Facts About Generators
GeneratorsDirectoryEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Generac›Generac MMG50ITM

Generac MMG50ITM Generator Set

The Generac MMG50ITM is a 42 kW (53 kVA) standby generator set powered by a Isuzu 4LE2XAGV01 engine. It is available at 120 V, 139 V, 208 V, 220 V, 240 V and 277 V, 3-phase and 60 Hz. It holds about 10.4 L (2.7 gal) of oil and 17 L (4.5 gal) of coolant. Starting uses 1 group-35 battery rated 720 CCA at 12 V. The set weighs about 1475 kg (3252 lb) and produces 68 dBA at 23 m. An integrated tank holds 394 L (104.1 gal), roughly 28.5 hours of runtime.

42 kW
Standby
2.2 L
Displacement
10.4 L
Oil capacity
1
Document types

How to read your Generac serial & model number →

Specifications

Frequency60.0 Hz
Standby power42 kW
Standby kVA53
Prime power38 kW
EmissionsFinal 4
Oil capacity10.4 L
AlternatorMarathon 286PSL1701
Voltage options120 V, 139 V, 208 V, 220 V, 240 V, 277 V
Phase3Ø, 1Ø
Power factor{'1Ø': 1, '3Ø': 0.8}
Circuit breaker225 A
Battery groupGroup 35/55
Battery cranking720 CCA
Battery voltage12 V
Battery quantity1
Dry weight1475 kg
Sound level68.0 dBA @ 23 m
Fuel tank394.0 L
Tank runtime28.5 hr

Engine

Isuzu 4LE2XAGV01
Oil capacity11.4 L
Coolant capacity17.0 L
Displacement2.2 L
AspirationTurbocharged & Aftercooled
Rated speed1800 rpm

Maintenance & consumables

for the Isuzu 4LE2XAGV01
ItemSpecCapacityPart #Interval
Air filter8972319000 PartsGeek
Fuel filter8981527372 PartsGeek
Oil filterX13201002 PartsGeek
Belt— find
Coolant—
Oil—50 hr

Common questions

What is the power rating of the Generac MMG50ITM?

The Generac MMG50ITM is rated 42 kW standby (53.0 kVA).

What engine does the Generac MMG50ITM use?

The Generac MMG50ITM is powered by the Isuzu 4LE2XAGV01 engine.

What is the oil capacity of the Generac MMG50ITM?

The Isuzu 4LE2XAGV01 engine in the Generac MMG50ITM has an oil capacity of 11.4 liters.

What alternator does the Generac MMG50ITM use?

The Generac MMG50ITM uses a Marathon 286PSL1701 alternator.

Troubleshooting

1

Fault codes

CodeMeaningCauseRemedy
LOW FUEL LEVEL SHUT DOWNEngine automatically shuts down.Fuel level is low, fuel tank has leaks, or fuel level sender is damaged.Check the fuel level on the LCD window. Confirm that the generator is sitting level to ensure an accurate reading. Check for leaks in the fuel tank. If the fuel level is good and no leaks are found, check the fuel level sender and the connecting wiring for damage.

