Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 200 kW |
| Standby kVA | 250 |
| Oil capacity | 31.0 L |
| Alternator | 3 Phase 60 Hz YB |
| Phase | 3 |
| Power factor | 0.8 |
| Battery group | 8D |
| Battery voltage | 12 V |
| Battery quantity | 2 |
| Coolant capacity | 53 L |
| Dry weight | 2692 kg |
Engine
| Oil capacity | 31.0 L |
|---|---|
| Coolant capacity | 53.0 L |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan NT-855-G2| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Check and replace if necessary at specified intervals | — | 250 hr | ||
| Fuel filter | Drain and change per maintenance schedule | — | 1000 hr | ||
| Oil filter | Per maintenance table at specified intervals | — | 250 hr | ||
| Battery | — | 1000 hr | |||
| Belt | Check tension and condition; replace if damaged | — | 50 hr | ||
| Coolant | Check level at shutdown intervals | 53.0 litres | — | 50 hr | |
| Coolant filter | Clean or replace as required. See Figure 7 for filter location and replacement procedure. | — | |||
| Oil | SAE 10W-30 (-13°C to 35°C), SAE 15W-40 (above -10°C), SAE 20W-40 (above 0°C) | 31.0 litres | — | 50 hr | |
| Spark plug | — |
Common questions
What size generator is the Cummins/Onan DFP 250?
The Cummins/Onan DFP 250 is rated 200 kW standby (250.0 kVA).
What engine does the Cummins/Onan DFP 250 use?
The Cummins/Onan DFP 250 is powered by the Cummins/Onan NT-855-G2 engine.
What kind of fuel does the Cummins/Onan DFP 250 run on?
The Cummins/Onan DFP 250 runs on Diesel.
What's the oil capacity on a Cummins/Onan DFP 250?
The Cummins/Onan NT-855-G2 engine in the Cummins/Onan DFP 250 has an oil capacity of 31.0 liters.
Which alternator is fitted to the Cummins/Onan DFP 250?
The Cummins/Onan DFP 250 uses a 3 Phase 60 Hz YB alternator.
Troubleshooting
6Fault codes
| Code | Meaning | Remedy |
|---|---|---|
| PRE HI ENGINE TEMP | *2. PRE HI ENGINE TEMP lamp lights. Engine continues to operate. | 2. Indicates engine has begun to overheat and engine temperature has risen to approximately 205°F (97°C). If generator is powering non-critical and critical loads and cannot be shutdown, use the following: a. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. c. Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 3. |
| HI ENG TEMP | *3. HI ENG TEMP lamp lights. Engine shuts down. | 3. Indicates engine has overheated (engine temperature has risen above 215°F/102°C) or coolant level is low (sets with coolant level sensor). Allow engine to cool down completely before proceeding with the following checks: 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 Onan Dealer or Distributor if none of the above. |
| PRE LO OIL PRES | *4. PRE LO OIL PRES lamp lights. Engine continues to operate. | 4. Indicates engine oil pressure has dropped to 20 psi (138 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedures in step 5. |
| LO OIL PRES | *5. LO OIL PRES lamp lights. Engine shuts down NOTE: See also step 6. | 5. Indicates engine oil pressure has dropped to 14 psi (97 kPa). Check oil level, lines and filters. If oil system is okay but oil level is low, replenish. Reset control and restart. Contact an Onan Dealer or Distributor if oil pressure is not in the range of 50 to 70 psi (345 to 483 kPa). |
| OVERCRANK | *6. OVERCRANK lamp lights and engine stops cranking. |
Symptoms & remedies
| Symptom | Remedy |
|---|---|
| *1. Green RUN lamp lights following engine start-up. | 1. Indicates all engine systems are normal. No corrective action required. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DFP 250 troubleshooting guide (24 entries) →
Parts
5| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 8342-1 | AIR FILTER | Air filter | Amazon eBay FridayParts $44.80 | |
| 903-0124 | NA | NA | Service part / kit | Amazon eBay |
| 903-0204 | NA | NA | Service part / kit | Amazon eBay |
| 903-0500 | NA | NA | Service part / kit | Amazon eBay |
| 903-0604 | NA | NA | Service part / kit | Amazon eBay |
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.