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Home›Generac›Generac MDG75DF4

Generac MDG75DF4 Generator Set

The Generac MDG75DF4 is a 68 kW (85 kVA) Diesel standby generator set powered by a John Deere 4045HFG04 engine. It is available at 120/240 V, 208/120 V, 240/120 V, 480/277 V and 600/346 V, 1-phase and 60 Hz. It holds about 21 L (5.5 gal) of oil and 26.1 L (6.9 gal) of coolant, with a maximum ambient rating of 401.7 °C. Starting uses 90 batteries rated 720 CCA at 12 V. The set weighs about 3830 kg (8444 lb) and produces 74 dBA at 23 m. The same 4045HFG04 engine also powers generator sets from Kohler.

68 kW
Standby
4.5 L
Displacement
21.0 L
Oil capacity
3
Document types

How to read your Generac serial & model number →

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power68 kW
Standby kVA85
Prime power60 kW
EmissionsTier 4 Final
ControllerElectronics 7310 MKII
Oil capacity21.0 L
AlternatorMarathon 361PSL1647,362PSL1650,361PSL36113
Voltage options120/240 V, 208/120 V, 240/120 V, 480/277 V, 600/346 V
Phase1-phase,3-phase
Power factor[1.0, 0.8]
Battery cranking720 CCA
Battery voltage12 V
Battery quantity90
Max ambient401.7 °C
Dry weight3830 kg
Sound level74.0 dBA @ 23 m
Tank runtime26.5 hr

Engine

John Deere 4045HFG04
Oil capacity21.0 L
Coolant capacity26.1 L
Displacement4.5 L
AspirationTurbocharged Charge Air Cooled
Rated speed1800 rpm

Maintenance & consumables

for the John Deere 4045HFG04
ItemSpecCapacityPart #Interval
Fuel filterPrimary— find
Oil filterCartridge×1— find

Compatible filters for the John Deere 4045HFG04 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Fuel filter (primary): Kohler GM50006 Kohler 336661 Kohler GM48727 Kohler GM50074 John Deere AT274723
  • Oil filter: Kohler GM32809 Kohler 360031 John Deere RE519987 John Deere MIU800650 John Deere DZ118286

Common questions

What is the power rating of the Generac MDG75DF4?

The Generac MDG75DF4 is rated 68 kW standby (85.0 kVA).

What engine does the Generac MDG75DF4 use?

The Generac MDG75DF4 is powered by the John Deere 4045HFG04 engine.

What fuel does the Generac MDG75DF4 use?

The Generac MDG75DF4 runs on Diesel.

What is the oil capacity of the Generac MDG75DF4?

The John Deere 4045HFG04 engine in the Generac MDG75DF4 has an oil capacity of 21.0 liters.

What alternator does the Generac MDG75DF4 use?

The Generac MDG75DF4 uses a Marathon 361PSL1647,362PSL1650,361PSL36113 alternator.

What oil filter does the Generac MDG75DF4 use?

The Generac MDG75DF4 uses oil filter part numbers KOHLER GM32809, KOHLER 360031.

What fuel filter does the Generac MDG75DF4 use?

The Generac MDG75DF4 uses fuel filter part numbers KOHLER GM50006, KOHLER 336661.

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

51
Part #DescriptionQtySystem
GM100703Element, Primary1Air filter Amazon eBay PartsGeek
GM100704Element, Safety1Air filter Amazon eBay PartsGeek
GM62396Hose, Reducer1Hose PartsGeek
GM94203Heavy Duty Air Cleaner1Air filter Amazon eBay PartsGeek
0062261Service part / kit PartsGeek
10000015220Panel, rear1Service part / kit PartsGeek
10000015222Duct, rear1Service 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
10000024974Foam, rear duct - right1Service part / kit PartsGeek
10000024975Left rear corner assembly1Service part / kit PartsGeek
10000024976Left rear door assembly1Service part / kit PartsGeek
10000024982Foam, control door1Service part / kit PartsGeek
10000024983Foam, rear duct1Service part / kit PartsGeek
10000024994Foam, rear duct - left1Service part / kit PartsGeek
10000025002Foam, rear panel1Service part / kit PartsGeek
10000027288Door, control - paralleling option1Service part / kit PartsGeek
10000029864Decal set, MDG75 mechanical group1Service part / kit PartsGeek
10000030536Foam, control door - paralleling option1Service part / kit PartsGeek
10000030555Right rear corner assembly - paralleling1Service part / kit PartsGeek
10000030564End panel assembly2Service part / kit PartsGeek
10000030582Control door assembly - paralleling1Service part / kit PartsGeek
12142DECAL, GROUND1Service part / kit PartsGeek
20677WDuct, rear air1Service part / kit PartsGeek
20795SRVFoam, corner common1Service part / kit PartsGeek
20798SRVFoam, duct - face1Service part / kit PartsGeek
20916ZBracket, prop rod1Service part / kit PartsGeek
26386Decal, Pinch Point1Service part / kit PartsGeek
30401WPanel, end2Service part / kit PartsGeek
30402SRVFoam, end panel2Service 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
32286SRVFoam, side panel3Service part / kit PartsGeek
33313SRVControl door assembly1Service part / kit PartsGeek
33642Window, control door - UV1Service part / kit PartsGeek
34989SRVAssembly, E-stop switch1Service 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
60505Nut, .312-18 U-clip - long type17Service part / kit PartsGeek
61091Screw, .312-18 x 1.00 ser flg hd2Service part / kit PartsGeek
65470Switch, E-stop operator1Service part / kit PartsGeek
65580Block, E-stop contactor1Service part / kit PartsGeek
80REOZJ4Stationary non-emergency gen-setsService 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
Prime
Prime25%1.76.4
Prime50%2.69.8
Prime75%3.714.0
Prime100%4.918.5
Prime110%5.119.3
Standby

Available documents

Spec sheet — mdg75df4 diesel-generator spec-sheet english (Generac)Owner's manual — A0000393907 (Generac)Parts manual — 10000018653 (Generac)

Other sets with this engine

Kohler 80REOZJ4Kohler 90REOZT4