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Generac MDG100DF4 Generator Set

The Generac MDG100DF4 is a 85 kW (106.25 kVA) Diesel standby generator set powered by a John Deere 4045HFG04A engine. It is available at 277/480 V and 120/240 V, 1-phase and 60 Hz. It holds about 15 L (4.0 gal) of oil and 20.8 L (5.5 gal) of coolant, with a maximum ambient rating of 113 °C. Starting uses 1 battery rated 750 CCA at 12 V. The set weighs about 4940 kg (10891 lb).

85 kW
Standby
4.5 L
Displacement
15.0 L
Oil capacity
3
Document types

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power85 kW
Standby kVA106
Prime power77 kW
EmissionsFinal Tier 4
ControllerPower Zone® Controller And Display
Oil capacity15.0 L
AlternatorMarathon 362CSL1606 (4-pole, Class H insulation)
Voltage options277/480 V, 120/240 V
Phase1-phase,3-phase
Power factor[1.0, 0.8]
Battery cranking750 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity20.8 L
Max ambient113 °C
Dry weight4940 kg

Engine

John Deere 4045HFG04A
Oil capacity15.0 L
Displacement4.5 L
AspirationTurbo/air-to-air, after-cooled
Rated speed1800 rpm

Maintenance & consumables

for the John Deere 4045HFG04A
ItemSpecCapacityPart #Interval
Air filter— find
Fuel filterfuel filter is verified to have correct levels, per the engine manufacturer’s manual— find
Oil filter— find
Beltengine fan belt tension and condition are within spec, engine fan belt guard is installed and secure— find
Coolantcoolant level should be correct per the engine manufacturer’s manual—
Oilengine oil level should be correct per the engine manufacturer’s manual—

Compatible filters for the John Deere 4045HFG04A — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: John Deere AL204809 John Deere AT390262 John Deere AT390261 John Deere AL119839 John Deere AL150285
  • Fuel filter: John Deere AE20952 John Deere AT274723 John Deere RE62418 John Deere RE62419 John Deere RE509208
  • Oil filter: John Deere RE519987 John Deere MIU800650 John Deere DZ118286 Donaldson P550779 Donaldson P502051

Common questions

What is the power rating of the Generac MDG100DF4?

The Generac MDG100DF4 is rated 85 kW standby (106.25 kVA).

What engine does the Generac MDG100DF4 use?

The Generac MDG100DF4 is powered by the John Deere 4045HFG04A engine.

What fuel does the Generac MDG100DF4 use?

The Generac MDG100DF4 runs on Diesel.

What is the oil capacity of the Generac MDG100DF4?

The John Deere 4045HFG04A engine in the Generac MDG100DF4 has an oil capacity of 15.0 liters.

What alternator does the Generac MDG100DF4 use?

The Generac MDG100DF4 uses a Marathon 362CSL1606 alternator. It has 4 poles. Insulation class H.

What oil filter does the Generac MDG100DF4 use?

The Generac MDG100DF4 uses oil filter part numbers JOHN DEERE RE519987, JOHN DEERE MIU800650.

What fuel filter does the Generac MDG100DF4 use?

The Generac MDG100DF4 uses fuel filter part numbers JOHN DEERE AE20952, JOHN DEERE AT274723.

What air filter does the Generac MDG100DF4 use?

The Generac MDG100DF4 uses air filter part numbers JOHN DEERE AL204809, JOHN DEERE AT390262.

Troubleshooting

4

Symptoms & remedies

SymptomRemedy
Low Load indicator LED illuminates when genset has operated at less than 30% capacity for more than 15 minutes.Resolve by increasing electrical load. If unable to operate genset at more than 30% load, use a smaller generator.
Lug Door Open indicator LED illuminates when lug-box door is open.Resolve by closing lug-box door. If condition remains unresolved, inspect lug-box door safety switch for proper operation.
Emergency Stop indicator LED illuminates when Emergency Stop switch is active (pushed in).Resolve by deactivating (pulling out) Emergency Stop switch.
Shutdown indicator LED illuminates when a shutdown alarm is present.Resolve by resolving shutdown condition.

