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Home›Generac›Generac NP-66G

Generac NP-66G Generator Set

The Generac NP-66G is a 6.6 kW Gasoline standby generator set powered by a Generac GN-480 engine. It is available at 120 V and 240 V, 1-phase, 60 Hz and rated 55 A. It holds about 1.7 L (0.4 gal) of oil.

6 kW
Standby
0.48 L
Displacement
1.7 L
Oil capacity
1
Document types

How to read your Generac serial & model number →

Specifications

FuelGasoline
Frequency60.0 Hz
Standby power6 kW
Oil capacity1.7 L
Voltage options120 V, 240 V
Phase1
Rated current55 A
Circuit breaker30 A

Engine

Generac GN-480
Oil capacity1.4 L
Displacement0.48 L
AspirationAir-cooled
Rated speed2500 rpm

Maintenance & consumables

for the Generac GN-480
ItemSpecCapacityPart #Interval
Air filterpaper element73123360 hr Amazon eBay $28.00 PartsGeek
Fuel filter087769100 hr Amazon eBay $49.99 PartsGeek
Oil filter70185120 hr Amazon eBay $10.49 PartsGeek
Belt40" Poly Vinyl 4L Belt75216360 hr Amazon eBay $49.99 PartsGeek
Coolantcheck level, add if necessary—12 hr
OilSAE 10W-301.7 L—100 hr

Common questions

What is the power rating of the Generac NP-66G?

The Generac NP-66G is rated 6 kW standby.

What engine does the Generac NP-66G use?

The Generac NP-66G is powered by the Generac GN-480 engine.

What fuel does the Generac NP-66G use?

The Generac NP-66G runs on Gasoline.

What is the oil capacity of the Generac NP-66G?

The Generac GN-480 engine in the Generac NP-66G has an oil capacity of 1.4 liters.

Troubleshooting

3

Symptoms & remedies

SymptomCauseRemedy
Engine won't crank15 amp fuse blown.<br>Loose, corroded or defective battery cable(s).<br>Battery is discharged or defective.<br>Defective starter contactor.<br>Defective starter motor.<br>Defective control relay (CR1).1. Replace blown fuse.<br>2. Tighten, clean or replace, as necessary.<br>3. Recharge or replace battery.<br>4. Replace starter contactor.<br>5. Replace starter motor.<br>6. Replace control relay.
Engine cranks, won't startOut of fuel.<br>Fuel shutoff valve is closed.<br>Fuel pump not operating.<br>Automatic choke not operating properly.<br>Engine is flooded.<br>Fuel filter is clogged.<br>Defective Controller Circuit Board.<br>Engine spark plugs defective.<br>Bad ignition magneto on engine.<br>Bad carburetor.<br>Dirty air cleaner.1. Refill fuel tank.<br>2. Open fuel shutoff valve(s).<br>3. Repair or replace pump.<br>4. Repair, replace or adjust properly.<br>5. Wait 5-10 minutes; try again.<br>6. Replace filter if clogged.<br>7. Replace bad circuit board.<br>8. Clean, regap or replace as needed.<br>9. Replace if defective,<br>10. Adjust, repair or replace.<br>11. Clean or replace as needed.
Engine starts hard, run roughDirty engine air cleaner.1. Clean or replace as needed.

