Specifications
| Fuel | multi-fuel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 25 kW |
| Standby kVA | 31 |
| Prime power | 25 kW |
| Controller | Engine Control Module |
| Oil capacity | 4.0 L |
| Voltage options | 120/240 V |
| Phase | 1 |
| Battery voltage | 12 V |
| Coolant capacity | 11 L |
Engine
| Oil capacity | 4.0 L |
|---|---|
| Coolant capacity | 11.0 L |
| Aspiration | Turbocharged |
Maintenance & consumables
for the Onan Modified Ford LRG-423 (Turbocharged)| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 90 hr | find | ||
| Fuel filter | — | 90 hr | find | ||
| Oil filter | — | 200 hr | find | ||
| Belt | — | 90 hr | find | ||
| Coolant | — | ||||
| Coolant filter | — | find | |||
| Oil | API viscosity grade for the temperature conditions | — | 200 hr |
Common questions
What is the power rating of the Cummins/Onan 25 GEAF?
The Cummins/Onan 25 GEAF is rated 25 kW standby (31.25 kVA).
What engine does the Cummins/Onan 25 GEAF use?
The Cummins/Onan 25 GEAF is powered by the Onan Modified Ford LRG-423 (Turbocharged) engine.
What fuel does the Cummins/Onan 25 GEAF use?
The Cummins/Onan 25 GEAF runs on multi-fuel.
What is the oil capacity of the Cummins/Onan 25 GEAF?
The Onan Modified Ford LRG-423 (Turbocharged) engine in the Cummins/Onan 25 GEAF has an oil capacity of 4.0 liters.
Troubleshooting
26Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| ENG TEMP | Hl ENG TEMP lamp lights. Engine shuts down. | Engine has overheated (engine temperature has risen above 215°F/102°C) or coolant level is low. | A. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if loose. d. Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above. |
| LO OIL PRES | 4, LO OIL PRES lamp lights. Engine shuts down. | NOTE: See also step 5. a. Check oil level, lines and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Contact an authorized service center if oil pressure is not in the range of 40 to 65 psi (275 to 448 kPa). | |
| OVERCRANK | 5. OVERCRANK lamp lights and engine stops cranking. | A. Check for empty fuel tank (LPG Vapor), fuel or leaks, or plugged fuel lines and correct as required. | |
| LO OIL PRES | Engine runs, shuts down, and LO OIL PRES lamp lights. | B. Check for dirty fuel filter and replace if necessary (see Maintenance section). c. Check for dirty or plugged air filter and replace if necessary (see Maintenance section). d. Reset the control and restart after correcting the problem. Contact an authorized service center for service if none of the above. | |
| OVERSPEED | 6. Engine runs and then shuts down, OVERSPEED lamp lights. | Indicates engine has exceeded normal operating speed. Contact an authorized service center for service. | |
| SWITCH OFF | 7. SWITCH OFF lamp flashes. | Indicates Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. Move the Run/Stop/Remote switch to the Remote position for automatic starting. | |
| LO FUEL | 8. LO FUEL lamp lights. Engine continues to run....Or to a propane fuel supply (if not already connected). | Move the selector switch on the governor mounting LO FUEL lamp lights. Engine shuts down and LO OIL PRES lamp lights. | |
| OVERLOAD | 9. The OVERLOAD lamp lights. Engine shuts down. | The line circuit breaker is located in the ATS or generator set output box. If load exceeds generator current rating, the breaker will trip preventing the generator from being overloaded. Locate the source of overload and correct as necessary. Manually reset breaker to reconnect the load to the generator. | |
| O/U VOLTAGE | 10. The O/U VOLTAGE lamp lights. Engine shuts down. | Contact an authorized service center for service. |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| PRE HET/LOP lamp lights. Engine continues to operate. | Indicates engine has begun to overheat and engine temperature has risen to approximately 205°F (97°C) or coolant level is low. | A. Reduce load if possible by turning off non-critical loads. b. Check cooling air inlets and outlets and remove any obstructions to airflow. |
| HI ENG TEMP lamp lights. Engine shuts down. | Indicates engine has overheated (engine temperature has risen above 215°F/102°C) or coolant level is low. | A. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if loose. d. Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above. |
