Service parts for the Quiet Diesel 12500
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
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 |
| Voltage options | 120 V |
| Phase | Single |
| Rated current | 58.3 A |
| Dry weight | 290 kg |
| Sound level | 64.0 dBA |
Maintenance & consumables
for the Cummins/Onan Quiet Diesel| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | 981-0139 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 981-0627 | Amazon eBay | ||
| Oil filter | Oil Filter | 981-0246B | Amazon eBay | ||
| Battery | Clean & Check Battery & Connections | — | 50 hr | ||
| Spark plug | Replace Spark Plugs | — | 250 hr |
Common questions
What engine does the Cummins/Onan Quiet Diesel 12500 use?
The Cummins/Onan Quiet Diesel 12500 is powered by the Cummins/Onan Quiet Diesel engine.
What kind of fuel does the Cummins/Onan Quiet Diesel 12500 run on?
The Cummins/Onan Quiet Diesel 12500 runs on Diesel.
What is the sound level of the Cummins/Onan Quiet Diesel 12500?
The Cummins/Onan Quiet Diesel 12500 is rated at 64.0 dBA, per the manufacturer specification sheet.
How much does the Cummins/Onan Quiet Diesel 12500 weigh?
The Cummins/Onan Quiet Diesel 12500 has a dry weight of 290 kg (639 lb).
What voltages is the Cummins/Onan Quiet Diesel 12500 available in?
The Cummins/Onan Quiet Diesel 12500 is offered in 120 V, Single-phase.
Which oil filter part number does the Cummins/Onan Quiet Diesel 12500 take?
The Cummins/Onan Quiet Diesel 12500 uses oil filter part number 981-0246B.
What fuel filter fits the Cummins/Onan Quiet Diesel 12500?
The Cummins/Onan Quiet Diesel 12500 uses fuel filter part number 981-0627.
What air filter does the Cummins/Onan Quiet Diesel 12500 use?
The Cummins/Onan Quiet Diesel 12500 uses air filter part number 981-0139.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Unit starts and runs, then stops when the start switch is released | Low fluid levels | Check & bring all fluids up to the appropriate levels |
| Unit starts and runs, then stops when the start switch is released | Possible overheating | Check for blocked air flow or other possible causes of overheating |
| Unit starts and runs, then stops when the start switch is released | Other functional problem | Contact an Onan Authorized RV Service & Parts Dealer |
| Unit starts and runs, then stops when the start switch is released | No AC output | Contact an Onan Authorized RV Service & Parts Dealer |
| Unit runs then surges | Loose or worn spark plug leads | Check spark plug leads at spark plug & ignition coil |
| Unit runs then surges | Defective ignition coil, wiring, or control components | Contact an Onan Authorized RV Service & Parts Dealer |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan Quiet Diesel 12500 troubleshooting guide (12 entries) →
Parts
19| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 981-0139 | Air Filter | 2 | Air filter | Amazon eBay |
| 981-0158C | Battery | 1 | Battery | Amazon eBay |
| 981-0164B | Battery | 1 | Battery | Amazon eBay |
| 981-0169 | Battery | 2 | Battery | Amazon eBay |
| 981-0238F | Air Filter | 4 | Air filter | Amazon eBay |
| 981-0246B | Oil Filter | 3 | Oil filter | Amazon eBay |
| 981-0503 | Spark Plug | 2 | Spark plug | Amazon eBay |
| 981-0518D | Oil Filter | 4 | Oil filter | Amazon eBay |
| 981-0607 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 981-0621 | Battery | 1 | Battery | Amazon eBay |
| 981-0623 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 981-0627 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 981-0631B | Battery | 1 | Battery | Amazon eBay |
| 981-0633B | Battery | 1 | Battery | Amazon eBay |
| 981-0640 | Fuel Filter | 2 | Fuel filter | Amazon eBay |
| 983-0101B | Battery | 3 | Battery | Amazon eBay |
| 983-0201C | Battery | 3 | Battery | Amazon eBay |
| 983-0501C | Battery | 3 | Battery | Amazon eBay |
| 983-0600 | Battery | 1 | Battery | 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.
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.