Service parts for the x12
Grouped by system, with how many of each the parts manual calls for.
Fuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Standby power | 250 kW |
|---|---|
| Emissions | Stage V / Tier 4 Final |
| Oil capacity | 673.0 L |
| Dimensions (L×W×H) | 2210×1429×1916 mm |
| Dry weight | 1812 kg |
Engine
| Oil capacity | 673.0 L |
|---|---|
| Coolant capacity | 508.0 L |
| Displacement | 12.0 L |
| Aspiration | Wastegate Turbo |
| Rated speed | 2000 rpm |
Filters for the Cummins/Onan X12
1Engine-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.
Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Fuel / water separator | P550849 | Fuel Filter, Water Separator Cartridge | CUMMINS 3944901S, NAPA 3763, BALDWIN PF7928, DAVCO 102526 | FridayParts $20.90 KuduParts $39.00 |
Maintenance & consumables
for the Cummins/Onan X12| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Remote mount filter | FF5971NN | Amazon eBay $112.00 KuduParts $29.00 | ||
| Oil filter | Lubricating Oil Filter | LF9070 | Amazon eBay $50.00 KuduParts $68.00 | ||
| Oil | Lube oil capacity (with filter) | — | 40000 hr | ||
| Spark plug | Valve lash check | — |
Service intervals
1| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| ELIMINATOR self cleaning filter core | Other | 1500 hr | Requires servicing only every 1,500 hours. Saves up to 90% of lube system maintenance costs and increases productivity. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What size generator is the Cummins/Onan x12?
The Cummins/Onan x12 is rated 250 kW standby.
Which engine powers the Cummins/Onan x12?
The Cummins/Onan x12 is powered by the Cummins/Onan X12 engine.
What's the oil capacity on a Cummins/Onan x12?
The Cummins/Onan X12 engine in the Cummins/Onan x12 has an oil capacity of 673.0 liters.
What is the cooling system capacity of the Cummins/Onan x12?
The Cummins/Onan x12 cooling system holds 508 liters (134.2 US gallons) for the engine, per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan x12?
The Cummins/Onan x12 has a dry weight of 1812 kg (3994 lb).
Which oil filter part number does the Cummins/Onan x12 take?
The Cummins/Onan x12 uses oil filter part number LF9070.
Which fuel filter part number does the Cummins/Onan x12 take?
The Cummins/Onan x12 uses fuel filter part number FF5971NN.
Parts
14| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 5395072 | Crankshaft Front Oil Seal Removal & Installation Kit for X12 engines with lip seal | Seal | eBay | |
| 5395506 | Crankshaft Front Oil Seal Removal & Installation Kit | Multiple | Seal | buy |
| 5395574 | NOx Sensor Cup Drill Bushing Kit | Multiple | Sensor | buy |
| B4.5 | 90-149 kW (120-200 hp) | 1 | Engine | Amazon SinoCMP $1269.00 |
| B6.7 | 116-209 kW (155-280 hp) | 1 | Engine | SinoCMP $369.00 |
| CV50626 | Crankcase Breather Element | 1 | Crankcase breather element | eBay FridayParts $58.88 |
| CV50633 | Crankcase Breather Element | 1 | Crankcase breather element | eBay $38.49 FridayParts $68.00 KuduParts $68.00 |
| F3.8 | 55 kW (74 hp) | 1 | Engine | KuduParts $135.00 |
| FF5776 | Fuel Filter (Pressure) | 1 | Fuel filter | eBay KuduParts $67.00 FridayParts $69.00 |
| FF5825 | Fuel Filter (Pressure) | 1 | Fuel filter | buy |
| FF5971NN | Extended life fuel filter (up to 75,000 miles) | 1 | Fuel filter | Amazon eBay $112.00 KuduParts $29.00 |
| LF9070 | Lubricating Oil Filter | 1 | Oil filter | Amazon eBay $50.00 KuduParts $68.00 |
| 5395567 | Gauge, Sight | Service part / kit | eBay | |
| 5572847 | Oil Cooler Leak Test Kit | Multiple | Service part / kit | buy |
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 10 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.