| LO OIL PRES lamp lights. Engine shuts down. | Indicates engine oil pressure has dropped to 14 psi (97 kPa). | Check oil level, lines and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Contact an authorized service center if oil pressure is not in the range of 40 to 65 psi (275 to 448 kPa). |
| OVERCRANK lamp lights and engine stops cranking. | Indicates possible fuel system problem. | A. Check for empty fuel tank (LPG Vapor), fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace (if installed on fuel line). c. Check for dirty or plugged air filter and replace if necessary (see Maintenance section). d. Reset the control and restart after correcting the problem. Contact an authorized service center for service if none of the above. |
| Engine runs and then shuts down, OVERSPEED lamp lights. | Contact an authorized service center for service. | |
| SWITCH OFF lamp flashes. | Indicates Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. Move the Run/Stop/Remote switch to the Remote position for automatic starting. | |
| LO FUEL pressure lamp lights. | Indicates interruption of natural gas supply. Connect to a propane fuel supply (if not already connected). Move the select | |
| The OVERLOAD lamp lights. Engine shuts down. | Locate the source of overload and correct as necessary. Manually reset breaker to reconnect the load to the generator. | |
| Fault lamp lights but no fault exists. Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits. | The monitor board or a sensor may be at fault. | Contact an authorized service center for service. |
| Engine will not crank. | Indicates possible fault with control or starting system. Check for the following conditions: | |
| No AC output voltage. | Field breaker is tripped. Reset breaker. Contact an authorized service center if voltage buildup causes breaker to trip. | |
| Green RUN lamp does not light following engine startup. | Indicates possible Start/Disconnect relay failure. | Test light with LAMP TEST position on switch. Contact an authorized service center for assistance. |
| The O/U VOLTAGE lamp lights. Engine shuts down. | Contact an authorized service center for service. | |
| Green RUN lamp lights following engine startup. | Indicates all engine systems are normal. No corrective action required. | |
| 11. Fault lamp lights but no fault exists. | The monitor board or a sensor may be at fault. | Contact an authorized service center for service. |
| The engine does not start after three full cranking cycles. | Place the Run-Stop-Remote switch in the STOP position and momentarily depress the Reset switch. Wait two minutes for the starter motor to cool and then repeat the starting procedure. | |
| The engine does not run after a second attempt at starting. | Refer to the Troubleshooting section. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
13| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 141-0973 | Body, Throttle (includes gaskets) | 1 | Gasket | PartsGeek |
| 193-0447 | Filter, Oil – Spec A | 1 | Oil filter | PartsGeek |
| 193-0467 | Sender, Low Coolant Level | 1 | Sensor | PartsGeek |
| 503-0419 | Elbow, Rubber - Moulded | 1 | Hose | PartsGeek |
| 503-1791 | Hose, Oil Return – Turbocharger | 1 | Hose | PartsGeek |
| 511-0112 | Belt, Fan - Spec A | 2 | Belt | PartsGeek |
| FS-1176s | GAS MIXER | Gas mixer | PartsGeek | |
| LS1169s | FILTER GASKET | Oil filter | PartsGeek | |
| 130-4337-02 | Housing, Radiator | 1 | Service part / kit | PartsGeek |
| 148-0999 | Carburetor – Natural Gas | 1 | Service part / kit | PartsGeek |
| 525-0305 | Onan Green Enamel (Non-Metallic) - 13 oz. Pressurized Spray Can | 1 | Service part / kit | PartsGeek |
| 928-0606 | 1 | Service part / kit | PartsGeek | |
| D1400 | DONALDSONS D1400 SOLVENT | Service part / kit | PartsGeek |
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 |
|---|---|---|---|
Available documents
Parts manual — 928-0231 Onan GEAD (spec A) GEAE GEAF (spec A-B) Genset Parts manual (11-1996) (Cummins/Onan)Service manual — 928-0128 Onan 10-30 GEAD GEAE GEAF Operator's Manual (5-1994) (Cummins/Onan)Service manual — 928-0130 Onan 20 GEAE 25 GEAF Operator's Manual (2-1995) (Cummins/Onan)