Specifications
| Fuel | gasoline |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 4000 kW |
| Prime power | 3500 kW |
| Oil capacity | 2.0 L |
| Alternator | 1400 |
| Voltage options | 120 V, 240 V |
| Phase | single-phase |
| Rated current | 105 A |
| Battery group | SAE group IH |
| Battery voltage | 12 V |
| Battery quantity | 2 |
| Dimensions (L×W×H) | 717×457×533 mm |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Cleaner Element | 140-0495 | eBay $16.99 | ||
| Fuel filter | N/A | — | find | ||
| Oil filter | Oil Filter | 122-0323 | eBay $41.99 FridayParts $39.99 | ||
| Battery | SAE group IH | — | |||
| Belt | N/A | — | find | ||
| Coolant | N/A | — | |||
| Oil | SAE | 3.79 qt | — | 100 hr | |
| Spark plug | N/A | — | 50 hr | find |
Common questions
What size generator is the Cummins/Onan 1400?
The Cummins/Onan 1400 is rated 4000 kW standby.
Is the Cummins/Onan 1400 diesel or gas?
The Cummins/Onan 1400 runs on gasoline.
What alternator comes on the Cummins/Onan 1400?
The Cummins/Onan 1400 uses a 1400 alternator.
Which oil filter part number does the Cummins/Onan 1400 take?
The Cummins/Onan 1400 uses oil filter part number 122-0323.
What air filter fits the Cummins/Onan 1400?
The Cummins/Onan 1400 uses air filter part number 140-0495.
Troubleshooting
7Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Generator Runs but does not Produce Current. | Brushes not contacting commutator. | Free brushes in holders. Assemble brushes and springs correctly. |
| Generator Produces Low Voltage | Speed low because of loose, slipping belts. | Adjust belt tension. |
| Low or Discharged Battery | Faulty Starter, Faulty Start Solenoid | |
| Engine Flooded | Rich Fuel Mixture or Choke Stuck, Out of Fuel - Check, Lean Fuel Mixture - Readjust, Poor Quality Fuel, Dirty Carburetor, Dirty Air Cleaner, Dirty Fuel Filter, Defective Fuel Pump | |
| Wrong Valve Clearance | Broken Valve Spring, Valve or Valve Seal Leaking, Piston Rings Worn or Broken, Wrong Bearing Clearance | |
| Cooling System Overheating | Poor Air Circulation, Dirty or Oily Cooling Fins | |
| Fuel Cut Off | TOP PUMP SOLENOID VALVE |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
11- Adjust as follows:
- Tighten field poles to frame.
- I
- D » I V t C N D .
- N«
- N «
- Adjust as follows:
- SERVICE AND MAINTENANCE
- N«
- N «
- 214A48
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
35| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 122-0323 | Oil Filter | 1 | Oil filter | eBay $41.99 FridayParts $39.99 |
| 140-0495 | Air Cleaner Element | 1 | Air filter | eBay $16.99 |
| 149-1304 | Fuel Pump Electric (Onan) | 1 | Fuel pump | buy |
| 154-0733 | Gasket, Intake Manifold | 1 | Gasket | buy |
| 154-1482 | Exhaust Manifold Gasket | 14 | Gasket | buy |
| 167-0247 | Spark Plug | 2 | Spark plug | buy |
| 168-0137 | Carbon Removal Gasket Kit | Gasket | buy | |
| B356 | Onan Electric Fuel Pump | 1 | Electric fuel pump | buy |
| 142-0202 | Carburetor | Service part / kit | buy | |
| 160-1211 | Breaker Points | Service part / kit | buy | |
| 166-0643 | Coil, Ignition | 1 | Service part / kit | buy |
| 203A62 | Spring, Brush | 1 | Service part / kit | buy |
| 205C60 | Blower, A i r | 1 | Service part / kit | buy |
| 20IA959 | Armature Wound, Assembly | 1 | Service part / kit | buy |
| 214A48 | Brush, Collector Ring (AC) | 4 | Service part / kit | buy |
| 21ID97 | Bell, End - Brush Rig End | 1 | Service part / kit | buy |
| 222A1286 | Coil Set, Field | 1 | Service part / kit | buy |
| 222AI260 | Coil Set, Commutating | 1 | Service part / kit | buy |
| 22IA47 | Interpole, Commutating | 1 | Service part / kit | buy |
| 232A596 | Clip, Bearing | 1 | Service part / kit | buy |
| 234A77 | Blower, Air. | 1 | Service part / kit | buy |
| 234C47 | Bell, End - Brush Rig End. 234C47 For models with Parts Key No. 1. | 1 | Service part / kit | buy |
| 234C65 | Band, End Bell | 1 | Service part / kit | buy |
| 307-0845 | Start Solenoid | 1 | Service part / kit | eBay $126.18 FridayParts $27.40 |
| 307-1457 | Fuel Solenoid | Service part / kit | buy | |
| 312-0069 | Condenser (Breaker Box) | 1 | Service part / kit | eBay $24.99 |
| 312A17 | Brush, Commutator | 1 | Service part / kit | buy |
| 35C01-01800 | PIN,PIPEL/0 | 12 | Service part / kit | buy |
| 403A95 | Bolt, Eye - L i f t i n g | 1 | Service part / kit | buy |
| 518-12 | Ring, Retaining - External - Drive End Bearing to Shaft. | 1 | Service part / kit | buy |
| 518-166 | Ring, Retaining - Internal - Drive End Bearing to End Bell. | 2 | Service part / kit | buy |
| 520A337 | Stud, GENERATOR THROUGH | 1 | Service part / kit | buy |
| 5I0A52 | Bearing, Armature - Drive End | 1 | Service part / kit | buy |
| 5I5A45 | Key, Armature Shaft Drive | 1 | Service part / kit | buy |
| A25X60 | Chase-Shawmut 'Amp-trap' fuse (Type 4) | Service part / kit | buy |
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% | 4.92 | |
| Standby | 100% | 1.3 |
Available documents
Owner's manual — 930-0302 Onan LKB Operator's and Parts Manual (1-1971) (Cummins/Onan)Service manual — 943-0004 Onan UF Battery Charger Manual(3-1077) (Cummins/Onan)