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Generac MMG100D Generator Set

The Generac MMG100D is a 110 kW (133 kVA) standby generator set powered by a John Deere PE4045HFG92 engine. It is available at 120 V, 139 V, 208 V, 220 V, 240 V and 277 V, 3Ø, 60 Hz and rated 305 A. It holds about 15.5 L (4.1 gal) of oil and 4.5 L (1.2 gal) of coolant. Starting uses 1 group-24 battery rated 720 CCA at 12 V. The set measures 3920×1020×1570 mm (154.3×40.2×61.8 in), weighs about 1782 kg (3929 lb) and produces 68 dBA at 23 m. An integrated tank holds 625 L (165.1 gal), roughly 24 hours of runtime. The same PE4045HFG92 engine also powers generator sets from Magnum.

110 kW
Standby
4.5 L
Displacement
15.5 L
Oil capacity
3
Document types

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Specifications

Frequency60.0 Hz
Standby power110 kW
Standby kVA133
Prime power100 kW
Emissions4i
Oil capacity15.5 L
AlternatorMarathon 362PSL1606
Voltage options120 V, 139 V, 208 V, 220 V, 240 V, 277 V
Phase3Ø
Rated current305 A
Power factor1 (1Ø), 0.8 (3Ø)
Circuit breaker400 A
Battery group24
Battery cranking720 CCA
Battery voltage12 V
Battery quantity1
Dimensions (L×W×H)3920×1020×1570 mm
Dry weight1782 kg
Sound level68.0 dBA @ 23 m
Fuel tank625.0 L
Tank runtime24 hr

Engine

John Deere PE4045HFG92
Oil capacity14.7 L
Coolant capacity4.5 L
Displacement4.5 L
Aspirationturbocharged
Rated speed1800 rpm

Same engine, other brands

1 brand

The John Deere PE4045HFG92 in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

BrandModels
MagnumMMG75

Maintenance & consumables

for the John Deere PE4045HFG92
ItemSpecCapacityPart #Interval
Air filter—3000 hr
Fuel filter—1000 hr
Oil filter—500 hr
Battery—6000 hr
Belt—18000 hr
Coolant20.8—18000 hr
Coolant filter—
Oil15.5—1000 hr
Spark plug—1000 hr

Common questions

What size generator is the Generac MMG100D?

The Generac MMG100D is rated 110 kW standby (133.0 kVA).

What engine does the Generac MMG100D use?

The Generac MMG100D is powered by the John Deere PE4045HFG92 engine.

What's the oil capacity on a Generac MMG100D?

The John Deere PE4045HFG92 engine in the Generac MMG100D has an oil capacity of 14.7 liters.

How much coolant does the Generac MMG100D hold?

The Generac MMG100D cooling system holds 4.5 liters (1.2 US gallons) for the engine, per the manufacturer specification sheet.

What is the prime power rating of the Generac MMG100D?

The Generac MMG100D is rated 100 kW prime (121 kVA), against 110 kW standby.

What is the sound level of the Generac MMG100D?

The Generac MMG100D is rated at 68.0 dBA at 23 m, per the manufacturer specification sheet.

How much does the Generac MMG100D weigh?

The Generac MMG100D has a dry weight of 1782 kg (3928 lb).

How big is the fuel tank on the Generac MMG100D?

The Generac MMG100D has a 625 liter (165 US gallon) fuel tank, giving about 24 hours of runtime.

What voltage does the Generac MMG100D produce?

The Generac MMG100D is offered in 120 V, 139 V, 208 V, 220 V, 240 V, 277 V, 3Ø-phase.

How many cold cranking amps does the Generac MMG100D require?

The Generac MMG100D uses 1 battery, 12 V each, 720 CCA, group 24, per the manufacturer specification sheet.

What alternator comes on the Generac MMG100D?

The Generac MMG100D uses a Marathon 362PSL1606 alternator.

Troubleshooting

3

Symptoms & remedies

SymptomCauseRemedy
Low Fuel LevelShutdown, Low fuel level, Unit not level, Fuel tank leaking, Damaged fuel sender or wiringCheck fuel level in LCD window of controller. Confirm that unit is sitting level to ensure an accurate reading. Check tank for leaks. Check for continuity between sender and engine controller.
Low Oil PressureShutdown, Low oil level, Oil leaking from engine, Oil pressure senderCheck oil level on dipstick. Add oil, if needed. Visually inspect the engine for leaks. Restart unit and verify loss of pressure. Shut down immediately if pressure does not reach 5 psi (34 kPa) within five seconds. See engine operator’s manual to identify corrective action.
Low Coolant LevelShutdown, Low coolant level, Coolant hoses leaking, Engine block or water pump leakingAllow engine to cool, then check coolant level in radiator. Add coolant, if needed.

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

Parts

11
Part #DescriptionQtySystem
100-025Air Filter1Air filter Amazon eBay
100-030Oil Filter1Oil filter Amazon eBay
100-045Fuel Filter1Fuel filter Amazon eBay FridayParts $20.19
100-060Coolant Filter1Coolant filter Amazon eBay
100-085Belt2Belt Amazon eBay
100-100Spark Plug1Spark plug Amazon eBay
25-1476Air Filter Minders1Air filter Amazon eBay
25-1483Primary Air Cleaners1Air filter Amazon eBay
25-1639Fuel Filters1Fuel filter Amazon eBay
25-1648Oil Filters1Oil filter Amazon eBay
AN500T0106STARTER SWITCHStarter Amazon eBay

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
Prime100%6.41.6
Standby25%3.80.97

Available documents

Operator's manual — Generac Towable Diesel Generator - MMG75D-MMG100D Owners Manual (Generac)Owner's manual — 33701 (Generac)Parts manual — Generac Mobile Diesel Generator Brochure (Generac)

This page was generated from the 3 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

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