Service parts for the 5000
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 | Gasoline |
|---|---|
| Prime power | 41.7 kW |
| Oil capacity | 3.5 L |
| Voltage options | 120 V |
| Phase | AC |
| Rated current | 41.7 A |
| Circuit breaker | 10 A |
| Battery group | 360 |
| Battery cranking | 450 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Max ambient | 40 °C |
| Dimensions (L×W×H) | 566×854×394 mm |
| Dry weight | 116 kg |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Breaker Ampere Rating 2000A | N20SB | Amazon eBay |
Common questions
Is the Cummins/Onan 5000 diesel or gas?
The Cummins/Onan 5000 runs on Gasoline.
How much oil does the Cummins/Onan 5000 take?
The Cummins/Onan 5000 has an engine oil capacity of 3.5 liters (3.7 US quarts), per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan 5000?
The Cummins/Onan 5000 has a dry weight of 116 kg (255 lb).
What voltages is the Cummins/Onan 5000 available in?
The Cummins/Onan 5000 is offered in 120 V, AC-phase.
How many cold cranking amps does the Cummins/Onan 5000 require?
The Cummins/Onan 5000 uses 1 battery, 12 V each, 450 CCA, group 360, per the manufacturer specification sheet.
What air filter fits the Cummins/Onan 5000?
The Cummins/Onan 5000 uses air filter part number N20SB.
Troubleshooting
21Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Fails to crank | Low battery | Check battery electrolyte level |
| Fails to crank | Bad battery connection | Clean and tighten all battery and cable connections |
| Fails to crank | Blown fuse | Replace fuse on control box |
| Cranks slowly | Low battery | Check battery electrolyte level |
| Cranks slowly | Bad battery connection | Clean and tighten all battery and cable connections |
| Cranks slowly | Oil is too heavy | Replace with lighter oil |
| Cranks slowly | Load connected | Disconnect load while starting |
| Cranks but won't start | Fuel below genset pickup level in tank | Add fuel |
| Cranks but won't start | Fuel supply shutoff valve closed | Fully open fuel supply valve |
| Cranks but won't start | Carbon deposits on spark plugs | Remove spark plugs and clean |
| Cranks but won't start | Low oil level | Add oil if necessary |
| Exhausting black smoke | Rich fuel mixture | (Gasoline sets) Turn main fuel adjustment in 1/8 turn (see Figure 3-3). (Altitude adjustment only; otherwise, contact an Onan service center.) |
| Exhausting black smoke | Dirty air filter | Replace air filter |
| Exhausting black smoke | Choke stuck | Contact an Onan service center |
| Unit runs then stops | Out of fuel | Refill fuel tank |
| Unit runs then stops | Low oil level | Add oil if necessary |
| Unit runs then stops | Excess oil | Reduce engine oil level |
| Unit runs then surges | Loose or worn spark plug leads | Check security of spark plug leads at spark plug and ignition coil |
| Unit runs then surges | Ignition coil, wiring, or control components defective | Contact an Onan service center |
| Unit runs then surges | Faulty spark plugs | Remove and clean or replace |
| Unit runs then surges | Governor defective | Contact an Onan service center |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
16| Part # | Description | Qty | System | |
|---|---|---|---|---|
| AMX36239 | Manifold Gasket | Gasket | Amazon | |
| AN500T0122 | STARTER MOTOR - Aftermarket Manufacture | Starter | Amazon eBay | |
| AN500T0127 | STARTER MOTOR | Starter | Amazon eBay | |
| AN500T0134 | STARTER MOTOR | Starter | Amazon eBay | |
| AN500T0168 | STARTER DRIVE | Starter | Amazon eBay | |
| AN500T0169 | STARTER DRIVE | Starter | Amazon eBay | |
| AN500T0170 | STARTER DRIVE | Starter | Amazon eBay | |
| AN500T0171 | STARTER DRIVE | Starter | Amazon eBay | |
| AN500T0172 | STARTER DRIVE | Starter | Amazon eBay | |
| AN500T0173 | STARTER DRIVE | Starter | Amazon eBay | |
| N20SB | Breaker Ampere Rating 2000A | Air filter | Amazon eBay | |
| 40KIPOD | Breaker Padlocking Devices 5000A Frame | Service part / kit | Amazon | |
| LBCUM8.3T8950 | Core charge includes similar block core only Cast # - 3923275, 3926567, 3938058 | Service part / kit | buy | |
| SBMID40 | Internal and External Accessories 5000A Frame | Service part / kit | Amazon | |
| SBMIF40 | Internal and External Accessories 5000A Frame | Service part / kit | Amazon | |
| SBSS40 | Frame Size 5000A | Service part / kit | Amazon |
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.