Specifications
| Fuel | Natural gas or propane vapor (NG/LPV) |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 50 kW |
| Standby kVA | 63 |
| Emissions | EPA |
| Controller | PC 1.1, PC 2.3, PowerCommand 1.1 |
| Oil capacity | 15.1 L |
| Voltage options | 120/240 V, 120/208 V, 277/480 V |
| Phase | 1-phase,3-phase |
| Battery group | 34 |
| Battery cranking | 850 CCA |
| Battery voltage | 12 V |
| Coolant capacity | 16 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 3016×1016×1480 mm |
| Dry weight | 1090 kg |
| Sound level | 72.0 dBA @ 7 m |
Engine
| Oil capacity | 15.1 L |
|---|---|
| Coolant capacity | 16.0 L |
| Displacement | 5.88 L |
| Aspiration | Naturally aspirated or turbocharged (varies by generator set model) |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan QSJ5.9G| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 250 hr | |||
| Fuel filter | Check fuel lines and hoses: Visually check for leaks, worn or damaged hoses. To replace, contact your authorized distributor. | — | 24 hr | ||
| Oil filter | Replace engine oil and filters. Refer to the Engine Oil section for the procedure. | — | 250 hr | ||
| Battery | Check battery for general condition. Remove any corrosion on terminals with wire brush. | — | 50 hr | ||
| Belt | Checking drive belt condition and tension: Visually check belt for evidence of wear or slippage. To replace, contact your authorized distributor. | — | 24 hr | ||
| Coolant | Starts to open within 2 °F (1 °C) of 180 °F (82 °C); Fully open within 2 °F (1 °C) of 203 °F (95 °C); Flow valve and flange clearance (minimum): 0.26 in (6.6 mm) | — | 500 hr | ||
| Oil | Replace engine oil and filters. Refer to the Engine Oil section for the procedure. | — | 250 hr | ||
| Spark plug | 38 Nm (28 lb-ft) | — | 500 hr |
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50/50 mixture | below 50°C | Engine coolant – 50/50 mixture; generator set cooling capability 50 oC |
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
How many kW is the Cummins/Onan C50 N6?
The Cummins/Onan C50 N6 is rated 50 kW standby (63.0 kVA).
What engine is in the Cummins/Onan C50 N6?
The Cummins/Onan C50 N6 is powered by the Cummins/Onan QSJ5.9G engine.
What kind of fuel does the Cummins/Onan C50 N6 run on?
The Cummins/Onan C50 N6 runs on Natural gas or propane vapor (NG/LPV).
What's the oil capacity on a Cummins/Onan C50 N6?
The Cummins/Onan QSJ5.9G engine in the Cummins/Onan C50 N6 has an oil capacity of 15.1 liters.
How much coolant does the Cummins/Onan C50 N6 hold?
The Cummins/Onan C50 N6 cooling system holds 16 liters (4.2 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
How loud is the Cummins/Onan C50 N6?
The Cummins/Onan C50 N6 is rated at 72.0 dBA at 7 m, per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan C50 N6?
The Cummins/Onan C50 N6 has a dry weight of 1090 kg (2403 lb).
What voltages is the Cummins/Onan C50 N6 available in?
The Cummins/Onan C50 N6 is offered in 120/240 V, 120/208 V, 277/480 V, 1-phase,3-phase-phase.
What size battery does the Cummins/Onan C50 N6 need?
The Cummins/Onan C50 N6 uses 12 V each, 850 CCA, group 34, per the manufacturer specification sheet.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low AC Voltage at Startup | Loss of residual magnetism in the exciter stator lamination | Restore magnetism: attach leads to a 12VDC battery with a diode in one lead; run the generator at rated speed, no load; briefly (maximum one second) connect positive lead to control board terminal F1: P17-1 and negative lead to control board terminal F2: P17-2 |
| Unstable Voltage (No Load) | Engine governing unstable | Check for engine governor hunting with a frequency meter or tachometer, or cyclic irregularities in the engine with InPower; if any engine DTC fault codes are present, troubleshoot them using the E-Controls manual; check fuel supply pressure to ensure that it is consistent; ensure that the throttle assembly moves freely, clean it if necessary; check the spark plugs for buildup, ensure that a spark is present at each cylinder, repair or replace them if necessary; check for any exhaust restriction, clean or replace components as necessary; check for an intake leak, repair or replace components as necessary; check for proper function of the crankshaft and camshaft position sensors, and the wiring to the ECM from the sensors, repair or replace components as necessary; check the fuel mix control valve for proper operation, such that it can move freely and easily, clean or replace the valve if necessary |
| Unstable Voltage (No Load) | Loose or corroded connections | Check electrical connectors on terminals on the control board; check auxiliary terminals for loose connections; repair or replace as necessary |
| Unstable Voltage (No Load) | Intermittent ground on machine | Megger test all the windings, including the exciter stator; low insulation resistance can affect the PCC (disconnect the PCC before megger test) |
| Unbalanced Voltage (With Load) | Alternator loads unbalanced | Check that loads are balanced on each leg of alternator output (L1, L2, L3) |
| Unbalanced Voltage (With Load) | Engine governing unstable | Check for engine governor hunting with a frequency meter or tachometer, or cyclic irregularities in the engine with InPower; if any engine DTC fault codes are present, troubleshoot them using the E-Controls manual; check fuel supply pressure to ensure that it is consistent; ensure that the throttle assembly moves freely, clean it if necessary; check the spark plugs for buildup, ensure that a spark is present at each cylinder, repair or replace components as necessary; check for any exhaust restriction, clean or replace components as necessary; check for an intake leak, repair or replace components as necessary; check for proper function of the crankshaft and camshaft position sensors, and the wiring to the ECM from the sensors, repair or replace components as necessary; check the fuel mix control valve for proper operation, such that it can move freely and easily, clean or replace the valve if necessary |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan C50 N6 troubleshooting guide (145 entries) →
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| A026M166 | accessory seal kit | Seal | Amazon eBay | |
| B180313494 | Onan C50N6 March Inspection | 1 | Service type | Amazon eBay |
| 3824510 | Cummins electronic cleaner | 1 | Service part / kit | Amazon eBay |
| A047A982 | EControls GCP E-Com USB interface cable | 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.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 321.6 | 84.96 | |
| Prime | 100% | 7.77 | 2.05 |
| Standby | 806.3 | 213.0 | |
| Standby | 25% | 15.07 | 3.98 |
| Standby | 50% | 21.31 | 5.63 |
| Standby | 75% | 26.46 | 6.99 |
| Standby | 100% | 33.46 | 8.84 |
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.