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Generac NP-50LP Generator Set

The Generac NP-50LP is a 5.5 kW (4.5 kVA) LP Gas prime generator set powered by a Generac GN-410 engine. It operates at 60 Hz. It holds about 1.4 L (0.4 gal) of oil.

0.41 L
Displacement
1.4 L
Oil capacity
3
Document types

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Specifications

FuelLP Gas
Frequency60.0 Hz
Standby kVA4
Prime power5 kW
Oil capacity1.4 L

Engine

Generac GN-410
Oil capacity1.4 L
Displacement0.41 L
AspirationAir-cooled
Rated speed3600 rpm

Maintenance & consumables

for the Generac GN-410
ItemSpecCapacityPart #Interval
Air filter73111100 hr Amazon eBay $45.12
Fuel filter87769100 hr Amazon eBay $18.99
Oil filter07018525 hr Amazon eBay $19.97
Oil1.5—100 hr

Common questions

What engine does the Generac NP-50LP use?

The Generac NP-50LP is powered by the Generac GN-410 engine.

What fuel does the Generac NP-50LP use?

The Generac NP-50LP runs on LP Gas.

What is the oil capacity of the Generac NP-50LP?

The Generac GN-410 engine in the Generac NP-50LP has an oil capacity of 1.4 liters.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
The engine cannot be crankedThe fuse element has melted open due to overloadingReplace the fuse with an identical replacement
Engine won't crank.1. 15 amp fuse blown.1. Replace fuse.
Engine cranks but won't start1. Out of fuel1. Replenish fuel.
Engine starts hard, runs rough1. Dirty air cleaner.1. Clean or replace elements as needed.
Engine starts, shuts down when Start/Stop switch is released.1. Engine oil level is low.1. Check oil and add oil as needed.
No AC output from generator1. Check main line circuit breaker.1. Reset to ON or CLOSED.