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

Parts

71
Part #DescriptionQtySystem
000864 Position Voltage Selector Switch OptionVoltage selector switch PartsGeek
00204Central Lift PointCentral lift point PartsGeek
00230Prestart ChecklistEmergency stop switch PartsGeek
00231Remote Start Switch TerminalsRemote start switch terminals PartsGeek
00489Main Circuit BreakerMain circuit breaker PartsGeek
00497LCD windowLcd window PartsGeek
00498LED’sLeds PartsGeek
00499Ready/Manual LEDReady manual led PartsGeek
00500FAULT RESETFault reset button PartsGeek FridayParts $82.89
00565Central Lift PointCentral lift point PartsGeek
00566120V GFCI ReceptaclesGfcireceptacle PartsGeek
01035Central Lift PointCentral lift point PartsGeek
010417Oil and filter1Oil PartsGeek
010418Fuel filter1Fuel filter PartsGeek
010419Air filter1Air filter PartsGeek kuduparts $147.99
010420Coolant and filter1Coolant PartsGeek FridayParts $151.60
010421Belt1Belt PartsGeek
010422Battery service1Battery service PartsGeek
010423Spark plugs1Spark plug PartsGeek
01144ControllerController PartsGeek
19351Seal, U-channel6Seal PartsGeek
35/55Battery Type - 12V (1)1Battery PartsGeek
00128Digital Controller Information Displays, Functions, and ResetService part / kit PartsGeek
00493Run HoursService part / kit PartsGeek
00496Operation KeypadService part / kit PartsGeek
00558OPERATING MANUALService part / kit PartsGeek
008083Unit ID tag (located behind breaker door beneath breakers)1Service part / kit PartsGeek
12451Cord, bungee - 6 in2Service part / kit PartsGeek
13926Tether, cable steel - 14.50 in. long For .32 ID holes1Service part / kit PartsGeek
16479Assembly, roof access panel1Service part / kit PartsGeek FridayParts $409.78
18459Hinge, right (male)1Service part / kit PartsGeek
18460Hinge, left (female)1Service part / kit PartsGeek
18461Hinge, left (male)1Service part / kit PartsGeek
18462Hinge, right (female)1Service part / kit PartsGeek
18900ZCRod, door prop1Service part / kit PartsGeek
20916ZBracket, prop rod1Service part / kit PartsGeek
209649Digital Controller1Service part / kit PartsGeek
22936BBracket, lifting eye1Service part / kit PartsGeek
29558BBracket, cable carrier - side2Service part / kit PartsGeek
29559BBracket, cable carrier - center1Service part / kit PartsGeek
29595Set, cable - 4W banded, #2 SC - 50 ft1Service part / kit PartsGeek
29597Cord, electrical - 50 ft1Service part / kit PartsGeek
29624Strap, velcro wire wrap - 10 in2Service part / kit PartsGeek
29642Group, power adapters1Service part / kit PartsGeek
29653Grommet, rubber - .563 IDx.125 thick For .813 ID hole1Service part / kit PartsGeek
33667WPanel, access1Service part / kit PartsGeek
33695BPanel, roof insert1Service part / kit PartsGeek
33892Foam, front roof access1Service part / kit PartsGeek
34678BSpacer, 4.0x1.38x.1252Service part / kit PartsGeek
34682BAssembly, roof1Service part / kit PartsGeek
50230Weatherstripping - .188x.5007.5Service part / kit PartsGeek
60011Washer, M12 split lock4Service part / kit PartsGeek
60012Washer, M12 flat4Service part / kit PartsGeek
60013Nut, M12-1.75 hex, class 104Service part / kit PartsGeek
60048Pin, roll - .125x.6251Service part / kit PartsGeek
60065Screw, M12-1.75x40 sflg hex, G10.84Service part / kit PartsGeek
60095Nut, .312-18 sflg4Service part / kit PartsGeek
60144Nut, .250-20 nylock, G54Service part / kit PartsGeek
60260Rivet, .188 dia. x .375 to .500 grip2Service part / kit PartsGeek
60452Washer, .313 flat 1.125/1.0 bonded rubber, SS27Service part / kit PartsGeek
60507Screw, .312-18x1.0 std hex, SS19Service part / kit PartsGeek
60654Screw, .312-18x1.0 button hex, SS6Service part / kit PartsGeek
60684Screw, .250-20x.875 std hex, SS4Service part / kit PartsGeek
60696Washer, .250 flat .625/.050, SS8Service part / kit PartsGeek
60716Clamp, tubing - 1.50 lt duty1Service part / kit PartsGeek
61052Screw, .312-18x1.50 std hex, SS2Service part / kit PartsGeek
61055Clip, rob hold - adhesive backed3Service part / kit PartsGeek
61066Screw, .312-18x1.0 carr sqr, SS4Service part / kit PartsGeek
63328Screw, .312-18x.500 button soc hex, SS4Service part / kit PartsGeek
63329Nut, .312-18 acorn4Service part / kit PartsGeek
66108Solargizer, 12V, 5W1Service 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.

Fuel consumption

RatingLoadL/hgal/h
Prime3.312.5
Standby63.0146.0

Available documents

Service manual — 33688 (Generac)

Other sets with this engine

Generac MMG45IF4