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 for the Cummins/Onan KTA50-G11
4Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P551670 | Lube Filter, Spin-On Full Flow | CUMMINS 298670, CUMMINS 299670, NAPA 1970, CARBOCOL 0026 | FridayParts $26.68 |
| Oil filter | P550777 | Lube Filter, Spin-On Bypass | CUMMINS 3021658, CUMMINS 33004232, NAPA 1749, BALDWIN B7577 | FridayParts $43.56 |
| Fuel filter | P550105 | Fuel Filter, Spin-On Primary | CUMMINS 154700, CUMMINS 154710, NAPA 3109, NAPA 3405 | buy |
| Fuel / water separator | P552216 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3309437, CUMMINS 3313304, NAPA 3613, BALDWIN BF1216 | buy |
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 (Order By The Foot – 12 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 |
| 140-2098 | Air Cleaner - Throwaway Type | 1 | Air filter | Amazon eBay |
| 140-2467 | Element, Safety (Inner) | 2 | Air filter | Amazon eBay |
| 140-2501 | Cleaner, Air (Disposable) | 2 | Air filter | Amazon eBay $292.25 NAPA $292.42 FridayParts $152.02 |
| 140-2502 | Band, Mounting – Air Cleaner | 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 NAPA $292.42 FridayParts $152.02 |
| 140-3230 | Cleaner, Air (Includes Elements - See Ref. No. 25 and 26) | 4 | 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 (Includes Connector Socket) (S11) | 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 NAPA $10.13 |
| 140-1548 | Indicator, Service | 1 | Service part / kit | Amazon eBay $49.99 NAPA $32.16 |
| 140-2097 | Cleaner, Air (Includes Elements) | 1 | Service part / kit | Amazon eBay FridayParts $856.89 |
| 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 (7" x 9" - 3/4") | 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 – Air In Heat | 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.
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.