KuduParts $67.00 FridayParts $69.59 |
| Fuel filter | P763995 | Fuel Filter, Spin-On | IRISBUS 0504112123, ASTRA 132347, DAF TRP 1533849, NEW HOLLAND 1931108 | buy |
| Fuel / water separator | P551048 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3104081, BALDWIN BF9920, HYUNDAI 11ND70010, WIRTGEN 2111170 | buy |
| Fuel / water separator | P551047 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3101871, CUMMINS 3101872, NAPA 3423, BALDWIN BF1277-SPS | KuduParts $51.00 |
Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Coolant filter | P552073 | Coolant Filter, Spin-On Sca Plus | CUMMINS 209605, CUMMINS 299082, NAPA 4073, IMPERIAL 04WF2073 | buy |
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 | 83.3 L (88.0 US qt) | — | 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 | Genset shut down on low AC output voltage |
| 32 | Reverse power shutdown | Adjustment range 5-20% of standby kW rating, delay 1-15 seconds; default 10%, 3 seconds | Shutdown | Genset shut down on reverse power |
| 59 | High AC voltage shutdown | Output voltage on any phase exceeds preset values; adjustable 105-125% of nominal, time delay 0.1-10 seconds; default 110% for 10 seconds | Shutdown | Genset shut down on high AC output voltage |
| 81 o | Over frequency shutdown/warning | Generator set is operating at a potentially damaging frequency level; 2-10 Hz above nominal, 1-20 second delay; default 6 Hz, 20 seconds, disabled | Shutdown | Shutdown/warning on over frequency |
| 81 u | Under frequency shutdown | Generator set output frequency cannot be maintained; 2-10 Hz below reference, 5-20 second delay; default 6 Hz, 10 seconds | Shutdown | Genset shut down on under frequency |
| — | 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 is the power rating of the Cummins/Onan 500 DFEK?
The Cummins/Onan 500 DFEK is rated 500 kW standby (625.0 kVA).
What engine does the Cummins/Onan 500 DFEK use?
The Cummins/Onan 500 DFEK is powered by the Cummins/Onan QSX15-G9 engine.
What kind of fuel does the Cummins/Onan 500 DFEK run on?
The Cummins/Onan 500 DFEK runs on Diesel.
What is the oil capacity of the Cummins/Onan 500 DFEK?
The Cummins/Onan 500 DFEK takes 83.3 L (88.0 US qt) of engine oil, per CSDG-500-kW-DFEK-2019-Submittal.
What is the fuel flow rate of the Cummins/Onan 500 DFEK (QSX15-G9)?
The Cummins/Onan 500 DFEK has a maximum fuel supply flow of 423.9 L/hr (112 US gph); at full standby load it burns 130 L/h (34.4 gal/h). Source: CSDG-500-kW-DFEK-2019-Submittal.
How much coolant does the Cummins/Onan 500 DFEK hold?
The Cummins/Onan 500 DFEK cooling system holds 57.9 liters (15.3 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the prime power rating of the Cummins/Onan 500 DFEK?
The Cummins/Onan 500 DFEK is rated 455 kW prime (569 kVA), against 500 kW standby.
What is the sound level of the Cummins/Onan 500 DFEK?
The Cummins/Onan 500 DFEK is rated at 73.0 dBA at 7 m, per the manufacturer specification sheet.
How much does the Cummins/Onan 500 DFEK weigh?
The Cummins/Onan 500 DFEK has a dry weight of 4325 kg (9534 lb).
What voltages is the Cummins/Onan 500 DFEK available in?
The Cummins/Onan 500 DFEK is offered in 110/190 V, 120/208 V, 230/400 V, 347/600 V, 110/220 V, 127/220 V, 3-phase.
What battery does the Cummins/Onan 500 DFEK use?
The Cummins/Onan 500 DFEK uses 24 V each, 1400 CCA, per the manufacturer specification sheet.
Which alternator is fitted to the Cummins/Onan 500 DFEK?
The Cummins/Onan 500 DFEK uses a Stamford/AvK HC5F alternator.
Which air filter part number does the Cummins/Onan 500 DFEK take?
The Cummins/Onan 500 DFEK 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 | eBay | |
| 0402-0234 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | eBay | |
| 0402-0246 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | eBay | |
| 0402-0427 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit | eBay $86.02 | |
| 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 flow & consumption
Maximum fuel flow (supply): 423.9 L/hr (112 US gph); fuel consumption at full standby load 130 L/h (34.4 gal/h). Fuel hose and pipe are sized for the maximum fuel flow, not the 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 |
Source — fuel flow: CSDG-500-kW-DFEK-2019-Submittal; consumption: CSDG-500-kW-DFEK-2019-Submittal.
Installation data
Figures an installer sizes exhaust piping and room ventilation from, as printed on the Cummins/Onan 500 DFEK data sheet (standby rating where the sheet gives several).
| Maximum exhaust back pressure | 10.2 kPa (41.0 in H₂O) |
Source — CSDG-500-kW-DFEK-2019-Submittal.
Available documents
This page was generated from the 5 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.