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Generac GT-990 Generator Set

The Generac GT-990 is a 10 kW Natural Gas (NG) / Liquid Propane (LP) standby generator set powered by a Generac V-twin GT-990 engine. It is available at 120 V, 3-phase, 60 Hz and rated 65.7 A. It holds about 1.7 L (0.4 gal) of oil. The set measures 1200×850×960 mm (47.2×33.5×37.8 in) and weighs about 437.5 kg (965 lb). An integrated tank holds 128 L (33.8 gal), roughly 9.6 hours of runtime.

10 kW
Standby
1.7 L
Oil capacity
3
Document types

Specifications

FuelNatural Gas (NG) / Liquid Propane (LP)
Frequency60.0 Hz
Standby power10 kW
Oil capacity1.7 L
Voltage options120 V
Phase3-phase
Rated current65.7 A
Power factor0.8
Dimensions (L×W×H)1200×850×960 mm
Dry weight437 kg
Fuel tank128.0 L
Tank runtime9.6 hr

Maintenance & consumables

for the Generac V-twin GT-990
ItemSpecCapacityPart #Interval
Air filter0C8127 NAPA $24.03 Amazon eBay $28.00
Air filter924-03691000 hr eBay
Air filterChange the engine air cleaner.C8127150 hr NAPA $24.03 Amazon eBay $17.95
Belt924-03651000 hr eBay
CoolantGenerac OE924-03701000 hr eBay
Fuel filterGenerac OE924-037150 hr eBay
Oil filter70185 NAPA $9.09 Amazon eBay $10.49
Oil filter924-03681000 hr eBay
BeltInspect belts for wear or damage, replace if necessary.150 hr find
CoolantCheck and add coolant as needed.360 hr
Fuel filterChange the fuel filter.360 hr find
OilChange the engine oil.4.31 L150 hr
Oil filterChange the oil filter.150 hr find

Parts

11
Part #DescriptionQtySystem
924-0365Belt, Generac OE1Belt eBay
924-0368Oil Filter, Generac OE1Oil filter eBay
924-0369Air Filter, Generac OE1Air filter eBay
924-0370Coolant, Generac OE1Coolant filter eBay
924-0371Fuel Filter, Generac OE1Fuel filter eBay
924-0380Battery, 12V, 75Ah1Battery eBay
0C2969ASSEMBLY, CONNECTING ROD (GT-990)2Service part / kit buy
0C8526CARBURETOR (GT-990)1Service part / kit buy
0D4040EASSEMBLY, CRANKSHAFT HORIZONTAL DIRECT DRIVE (GT-990)1Service part / kit buy
72486-00012 Volt DC Outlet1Service part / kit buy
72532-000120 Volt AC Outlet1Service 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

BrochureOwner's manualService manual