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

Parts

130
Part #DescriptionQtySystem
030340Hose, Fuel, 4.5" LG.1Hose PartsGeek
047290HOSE-3/8" I.D. #6L0LA1Hose PartsGeek
066480AIR CLEANER GASKET1Gasket PartsGeek
067158INTAKE MANIFOLD GASKET1Gasket PartsGeek
067805OIL SEAL1Seal PartsGeek
067816VALVE SPRING4Belt PartsGeek
067866O-RING1Seal PartsGeek
067866AO-RING1Seal PartsGeek
067871O-RING, CAP1Seal PartsGeek
067888OIL SEAL ASSEMBLY1Seal PartsGeek
067895INTAKE MANIFOLD GASKET2Gasket PartsGeek
067897EXHAUST GASKET2Gasket PartsGeek
067920VALVE COVER GASKET2Gasket PartsGeek
067924OIL SEAL ASSEMBLY1Seal PartsGeek
068548GASKET, OIL FILTER ADAPTER1Gasket PartsGeek
068554AOIL PUMP O-RING1Seal PartsGeek
068573OIL PUMP O-RING1Seal PartsGeek
069325OIL SUMP GASKET1Gasket PartsGeek
069332CYLINDER HEAD GASKET2Gasket PartsGeek
069336OIL SUMP GASKET1Gasket PartsGeek
069341FOAM PRE-CLEANER1Air filter PartsGeek
069379CARBURETOR MOUNTING GASKET2Gasket PartsGeek
070122VALVE STEM SEAL4Seal PartsGeek
070169SEALING WASHER4Seal PartsGeek
070185FILTER, OIL (FRAM#PH3614)1Oil filter Amazon eBay $19.97 PartsGeek
070506OIL GALLEY O-RING1Seal PartsGeek
070547OIL PUMP ASSEMBLY1Pump PartsGeek
070594CARBURETOR MOUNTING GASKET1Gasket PartsGeek
070596BREATHER TUBE1Hose PartsGeek
070597AIR INLET TUBE1Hose PartsGeek
072315BREATHER GASKET1Gasket PartsGeek
072347SPARK PLUG2Spark plug Amazon eBay $2.50 PartsGeek
072383GASKET, COLLECTOR PAN2Gasket PartsGeek
072384-CPUMP, FUEL1Pump PartsGeek
073123AIR FILTER (NOT SHOWN)1Air filter Amazon eBay $28.00 PartsGeek
0749941/2" I.D. X 10" LONG HOSE1Hose PartsGeek
075216BELT (POLY V 4L)-40"1Belt PartsGeek
075229SLIDE PAN, GASKET1Gasket PartsGeek
075253WASHER VALVE COVER SEAL4Seal PartsGeek
075258ENGINE GASKET KIT1Gasket PartsGeek
075281SWITCH, HIGH TEMPERATURE1Sensor PartsGeek
077643GASKET, EXHAUST OUTLET1Gasket PartsGeek
079678RING, SEALING2Seal PartsGeek
087769FUEL FILTER1Fuel filter Amazon eBay $49.99 PartsGeek
087770Line, Fuel - 5/16" I.D.1Hose PartsGeek
090141GASKET, EXHAUST OUTLET1Gasket PartsGeek
090475FUEL PUMP1Pump PartsGeek
091481GASKET AND CAP ASSEMBLY1Gasket PartsGeek
0A5508OIL FILL TUBE GASKET1Gasket PartsGeek
0A8584OIL FILTER1Sensor PartsGeek FridayParts $31.60
30340HOSE - FUEL, 4.5" LG.1Hose PartsGeek
42633BELT (POLY V 4L)-40"1Belt PartsGeek
47662-T4-1/2" long Fuel Hose1Hose PartsGeek
60108GASKET, OIL FILTER SUPPORT1Sensor PartsGeek
66480GASKET, AIR CLEANER1Gasket PartsGeek
67805Oil Seal1Seal PartsGeek
67866O-ring4Seal PartsGeek
67866AO-RING1Seal PartsGeek
67871O-ring Cap1Seal PartsGeek
67895Intake Manifold Gasket2Gasket PartsGeek
67897GASKET, EXHAUST2Gasket PartsGeek
67920Valve Cover Gasket2Gasket PartsGeek
67924Oil Seal Assembly1Seal PartsGeek
68548Oil Pad Gasket1Gasket PartsGeek
68554SEAL, GOVERNOR SHAFT1Seal PartsGeek
68554AGOVERNOR SHAFT SEAL1Seal PartsGeek
68573Oil Pump O-ring1Seal PartsGeek FridayParts $79.99
69332GASKET-CYLINDER HEAD2Gasket PartsGeek
69336Oil Sump Gasket1Gasket PartsGeek
