HomeGeneracGenerac MLT4200IF4

Generac MLT4200IF4 Generator Set

The Generac MLT4200IF4 is a 20 kW (36.2 kVA) diesel standby generator set powered by a Isuzu 4LE2TAGV-03 engine. It is available at 120/240 V, single-phase, 60 Hz and rated 167 A. It holds about 10.4 L (2.7 gal) of oil and 17 L (4.5 gal) of coolant, with a maximum ambient rating of 49 °C. Starting uses 1 battery rated 720 CCA at 12 V. The set measures 2921×1727×2718 mm (115.0×68.0×107.0 in), weighs about 1033 kg (2277 lb) and produces 68 dBA at 7 m. An integrated tank holds 194.5 L (51.4 gal), roughly 48 hours of runtime. The same 4LE2TAGV-03 engine also powers generator sets from Isuzu, John Deere and Magnum.

20 kW
Standby
2.18 L
Displacement
10.4 L
Oil capacity
2
Document types

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Typical fuel consumption for 20–25 kW Diesel generators →

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Service parts for the MLT4200IF4

Grouped by system, with how many of each the parts manual calls for.

Fuel system

1 required

Oil system

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

Fueldiesel
Frequency60.0 Hz
Standby power20 kW
Prime power20 kW
Emissions4
ControllerEngraved aluminum punched
Oil capacity10.4 L
AlternatorMarathon 334CSA3028
Voltage options120/240 V
PhaseSingle
Rated current167 A
Circuit breaker100 A
Battery cranking720 CCA
Battery voltage12 V
Battery quantity1
Max ambient49 °C
Dimensions (L×W×H)2921×1727×2718 mm
Dry weight1033 kg
Wet weight1176 kg
Sound level68.0 dBA @ 7 m
Fuel tank194.5 L
Tank runtime48 hr

Engine

Isuzu 4LE2TAGV-03
Oil capacity10.4 L
Coolant capacity17.0 L
Displacement2.18 L
AspirationLiquid cooled
Rated speed1800 rpm

Maintenance & consumables

for the Isuzu 4LE2TAGV-03
ItemSpecCapacityPart #Interval
Air filterDry type cartridge air filter250 hr
Fuel filterFuel filter with replaceable element69858500 hr Amazon $21.83 eBay $21.83 FridayParts $36.28
Oil filterFull flow oil filter, spin on type6705703041000 hr Amazon eBay $16.89 PartsGeek $7.98 FridayParts $20.19
BatteryClean Battery1000 hr
BeltCheck Fan Belt Tension (Replace If Necessary)1000 hr
CoolantCheck Coolant Level250 hr
OilCheck Oil Level250 hr
Spark plugReplace Air Filter Element1000 hr

Compatible filters for the Isuzu 4LE2TAGV-03 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: Generac OE3557 Generac OE3656 Isuzu 8972319000 Isuzu 5864014350 Isuzu 8972599390

Common questions

What is the power rating of the Generac MLT4200IF4?

The Generac MLT4200IF4 is rated 20 kW standby.

What engine does the Generac MLT4200IF4 use?

The Generac MLT4200IF4 is powered by the Isuzu 4LE2TAGV-03 engine.

What fuel does the Generac MLT4200IF4 use?

The Generac MLT4200IF4 runs on diesel.

What is the oil capacity of the Generac MLT4200IF4?

The Isuzu 4LE2TAGV-03 engine in the Generac MLT4200IF4 has an oil capacity of 10.4 liters.

Which alternator is fitted to the Generac MLT4200IF4?

The Generac MLT4200IF4 uses a Marathon 334CSA3028 alternator.

What oil filter does the Generac MLT4200IF4 use?

The Generac MLT4200IF4 uses oil filter part number 670570304.

What fuel filter does the Generac MLT4200IF4 use?

The Generac MLT4200IF4 uses fuel filter part number 69858.

What air filter fits the Generac MLT4200IF4?

The Generac MLT4200IF4 uses air filter part numbers GENERAC OE3557, GENERAC OE3656.

Troubleshooting

6

Fault codes

CodeMeaning
Check Engine FaultA fault not recognized by the controller has been detected.
Low Oil PressureEngine oil pressure has fallen below its configured low oil pressure alarm level.
UnderspeedEngine speed has fallen below its configured underspeed alarm level.
OverspeedEngine speed has risen above its configured overspeed alarm level.
Low Fuel LevelEngine’s fuel level has fallen below its configured low fuel level alarm.
Battery Under/Over VoltageEngine’s DC supply has fallen below or risen above its configured alarm level.

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

Parts

4
Part #DescriptionQtySystem
01035Central Lift PointCentral lift point Amazon eBay
01144ControllerController Amazon eBay
90243Air Filter ElementAir filter Amazon eBay
209649Form: SFC626B1Service part / kit 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
Continuous3.971.05
Continuous100%7.82.1
Prime5%3.971.05
Prime100%7.82.1

Available documents

Spec sheet (Generac)Owner's manual — 37096 (Generac)
Full service, cheapest listings

Priced items from this model's own parts manual.

Fuel filter 69858$21.83
Oil filter 670570304$7.98
2 priced items$29.81