Specifications
| Fuel | Gasoline |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 2000 kW |
| Standby kVA | 2500 |
| Prime power | 16 kW |
| Oil capacity | 1.16 L |
| Alternator | 2.5EGHAA |
| Voltage options | 120 V, 120/240 V |
| Phase | Single |
| Rated current | 16.7 A |
| Power factor | 1-1 |
| Circuit breaker | 12.5 A |
| Battery group | 12x10 |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 1.16 L |
| Max ambient | 32 °C |
| Dimensions (L×W×H) | 23×597×406 mm |
| Dry weight | 34 kg |
| Fuel tank | 6.0 L |
| Tank runtime | 2.5 hr |
Engine
| Oil capacity | 1.16 L |
|---|---|
| Coolant capacity | 1.1 L |
| Displacement | 2.5 L |
| Aspiration | Natural |
| Rated speed | 3600 rpm |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | — | 100 hr | ||
| Fuel filter | Fuel Filter | — | 100 hr | ||
| Oil filter | Oil Filter | — | 100 hr | ||
| Battery | Battery | — | 500 hr | ||
| Belt | Belt | — | 500 hr | ||
| Oil | Engine Oil | — | 500 hr | ||
| Spark plug | Spark Plug | — | 100 hr |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Common questions
What is the power rating of the Cummins/Onan 25EGHAA?
The Cummins/Onan 25EGHAA is rated 2000 kW standby (2500.0 kVA).
Which engine powers the Cummins/Onan 25EGHAA?
The Cummins/Onan 25EGHAA is powered by the Cummins/Onan 2.5EGHAA engine.
What fuel does the Cummins/Onan 25EGHAA use?
The Cummins/Onan 25EGHAA runs on Gasoline.
What is the oil capacity of the Cummins/Onan 25EGHAA?
The Cummins/Onan 2.5EGHAA engine in the Cummins/Onan 25EGHAA has an oil capacity of 1.16 liters.
What is the coolant capacity of the Cummins/Onan 25EGHAA?
The Cummins/Onan 25EGHAA cooling system holds 1.16 liters (0.3 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the Cummins/Onan 25EGHAA?
The Cummins/Onan 25EGHAA is rated 16 kW prime (2000 kVA), against 2000 kW standby.
How much does the Cummins/Onan 25EGHAA weigh?
The Cummins/Onan 25EGHAA has a dry weight of 34 kg (74 lb).
What size fuel tank does the Cummins/Onan 25EGHAA have?
The Cummins/Onan 25EGHAA has a 6 liter (2 US gallon) fuel tank, giving about 2.5 hours of runtime.
What voltages is the Cummins/Onan 25EGHAA available in?
The Cummins/Onan 25EGHAA is offered in 120 V, 120/240 V, Single-phase.
What size battery does the Cummins/Onan 25EGHAA need?
The Cummins/Onan 25EGHAA uses 1 battery, 12 V each, group 12x10, per the manufacturer specification sheet.
Which alternator is fitted to the Cummins/Onan 25EGHAA?
The Cummins/Onan 25EGHAA uses a 2.5EGHAA alternator.
Troubleshooting
7Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| FAILS TO CRANK (ELECTRIC START MODELS) | Low Battery, Bad battery connection, Oil is too heavy, Load is connected | Check battery electrolyte level and charge. Clean and tighten all battery and cable connections. Replace with lighter oil. Always disconnect load while starting. |
| CRANKS SLOWLY (ELECTRIC START MODELS) | Choke closed, Dirty air filter, Rich fuel mixture | Open choke. Clean or replace air filter. Contact an Onan service center. |
| ENGINE WONT START | Loose or worn spark plug lead, Faulty spark plug, Dirty fuel filter or generator set at too steep of an angle, Governor out of adjustment or lean fuel mix | Check spark plug lead connection. Remove and clean or replace spark plug. Check fuel filter and generator set angle. Contact an Onan service center. |
| EXHAUSTING BLACK SMOKE | Open DC circuit breaker due to an overload | Remove all loads, reset circuit breaker, check for an overload or short circuit. Do not exceed generator set rated load specifications. |
| UNIT RUNS THEN STOPS | Add fuel. Add oil. Reduce oil level. | |
| UNIT RUNS BUT SURGES | Add fuel. Add oil. Reduce oil level. | |
| NO AC OUTPUT VOLTAGE | Open AC circuit breaker due to an overload | Remove all loads, re-set circuit breaker, check tools or appliances being used for defects. Do not exceed generator set rated load specifications. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 111-1802 | Fuel Fill | 1 | Fuel | Amazon eBay |
| M-1830-2 | AC Receptacle | 1 | Service part / kit | Amazon eBay |
| M-1833 | Oil Fill | 1 | Service part / kit | Amazon eBay |
| M-18344 | DC Receptacle | 1 | 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 | 100% | 0.9 | 2.5 |
| Standby | 100% | 0.8 | 2.5 |
Available documents
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.