HomeGeneracGenerac MLT4250

Generac MLT4250 Generator Set

The Generac MLT4250 is a 25 kW (34.5 kVA) standby generator set powered by a Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E engine. It operates at 60 Hz. It holds about 8.6 L (2.3 gal) of oil and 11.6 L (3.1 gal) of coolant.

25 kW
Standby
2.2 L
Displacement
8.6 L
Oil capacity
1
Document types

How to read your Generac serial & model number →

Specifications

Frequency60.0 Hz
Standby power25 kW
Standby kVA34
Prime power23 kW
Oil capacity8.6 L

Engine

Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E
Oil capacity8.6 L
Coolant capacity11.6 L
Displacement2.2 L
Aspirationliquid cooled, 4-stroke
Rated speed1800 rpm

Maintenance & consumables

for the Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E
ItemSpecCapacityPart #Interval
Air filter250 hr find
Fuel filter8944015310250 hr PartsGeek
Oil filter670570304250 hr PartsGeek FridayParts $20.19
Belt250 hr find
Coolant250 hr
Oil250 hr

Compatible filters for the Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: Generac OE3557 Generac OE3656 Isuzu 5864014350 Isuzu 8972599390 Donaldson P775687

Common questions

What is the power rating of the Generac MLT4250?

The Generac MLT4250 is rated 25 kW standby (34.5 kVA).

What engine does the Generac MLT4250 use?

The Generac MLT4250 is powered by the Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E engine.

What is the oil capacity of the Generac MLT4250?

The Isuzu 4LE1NYGV-03 / 4LE1NYGV-03E engine in the Generac MLT4250 has an oil capacity of 8.6 liters.

Parts

15
Part #DescriptionQtySystem
002806Phase rotation must be compatibleTransfer switch PartsGeek
004527Optional Lower Radiator Hose Heater Use and Maintenance ManualHose PartsGeek
004542Control Power switchSwitch PartsGeek
004544Main Circuit BreakerKnob PartsGeek
004664Wiring and connections to unitWiring PartsGeek
004526Service part / kit PartsGeek
004528Service part / kit PartsGeek
004551Equipment Damage. Failure to perform a daily inspection could result in damage to the unit.Service part / kit PartsGeek
004647Unit ID TagService part / kit PartsGeek
004650Form: SFC626BService part / kit PartsGeek
004678Main Control PanelService part / kit PartsGeek
004680Service part / kit PartsGeek
004681Service part / kit PartsGeek
MIT4150240 VAC 50 Amp Twistlock Outlets2Service part / kit PartsGeek
MIT4200240 VAC 30 Amp Twistlock Outlets2Service 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
Standby

Available documents

Owner's manual — 13134 (Generac)