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

Parts

117
Part #DescriptionQtySystem
021713BCYLINDER HEAD GASKET1Gasket buy
029459SPRING, BELT TENSION2Belt buy
030340HOSE, FUEL, 4.5" LG.1Hose buy
067805OIL SEAL1Seal buy
067816VALVE SPRING4Belt buy
067866O-RING1Seal buy
067897EXHAUST GASKET2Gasket buy
067920VALVE COVER GASKET2Gasket buy
067924OIL SEAL ASSEMBLY1Seal buy
069332CYLINDER HEAD GASKET2Gasket buy
069336OIL SUMP GASKET1Gasket buy
070122VALVE STEM SEAL4Seal buy
070185FILTER, OIL (FRAM#PH3614)1Oil filter Amazon eBay $19.97
070185BFILTER, OIL1Oil filter Amazon eBay $12.95
070547OIL PUMP ASSEMBLY1Pump buy
070596BREATHER TUBE1Hose buy
072347SPARK PLUG2Spark plug Amazon eBay $2.50
073111FILTER, AIR1Air filter Amazon eBay $20.49
073123AIR FILTER (NOT SHOWN)1Air filter Amazon eBay $28.00
074994HOSE, 1/2" I.D. PETROLEOM1Hose buy
075258ENGINE GASKET KIT1Gasket buy
076701CRANKCASE GASKET1Gasket buy
077643EXHAUST PIPE GASKET1Gasket buy
078672SEAL, VALVE STEM1Seal buy
081646PRE-CLEANER, AIR FILTER1Air filter buy
086999GASKET, OIL FILTER SUPPORT1Gasket buy
087769FUEL FILTER1Fuel filter Amazon eBay $49.99
089228GASKET, CARB/MANIFOLD1Gasket buy
090239GASKET, EXHAUST MANIFOLD1Gasket buy
090970GASKET, CARB/AIR FILTER1Gasket buy
091039GASKET, MANIFOLD/HEAD1Gasket buy
0A6858GASKET, COLLECTOR PAN1Gasket buy
0A7975GOVERNOR GEAR ASSEMBLY1Pump buy
0A8010GASKET, BLOWER HOUSING1Gasket buy
0A8010AGASKET, BLOWER HOUSING1Gasket buy
0A8407GASKET, BLOWER SIDE1Gasket buy
0A8726GASKET, BLOWER / PAN1Gasket buy
0A9539OIL DRAIN HOSE ASSEMBLY1Hose buy
0C3150ROCKER COVER GASKET1Gasket buy
0C4647GASKET, SOLENOID1Gasket buy
0C6066SEAL, INLET REGULATOR1Seal buy
0C6069GASKET, DIAPHRAGM1Gasket buy
0E3812CRANKSHAFT SEAL2Seal buy
0E7585SPARK PLUG, CHAMP1Spark plug Amazon eBay $15.99
21713BCYLINDER HEAD GASKETGasket buy
70185FILTER, OIL1Oil filter Amazon eBay $10.49
72347SPARK PLUG1Spark plug Amazon eBay $19.45
72655CRANKSHAFT 35 I.D. SEALSeal buy
73174FILTER, AIR CARB.1Air filter buy
76701CRANKCASE GASKETGasket buy
77158OIL SCREEN PICKUP ASSEMBLYPump eBay $13.03
78672SEAL, VALVE STEMSeal buy
80308BREATHER GASKETGasket buy
86002OUTER GEROTORPump buy
86026INNER GEROTORPump buy
86254"O" RING 17.8 I.D. x 2.4 THICKSeal buy
C3150ROCKER COVER GASKETGasket buy
075242SPRING, GENERATOR MOUNT4Service part / kit buy
075252KIT, CARBURETOR OVERHAUL1Service part / kit buy
075271VALVE OVERHAUL KIT1Service part / kit buy
086516EXHAUST VALVE1Service part / kit buy
086517INTAKE VALVE1Service part / kit buy
092120NUT LOCK TRIC M6-1.02Service part / kit buy
0A5771OIL PRESSURE SPRING1Service part / kit buy
0A6778SPRING, A/L GOV. LEVER-BELLCRANK1Service part / kit buy
0A6780SPRING, A/L BELLCRANK-CARB.1Service part / kit buy
0A8222SPRING, GOVERNOR1Service part / kit buy
0C4391VALVE SPRING2Service part / kit buy
0C5764ASPRING, REGULATOR 45N/M 29MM1Service part / kit buy
0C6070SPRING-SOLENOID PLUNGER1Service part / kit buy
21533PISTON RING SETService part / kit buy
21714CYLINDER HEAD W/VALVE SEATS AND GUIDESService part / kit buy
21742M10 1.5 x 105MM HHFLService part / kit buy
26925PIPE PLUG-3/8"Service part / kit buy
45756M6-1.0 x 10 TAPTITEService part / kit buy
71978CONNECTING ROD WITH CAP AND BOLTService part / kit buy
71980PISTON PINService part / kit buy
71983PISTON PIN RETAINERService part / kit buy
72694PIVOT BALL STUDService part / kit buy
72696JAM NUT (ROCKER ARM)Service part / kit buy
74908M5-0.8 x 10MM TAPTITEService part / kit buy
76329OIL FILL PLUGService part / kit buy
76361THRUST WASHERService part / kit buy
78645GOVERNOR RETAINER (C-RING)Service part / kit buy
78658GOVERNOR ARM "R" PINService part / kit buy
78659THRUST WASHERService part / kit buy
78691COVER, OIL PRESSURE RELIEFService part / kit buy
78694PUSH ROD GUIDE PLATEService part / kit buy
79246M6-1.0 x 16MM HEX HEAD. SCREW. AND LOCK WASHERService part / kit buy
80309BREATHER COVERService part / kit buy
80338OIL BREATHER SEPARATORService part / kit buy
83897TAPPET, SOLIDService part / kit buy
83907ROCKER ARMService part / kit buy
83921BEARING TUBE SHAFTService part / kit buy
84430BALANCERService part / kit buy
86514VALVE SPRING RETAINERService part / kit buy
86515VALVE SPRING KEEPERService part / kit buy
86516EXHAUST VALVEService part / kit buy
86517INTAKE VALVEService part / kit buy
88396BPUSH RODService part / kit buy
89280DOIL SUMP ASSEMBLYService part / kit buy
89673WASHER, VALVE SPRINGService part / kit buy
90416ACRANKSHAFT ASSEMBLYService part / kit buy
90747BREATHER VALVE ASSEMBLYService part / kit buy
91308VALVE SPRINGService part / kit buy
92362ROCKER COVER W/FILLService part / kit buy
93064OIL FILL CAP ASSEMBLYService part / kit buy
96699PISTONService part / kit buy
A1442FLANGED HEX HD. CAP-SCREW M8-1.25 x 42Service part / kit dieselpartscenter $36.68
A5776PRESSURE RELIEF BALLService part / kit buy
A5S771OIL PRESSURE SPRINGService part / kit buy
A7308GOVERNOR SPOOLService part / kit buy
A7628GOVERNOR ARM RC45Service part / kit buy
A8930GOVERNOR GEAR ASSEMBLYService part / kit buy
A9877CAMSHAFT ASSEMBLYService part / kit buy
B2104SPRING WASHERService part / kit buy
C3396CCRANKCASE SUB ASSEMBLYService 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
Prime0%0.610.16
Prime0%0.980.26
Prime0%1.360.36
Prime1%1.630.43
Prime100%0.47
Standby25%0.80.21
Standby50%1.780.47
Standby75%2.350.62
Standby100%3.140.83

Available documents

Installation manualOwner's manualParts manual

Other sets with this engine

Generac NP-50GGenerac PRIMEPACT 50