Specifications
| Fuel | NG/LP |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 40 kW |
| Standby kVA | 40 |
| Controller | PowerCommand 1.1 |
| Alternator | CA Series (Class H insulation) |
| Voltage options | 120/240 V, 120/208 V |
| Phase | 1 |
| Rated current | 166.7 A |
| Circuit breaker | 225 A |
| Dimensions (L×W×H) | 2388×864×1157 mm |
| Dry weight | 567 kg |
| Sound level | 71.0 dBA @ 7 m |
Engine
| Coolant capacity | 12.8 L |
|---|---|
| Displacement | 2.4 L |
| Aspiration | Naturally aspirated or turbocharged (varies by generator set model) |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan QSJ2.4| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | Every 500 hours of operation or as needed, whichever comes first | — | 500 hr | ||
| Oil filter | Every 1000 hours of operation or as needed, whichever comes first | — | 1000 hr | ||
| Battery | As needed | — | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | 500 miles or 6 months, whichever comes first | — | 804 hr | ||
| Spark plug | — |
Common questions
How many kW is the Cummins/Onan RX 40?
The Cummins/Onan RX 40 is rated 40 kW standby (40.0 kVA).
What engine does the Cummins/Onan RX 40 use?
The Cummins/Onan RX 40 is powered by the Cummins/Onan QSJ2.4 engine.
What fuel type does the Cummins/Onan RX 40 take?
The Cummins/Onan RX 40 runs on NG/LP.
Which alternator is fitted to the Cummins/Onan RX 40?
The Cummins/Onan RX 40 uses a CA Series alternator. Insulation class H.
Parts
13| Part # | Description | Qty | System | |
|---|---|---|---|---|
| A046N983 | Preventive Maintenance Kit –Heavy Duty | 2 | Air filter | Amazon eBay |
| A046N985 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| A046N987 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| CA115-T12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| CA135-E12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| A046J612 | Base Barrier – Elevated Genset | 1 | Service part / kit | Amazon eBay |
| A046L270 | Instruction Sheet | 1 | Service part / kit | Amazon eBay |
| CA115-H14 | Small | Service part / kit | Amazon eBay | |
| CA115-J12 | Small | Service part / kit | Amazon eBay | |
| CA115-L14 | Small | Service part / kit | Amazon eBay | |
| CA115-M12 | Large | Service part / kit | Amazon eBay | |
| CA115-P12 | Large | Service part / kit | Amazon eBay | |
| CA115-R12 | Large | Service part / kit | Amazon eBay |
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% | 11.73 | 3.1 |
| Standby | 25% | 29.15 | 7.7 |
Available documents
Spec sheet — NAS-5791-EN (Cummins/Onan)Reference (Cummins/Onan)