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 | PartsGeek 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 fuel does the Cummins/Onan 1250DFLC use?
The Cummins/Onan 1250DFLC runs on Diesel.
Troubleshooting
53Fault 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 |
| 146 | Pre-High Cool Temp |
| 151 | High Coolant Temp |
| 197 | Low Coolant Level |
| 234 | Overspeed |
| 235 | Low Coolant Level |
| 359 | Fail to Start |
| 415 | Low Oil Pressure |
| 441 | Low Battery Voltage |
| 442 | High Battery Voltage |
| 1123 | Shutdown After Battle Short |
| 1124 | Delayed Shutdown |
| 1131 | Battle Short Active |
| 1244 | Engine Normal Shutdown |
| 1311 | Customer Inputs #1 |
| 1312 | Customer Inputs #2 |
| 1317 | Customer Inputs #3 |
| 1318 | Customer Inputs #4 |
| 1334 | Crit Scaler OR |
| 1335 | Non-Crit Scaler OR |
| 1416 | Fail to Shutdown |
| 1417 | Power Down Failure |
| 1433 | Emergency Stop |
| 1434 | Remote Emergency Stop |
| 1435 | Low Coolant Temperature |
| 1438 | Fail to Crank |
| 1442 | Weak Battery |
| 1443 | Battery Failed |
| 1444 | KW Overload |
| 1445 | Short Circuit |
| 1446 | High AC Voltage |
| 1447 | Low AC Voltage |
| 1448 | Under Frequency |
| 1449 | Over Frequency |
| 1461 | Loss of Field |
| 1466 | Modem Failure |
| 1468 | Network Error |
| 1469 | Speed/Hz Match |
| 1471 | Over Current |
| 1472 | Over Current |
| 2335 | Excitation Fault |
| 2336 | Memory Error |
| 2341 | High Control Temperature |
| 2342 | Too Long in Idle |
| 2967 | Governor Fault |
| 2968 | AVR Fault |
| 2969 | LON Failure |
| 2972 | Field Overload |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
40model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 121-0111 | Drive, Pump | 1 | Pump | PartsGeek |
| 121-0113 | Gasket, Pump | 1 | Gasket | PartsGeek |
| 121-0117 | Gasket, Hand Hole | 1 | Gasket | PartsGeek |
| 128-0108 | Insulation, Hose - Bulk | Hose | PartsGeek | |
| 130-5588-02 | Tube, Water Heater | 1 | Hose | PartsGeek |
| 130-5589-02 | Tube, Water Heater | 1 | Hose | PartsGeek |
| 130-5590-02 | Tube, Water Heater | 1 | Hose | PartsGeek |
| 130-5591-02 | Tube, Water Heater | 1 | Hose | PartsGeek |
| 140-2096 | Element, Primary (Outer) | 2 | Air filter | PartsGeek |
| 140-2097 | Cleaner, Air (Includes Elements) | 2 | Air filter | PartsGeek FridayParts $856.89 |
| 140-2467 | Element, Safety (Inner) | 2 | Air filter | PartsGeek |
| 140-2501 | Cleaner, Air (Disposable) | 2 | Air filter | PartsGeek FridayParts $152.02 |
| 140-3163 | Cleaner, Air (No Replaceable Element) | 2 | Air filter | Amazon eBay $23.99 PartsGeek |
| 140-3230 | Cleaner, Air (Includes Elements - See Ref. No. 25 and 26) | 2 | Air filter | Amazon eBay $95.60 PartsGeek |
| 159-1445 | Reservoir, Fuel | 1 | Fluid | PartsGeek |
| 159-1451 | Pump, Fuel Transfer | 1 | Pump | PartsGeek |
| 309-0649 | Thermostat (Opens At 110 F, Closes At 130 F) | 1 | Thermostat | PartsGeek |
| 501-0704 | Line, Flexible Fuel - Fuel Out | 1 | Hose | PartsGeek |
| 501-0707 | Line, Flexible Fuel - Fuel In | 1 | Hose | PartsGeek |
| 509-0283-01 | Seal, Rectangular Ring | 2 | Seal | PartsGeek |
| 509-0336 | Seal, O-Ring | 1 | Seal | PartsGeek |
| 509-0337 | Seal, O-Ring | 1 | Seal | PartsGeek |
| 121-0116 | Cover, Hydraulic Hole | 1 | Service part / kit | PartsGeek |
| 140-1260 | Fitting, Safety Filter | 2 | Service part / kit | Amazon eBay $35.00 PartsGeek |
| 140-1548 | Indicator, Service | 2 | Service part / kit | Amazon eBay $91.60 PartsGeek |
| 140-2098 | Hood, Air Inlet (Includes Mounting Clamp) | 2 | Service part / kit | Amazon eBay $49.99 PartsGeek |
| 140-2099 | Band, Mounting | 4 | Service part / kit | Amazon eBay $19.99 PartsGeek |
| 140-2395 | Tube, Air Inlet | 1 | Service part / kit | PartsGeek |
| 140-2502 | Band, Mounting - Air Cleaner | 4 | Service part / kit | Amazon eBay $59.99 PartsGeek |
| 140-2503 | Bracket, Mounting - Air Cleaner | 1 | Service part / kit | PartsGeek |
| 140-2504-01 | Bracket, Mounting (Right Side) | 1 | Service part / kit | PartsGeek |
| 140-2504-02 | Bracket, Mounting (Left Side) | 1 | Service part / kit | PartsGeek |
| 140-2508 | Tube, Air Inlet | 2 | Service part / kit | Amazon eBay $129.95 PartsGeek |
| 140-2509 | Tube, Air Inlet | 2 | Service part / kit | PartsGeek |
| 140-2515 | Bracket, Mounting | 1 | Service part / kit | PartsGeek |
| 140-2519 | Tube, Air Inlet | 2 | Service part / kit | PartsGeek |
| 140-2521 | Tube, Air Inlet | 2 | Service part / kit | PartsGeek |
| 140-2528 | Shield - Air In Heat | 1 | Service part / kit | PartsGeek |
| 333-0677-01 | Heater, Coolant - 4990 Watt | 2 | Service part / kit | PartsGeek |
| 333-0677-02 | Heater, Coolant - 6420 Watt | 2 | Service part / kit | PartsGeek firsttruck $2220.00 |
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
Parts manual — Cummins-DFLB-DFLC-DFLE-generator-set-parts-manual (Cummins/Onan)