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Home›Cummins/Onan›Cummins/Onan NH

Cummins/Onan NH Generator Set

The Cummins/Onan NH is a 4 kW (115.9 kVA) Gasoline, LPG standby generator set powered by a Cummins/Onan NHC engine. It is available at 120 V and 240 V, Single-phase, 60 Hz and rated 35.7 A. It holds about 3.8 L (1.0 gal) of oil, with a maximum ambient rating of 49 °C. Starting uses battery rated 360 CCA at 12 V. The set measures 635×478×356 mm (25.0×18.8×14.0 in) and weighs about 97.9 kg (216 lb). An integrated tank holds 15.2 L (4.0 gal), roughly 3.8 hours of runtime.

4 kW
Standby
1.0 L
Displacement
3.8 L
Oil capacity
3
Document types

How to read your Cummins/Onan serial & model number →

Specifications

FuelGasoline, LPG
Frequency60.0 Hz
Standby power4 kW
Prime power4500 kW
Oil capacity3.8 L
Voltage options120 V, 240 V
PhaseSingle
Rated current35.7 A
Power factor0.8
Circuit breaker60 A
Battery cranking360 CCA
Battery voltage12 V
Max ambient49 °C
Dimensions (L×W×H)635×478×356 mm
Dry weight104 kg
Fuel tank15.2 L
Tank runtime3.8 hr

Engine

Cummins/Onan NHC
Oil capacity4.0 L
Displacement1.0 L
AspirationAir-cooled
Rated speed3600 rpm

Maintenance & consumables

for the Cummins/Onan NHC
ItemSpecCapacityPart #Interval
Air filter—500 hr find
Fuel filter—1000 hr find
Oil filter—1000 hr find
Belt—500 hr find
Coolant3.8 quart—1000 hr
Coolant filter— find
Oil3.8 litre—50 hr

Common questions

What is the power rating of the Cummins/Onan NH?

The Cummins/Onan NH is rated 4 kW standby.

What engine does the Cummins/Onan NH use?

The Cummins/Onan NH is powered by the Cummins/Onan NHC engine.

What fuel does the Cummins/Onan NH use?

The Cummins/Onan NH runs on Gasoline, LPG.

What is the oil capacity of the Cummins/Onan NH?

The Cummins/Onan NHC engine in the Cummins/Onan NH has an oil capacity of 4.0 liters.

Troubleshooting

1

Symptoms & remedies

SymptomRemedy
Engine runs unevenly at half or full load due to faulty carburetion1. Start engine and allow it to warm up. 2. Push in on the governor mechanism to slow the unit down to about 400 to 500 rpm. 3. Set idle adjustment so engine runs smoothly. 4. Release governor mechanism to allow engine to accelerate. If engine accelerates evenly and without hesitation, main adjustment is correct. If not, turn needle outward about one half turn and again slow the engine down and release the mechanism. Continue until the engine accelerates evenly and without a hesitation after releasing the governor. 5. If engine tends to hunt (alternate increase and decrease of speed), open the main adjusting needle a little more. Do not open more than one half turn beyond the maximum power point.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

48
Part #DescriptionQtySystem
420-0105Valve rotatorTool buy
420-0119Valve spring compressorTool buy
420-0146Ring spreaderTool buy
420-0181OIL SEAL GUIDE AND DRIVER, REAR BEARING PLATE INCLUDES OIL SEAL LOADERSeal buy
420-0313OIL SEAL GUIDE AND DRIVERSeal buy
525-0305Onan green spray cansPaint buy
940-0751Oil Filter, Full Flow1Oil filter buy
940-0752Oil Filter Housing1Oil filter buy
965-0248BATTERY1Battery buy
965-0373SPARK PLUG1Spark plug buy
CS-1000FLYWHEEL PULLERFlywheel puller dieselpartscenter $2.85
CS-1274NOISE SHIELDNoise shield buy
ES-1022CYLINDRICAL TOOLTool buy
ES-1373Testing Coil SecondaryTesting coil secondary buy
ES-1592-2Breaker Point Ignition SystemBreaker point ignition system buy
FS-1440-3CARBURETOR ASSEMBLYCarburetor buy
FS-1485FUEL SHUT-OFF VALVEFuel shutoff valve buy
FS-1486PLUNGER ASSEMBLYFuel pump buy
FS-1487PUMP ASSEMBLYFuel pump buy
FS-1879O-RING SUPP0RT THE END OF THE PREWATER MERTITSeal buy
28-32Center Screw1Service part / kit atldiesel $7.87
300-0985CONTROL ASSEMBLY, REMOTE (INCLUDES PARTS MARKED +) + PANEL, CONTROL *+SWITCH, ROCKER1Service part / kit buy
300-0986* - Included in 300-0986 Control Assembly1Service part / kit buy
323-1486SocketsService part / kit buy
323-1487-04Onan 16-Socket ConnectorService part / kit buy
420-0071VALVE SEAT DRIVERService part / kit buy
420-0100FLYWHEEL PULLER PLATEService part / kit buy
420-0106TORQUE WRENCH COVER DRIVERService part / kit buy
420-0107SNAP RING PLIERService part / kit buy
420-0214RING COMPRESSOR, EXPANSION BEARING REMOVERService part / kit buy
420-0248CRANK GEAR PULLER RINGService part / kit buy
420-0249CCK, NB, NH, NHA, NHB, NHCService part / kit buy
420-0256PLASTI-GAGE .002 - .006Service part / kit buy
420-0294CARBURETOR ADJUSTMENT WRENCHService part / kit buy
420-0296TIMING ADVANCE MECHANISMService part / kit buy
420-0300VALVE GUIDE DRIVERService part / kit buy
420-0324COMBINATION MAIN AND CAM GEAR COVERService part / kit buy
420-0332Piston ring groove cleanerService part / kit buy
6-15For LPG Gensets: Turn the idle mixture screw out 1-1/4 turns and the main fuel mixture screw out 2-1/2 turns so that the engine will start and run.Service part / kit buy
6-16For LPG Gensets: Turn the idle mixture screw out 1-1/4 turns and the main fuel mixture screw out 2-1/2 turns so that the engine will start and run.Service part / kit buy
6-17For LPG Gensets: Turn the idle mixture screw out 1-1/4 turns and the main fuel mixture screw out 2-1/2 turns so that the engine will start and run.Service part / kit buy
6-18For LPG Gensets: Turn the idle mixture screw out 1-1/4 turns and the main fuel mixture screw out 2-1/2 turns so that the engine will start and run.Service part / kit buy
940-0153Operators HBSService part / kit buy
940-0403Parts CatalogService part / kit buy
940-0753Major Service ManualService part / kit buy
B389TIMING MARKService part / kit buy
FS-1613SPEED ADJUSTMENT NUTService part / kit buy
FS-1683FLOAT LEVEL ADJUSTMENTService 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.

Fuel consumption

RatingLoadL/hgal/h
Prime
Standby

Available documents

Parts manualService manualspec_sheet