Service parts for the C125 D6D
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 | diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 125 kW |
| Standby kVA | 156 |
| Prime power | 113 kW |
| Emissions | EPA Tier 3 |
| Controller | 2.3, PowerCommand 1.1 |
| Oil capacity | 2.0 L |
| Alternator | N/A (2-pole) |
| Voltage options | 120/240 V, 120/208 V, 277/480 V, 347/600 V, 127/220 V |
| Phase | 1 / 3 |
| Battery group | 2 x 850 amps |
| Battery cranking | 850 CCA |
| Battery voltage | 12 V |
| Battery quantity | 2 |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2867×1016×1415 mm |
| Dry weight | 125 kg |
| Wet weight | 1470 kg |
Engine
| Oil capacity | 2.0 L |
|---|---|
| Displacement | 6.69 L |
| Aspiration | Turbocharged and charge air cooled |
| Rated speed | 1800 rpm |
Filters for the Cummins/Onan QSB7
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.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P550428 | Lube Filter, Spin-On Full Flow | CUMMINS 3937144, CUMMINS 3937736, NAPA 7182, TEREX 0704970120 | KuduParts $61.00 FridayParts $62.99 |
Maintenance & consumables
for the Cummins/Onan QSB7| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Filter, Air − Heavy Duty | A054E584 | Amazon eBay | ||
| Fuel filter | Strata pore fuel filter | — | 500 hr | ||
| Oil filter | Strata pore lube oil filter | — | 1000 hr | ||
| Battery | 12 | — | |||
| Belt | — | 1000 hr | |||
| Coolant | -45 | — | |||
| Oil | 18.9 | — | |||
| Spark plug | — | 500 hr |
Service specifications
8| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | AC waveform Total Harmonic Distortion (THDV) | < 5% no load to full linear load, < 3% for any single harmonic | % | |
| Other | Frequency regulation | Isochronous | ||
| Other | Governor regulation class | ISO8528 Part 1 Class G3 | ||
| Other | Random frequency variation | ± 0.50 | % | |
| Other | Telephone Harmonic Factor (THF) | < 3 | % | |
| Other | Telephone Influence Factor (TIF) | < 50 | per NEMA MG1-22.43 | |
| Voltage | Random voltage variation | ± 1.0 | % | |
| Voltage | Voltage regulation, no load to full load | ± 1.0 | % | no load to full load |
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 is the power rating of the Cummins/Onan C125 D6D?
The Cummins/Onan C125 D6D is rated 125 kW standby (156.0 kVA).
Which engine powers the Cummins/Onan C125 D6D?
The Cummins/Onan C125 D6D is powered by the Cummins/Onan QSB7 engine.
Is the Cummins/Onan C125 D6D diesel or gas?
The Cummins/Onan C125 D6D runs on diesel.
How much oil does the Cummins/Onan C125 D6D take?
The Cummins/Onan QSB7 engine in the Cummins/Onan C125 D6D has an oil capacity of 2.0 liters.
What is the prime power rating of the Cummins/Onan C125 D6D?
The Cummins/Onan C125 D6D is rated 113 kW prime (141 kVA), against 125 kW standby.
How much does the Cummins/Onan C125 D6D weigh?
The Cummins/Onan C125 D6D has a dry weight of 125 kg (275 lb).
What voltage does the Cummins/Onan C125 D6D produce?
The Cummins/Onan C125 D6D is offered in 120/240 V, 120/208 V, 277/480 V, 347/600 V, 127/220 V, 1 / 3-phase.
What battery does the Cummins/Onan C125 D6D use?
The Cummins/Onan C125 D6D uses 2 batteryies, 12 V each, 850 CCA, group 2 x 850 amps, per the manufacturer specification sheet.
What alternator does the Cummins/Onan C125 D6D use?
The Cummins/Onan C125 D6D uses a N/A alternator. It has 2 poles.
What air filter does the Cummins/Onan C125 D6D use?
The Cummins/Onan C125 D6D uses air filter part number A054E584.
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 4915973 | Alternator Manual | Alternator | Amazon eBay | |
| A047M180 | Filter, Air − Normal Duty | 1 | Air filter | Amazon eBay $248.27 |
| A054E584 | Filter, Air − Heavy Duty | 1 | Air filter | Amazon eBay |
| A055Z870 | Filter, Air − Replacement − Heavy Duty | 1 | Air filter | Amazon eBay $251.32 |
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.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 34.07 | 9.0 | |
| Standby | 15.9 | 4.2 |
Available documents
This page was generated from the 5 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.