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

Parts

68
Part #DescriptionQtySystem
002858aCAPLow idle switch PartsGeek
010417Oil and filter1Oil PartsGeek
010418Fuel filter1Fuel filter PartsGeek
010419Air filter1Air filter PartsGeek
010420Coolant and filter1Coolant PartsGeek FridayParts $151.60
010421Belt1Belt PartsGeek
010422Battery service1Battery service PartsGeek
010423Spark plugs1Spark plug PartsGeek
010424(F) Engine Start ButtonAuto mode led PartsGeek
010425(G) Alarm Mute and Lamp Test ButtonAlarm mute and lamp test button PartsGeek
010426(H) AUTO Mode LEDAuto mode led PartsGeek
010427(I) AUTO Mode ButtonAuto mode button PartsGeek
010428(J) PAS valve test switch LED (if equipped)Manual mode button PartsGeek
010429(K) PAS valve test switch (if equipped)Engine stop reset mode button PartsGeek
010430(L) Maintenance AlarmsEngine stop reset mode led PartsGeek
010431Open generator buttonOpen generator button PartsGeek
010432Open generator LEDOpen generator led PartsGeek
002806Phase rotation must be compatibleService part / kit PartsGeek
002859aCAPService part / kit PartsGeek
0062261Service part / kit PartsGeek
10000024262Decal, phase switch warning1Service part / kit PartsGeek
10000024936Right rear corner assembly1Service part / kit PartsGeek
10000024948Front hood assembly1Service part / kit PartsGeek
10000024956Rear panel assembly1Service part / kit PartsGeek
10000024971Foam, duct - side1Service part / kit PartsGeek
10000024975Left rear corner assembly1Service part / kit PartsGeek
10000024976Left rear door assembly1Service part / kit PartsGeek
10000024981Foam, front flip hood - right front side1Service part / kit PartsGeek
10000025269Foam, front flip hood, ceramic - top1Service part / kit PartsGeek
10000028027Foam, front flip hood - right rear side1Service part / kit PartsGeek
10000029864Decal set, MDG75 mechanical group1Service part / kit PartsGeek
10000030557Assembly, door, left rear2Service part / kit PartsGeek
10000030564End panel assembly2Service part / kit PartsGeek
12142DECAL, GROUND1Service part / kit PartsGeek
18460Hinge, left (female)2Service part / kit PartsGeek
20677WDuct, rear air1Service part / kit PartsGeek
20795SRVFoam, corner common1Service part / kit PartsGeek
20798SRVFoam, duct - face1Service part / kit PartsGeek
26288Handle, front hood access1Service part / kit PartsGeek
26386Decal, Pinch Point1Service part / kit PartsGeek
30645Panel, emergency stop1Service part / kit PartsGeek
32107WPanel, left rear1Service part / kit PartsGeek
32124WPanel, side3Service part / kit PartsGeek
32125SRVRoof assembly1Service part / kit PartsGeek
32302SRVFoam, front flip hood - top1Service part / kit PartsGeek
32309SRVFoam, front flip hood - front1Service part / kit PartsGeek
32535WPanel, front right inside hood1Service part / kit PartsGeek
32706WPanel, front hood1Service part / kit PartsGeek
32707WPanel, front hood - top1Service part / kit PartsGeek
32723BPanel, exhaust grate1Service part / kit PartsGeek
32822SRVFoam, front flip hood - front top1Service part / kit PartsGeek
32823SRVFoam, front flip hood - front bottom1Service part / kit PartsGeek
33312WDoor, control1Service part / kit PartsGeek
33313SRVControl door assembly1Service part / kit PartsGeek
33642Window, control door - UV1Service part / kit PartsGeek
393531Side panel assembly3Service part / kit PartsGeek
50876Decal, positive battery disconnect1Service part / kit PartsGeek
51552Decal, high temp1Service part / kit PartsGeek
60095Nut, .312-18 sflg2Service part / kit PartsGeek
60268Rivet, .188 dia x .126 to .250 grip, SS4Service part / kit PartsGeek
60303Nut, .312-18 nylock, G24Service part / kit PartsGeek
60340Washer, .312 flat .875/.040, SS12Service part / kit PartsGeek
60452Washer, .313 flat 1.125/1.0 bonded rubber, SS1Service part / kit PartsGeek
60505Nut, .312-18 U-clip - long type17Service part / kit PartsGeek
60507Screw, .312-18x1.0 std hex, SS8Service part / kit PartsGeek
61066Screw, .312-18 x 1.0 carr sqr, SS4Service part / kit PartsGeek
62086Nut, .312-18 U-clip - short type2Service part / kit PartsGeek
A0001578044Assembly, control box2Service 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
Prime6.37
Standby6.37

Available documents

Spec sheet — Generac MDG100DF4-SPEC- 01.2019 (Generac)Owner's manual — A0000393907 (Generac)Parts manual — A0000393909 (Generac)