69341PRE-FILTER1Air filter Amazon eBay $549.99 PartsGeek
69379GASKET, CARBURETOR MNTG.2Gasket PartsGeek
70122Valve Stem Seal4Seal PartsGeek
70169Sealing Washer4Seal PartsGeek
70185Oil Filter (FRAM PH #3614)1Oil filter Amazon eBay $10.49 PartsGeek
70189Sealing Washer4Seal PartsGeek FridayParts $379.99
70506Oil Galley O-ring1Seal PartsGeek
70536Oil Screen1Oil filter PartsGeek
70547Oil Pump Assembly1Pump PartsGeek
70596Breather Tube1Hose PartsGeek
70597Air Inlet Tube1Hose PartsGeek
72315GASKET, BREATHER1Gasket PartsGeek
72347SPARK PLUG-CHAMPION RC12YC2Spark plug Amazon eBay $19.45 PartsGeek
72383GASKET, COLLECTOR PAN2Gasket PartsGeek
73123Air Filter1Air filter Amazon eBay $28.00 PartsGeek
73174GASKET, EXHAUST MANIFOLD1Gasket PartsGeek
73179FILTER, OIL (FRAMHPH3614)1Sensor PartsGeek
74027SWITCH, HIGH TEMP.1Sensor PartsGeek kuduparts $140.00
74950TUBE, OUTER OIL1Hose PartsGeek
74951TUBE, INNER OIL1Hose PartsGeek
749941/2" I.D. x 10" LONG HOSE1Hose PartsGeek
7512-4O-ring DrainSeal PartsGeek
75209GASKET, COLLECTOR PAN1Gasket PartsGeek
75215GASKET, EXHAUST MANIFOLD1Gasket PartsGeek
75216BELT (POLY V 4L)-40"1Belt Amazon eBay $49.99 PartsGeek
75224BGASKET, COLLECTOR PAN1Gasket PartsGeek
75229Slide Pan Gasket1Gasket PartsGeek
75253Washer Valve Cover Seal4Seal PartsGeek
75258GASKET KIT-ENGINE1Gasket PartsGeek
75262SEAL, BREATHER SCREW1Seal PartsGeek
75263SEAL, BREATHER SCREW1Seal PartsGeek
75281GASKET, OIL FILTER SUPPORT1Sensor PartsGeek
75710ATUBE, OIL FILL AND DRAIN1Hose PartsGeek
75711O-ring Adaptor1Seal PartsGeek
75712O-ring Drain1Seal PartsGeek
77114Exhaust Outlet Gasket2Gasket PartsGeek
77643GASKET, EXHAUST OUTLET2Gasket PartsGeek
77667Oil Pressure Switch1Sensor PartsGeek
78229SLIDE PAN, GASKET1Gasket PartsGeek
79678RING, SEALING2Seal PartsGeek
87769Fuel Filter1Fuel filter Amazon eBay $18.99 PartsGeek
87770Fuel Line1Hose PartsGeek
87895Intake Manifold Gasket2Gasket PartsGeek
89965Cylinder Head Gasket2Gasket PartsGeek
90475Fuel Pump1Pump eBay $25.93 PartsGeek
91481Gasket and Cap Assembly1Gasket PartsGeek
A5508OIL FILL TUBE GASKET1Gasket PartsGeek
A858410 PSI-SWITCH, OIL PRESSURE1Sensor PartsGeek
Champion.RC12YCSpark PlugSpark plug PartsGeek
075249STANDARD PISTON RING SET2Service part / kit PartsGeek
075250STANDARD PISTON RING2Service part / kit PartsGeek
075252Kit, Carburetor Overhaul1Service part / kit PartsGeek
075271VALVE OVERHAUL KIT1Service part / kit PartsGeek
092120NUT LOCK TRIC M6-1.02Service part / kit PartsGeek
22676FUSE AGC-15A.1Service part / kit PartsGeek
70535Oil Screen1Service part / kit PartsGeek
75252KIT, CARBURETOR OVERHAUL - NOT SHOWN1Service part / kit PartsGeek
75257Brush Assembly4Service part / kit PartsGeek
75271Valve Overhaul Kit1Service part / kit PartsGeek
76271VALVE OVERHAUL KIT1Service part / kit PartsGeek
987731Service part / kit PartsGeek

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

Owner's manual — 98772 (Generac)Owner's manual — 98772 (Generac)

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