Service parts for the 1250DFLC
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 | 1250 kW |
| Controller | 3100, PowerCommand 2100 |
| Phase | 1 or 3 |
| Battery voltage | 24 V |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 140-2097 | Amazon eBay FridayParts $856.89 |
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 1250DFLC?
The Cummins/Onan 1250DFLC is rated 1250 kW standby.
What engine does the Cummins/Onan 1250DFLC use?
The Cummins/Onan 1250DFLC is powered by the Cummins/Onan KTA50-G11 engine.
What kind of fuel does the Cummins/Onan 1250DFLC run on?
The Cummins/Onan 1250DFLC runs on Diesel.
Which air filter part number does the Cummins/Onan 1250DFLC take?
The Cummins/Onan 1250DFLC uses air filter part number 140-2097.
Troubleshooting
6Fault codes
| Code | Meaning |
|---|---|
| 121 | Speed Signal Lost |
| 135 | Oil Pressure Sensor High |
| 141 | Oil Pressure Sensor Low |
| 143 | Pre-Low Oil Pressure Sensor |
| 144 | Coolant Temperature Sensor High |
| 145 | Coolant Temperature Sensor Low |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan 1250DFLC troubleshooting guide (53 entries) →
Parts
40model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 121-0111 | Drive, Pump | 1 | Pump | Amazon eBay |
| 121-0113 | Gasket, Pump | 1 | Gasket | Amazon eBay |
| 121-0117 | Gasket, Hand Hole | 1 | Gasket | Amazon eBay |
| 128-0108 | Insulation, Hose - Bulk (7/8º ID) (Order By The Foot - 10 Feet Required) | - | Hose | Amazon eBay |
| 130-5588-02 | Tube, Water Heater | 1 | Hose | Amazon eBay |
| 130-5589-02 | Tube, Water Heater | 1 | Hose | Amazon eBay |
| 130-5590-02 | Tube, Water Heater | 1 | Hose | Amazon eBay |
| 130-5591-02 | Tube, Water Heater | 1 | Hose | Amazon eBay |
| 140-2096 | Element, Primary (Outer) | 2 | Air filter | Amazon eBay |
| 140-2097 | Cleaner, Air (Includes Elements) | 1 | Air filter | Amazon eBay FridayParts $856.89 |
| 140-2467 | Element, Safety (Inner) | 2 | Air filter | Amazon eBay |
| 140-2501 | Cleaner, Air (Disposable) | 2 | Air filter | Amazon eBay $292.25 FridayParts $152.02 |
| 140-2502 | Band, Mounting | 4 | Air filter | Amazon eBay $69.95 |
| 140-2503 | Bracket, Mounting | 1 | Air filter | Amazon eBay |
| 140-3163 | Cleaner, Air (No Replaceable Element) | 2 | Air filter | Amazon eBay $162.28 FridayParts $152.02 |
| 140-3230 | Cleaner, Air (Includes Elements - See Ref. No. 25 and 26) | 2 | Air filter | Amazon eBay FridayParts $856.89 |
| 159-1445 | Reservoir, Fuel | 1 | Fluid | Amazon eBay |
| 159-1451 | Pump, Fuel Transfer | 1 | Pump | Amazon eBay |
| 309-0649 | Thermostat | 1 | Thermostat | Amazon eBay $144.99 |
| 501-0704 | Line, Flexible Fuel - Fuel Out | 1 | Hose | Amazon eBay |
| 501-0707 | Line, Flexible Fuel - Fuel In | 1 | Hose | Amazon eBay |
| 509-0283-01 | Seal | 1 | Seal | Amazon eBay |
| 509-0336 | Seal, O-Ring | 1 | Seal | Amazon eBay |
| 509-0337 | Seal, O-Ring | 1 | Seal | Amazon eBay |
| 121-0116 | Cover, Hydraulic Hole | 1 | Service part / kit | Amazon eBay |
| 140-1260 | Fitting, Safety Filter | 2 | Service part / kit | Amazon eBay $116.27 |
| 140-1548 | Indicator, Service | 2 | Service part / kit | Amazon $29.99 eBay $49.99 |
| 140-2098 | Hood, Air Inlet (Includes Mounting Clamp) | 1 | Service part / kit | Amazon eBay |
| 140-2099 | Band | 2 | Service part / kit | Amazon eBay |
| 140-2395 | Tube, Air Inlet | 1 | Service part / kit | Amazon eBay |
| 140-2504-01 | Bracket - Right Side | 1 | Service part / kit | Amazon eBay |
| 140-2504-02 | Bracket - Left Side | 1 | Service part / kit | Amazon eBay |
| 140-2508 | Tube, Air Inlet | 2 | Service part / kit | Amazon eBay |
| 140-2509 | Tube, Air Inlet | 2 | Service part / kit | Amazon eBay |
| 140-2515 | Bracket, Mounting | 1 | Service part / kit | Amazon eBay |
| 140-2519 | Tube, Air Inlet | 2 | Service part / kit | Amazon eBay |
| 140-2521 | Tube, Air Inlet | 2 | Service part / kit | Amazon eBay |
| 140-2528 | Shield | 1 | Service part / kit | Amazon eBay |
| 333-0677-01 | Heater, Coolant - 4990 Watt | 2 | Service part / kit | Amazon eBay $1879.00 |
| 333-0677-02 | Heater, Coolant - 6420 Watt | 2 | Service part / kit | Amazon eBay $1948.00 |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.