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Magnum MTT25 Generator Set

The Magnum MTT25 is a 20 kW (25 kVA) standby generator set powered by a Isuzu 4LE1NYGV-01 engine. It is available at 120 V, 139 V, 208 V, 220 V, 240 V and 277 V, 3-phase, 60 Hz and rated 30 A. Starting uses 1 group-24 battery rated 720 CCA at 12 V. The set measures 5300×2100×2180 mm (208.7×82.7×85.8 in) and weighs about 2368 kg (5221 lb). An integrated tank holds 931 L (245.9 gal), roughly 127 hours of runtime. The same 4LE1NYGV-01 engine also powers generator sets from Generac.

20 kW
Standby
2.2 L
Displacement
1
Document types

Specifications

Frequency60.0 Hz
Standby power20 kW
Standby kVA25
Prime power18 kW
Emissions4i
AlternatorMarathon 282NSL1505
Voltage options120 V, 139 V, 208 V, 220 V, 240 V, 277 V
Phase3
Rated current30 A
Power factor0.8
Circuit breaker90 A
Battery group24
Battery cranking720 CCA
Battery voltage12 V
Battery quantity1
Dimensions (L×W×H)5300×2100×2180 mm
Dry weight2368 kg
Fuel tank931.0 L
Tank runtime127 hr

Engine

Isuzu 4LE1NYGV-01
Displacement2.2 L
Aspirationnaturally aspirated
Rated speed1800 rpm

Maintenance & consumables

for the Isuzu 4LE1NYGV-01
ItemSpecCapacityPart #Interval
Air filter1000 hr find
Fuel filterwith replaceable element8944015310250 hr PartsGeek
Oil filterfull flow, spin on type58761000801000 hr PartsGeek
Belt1000 hr find
Coolant11.6 L250 hr
Oil6.7 L250 hr

Compatible filters for the Isuzu 4LE1NYGV-01 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: Isuzu 5864014350 Isuzu 8972599390 Donaldson P775687 Donaldson P821575 Donaldson P822858

Common questions

What is the power rating of the Magnum MTT25?

The Magnum MTT25 is rated 20 kW standby (25.0 kVA).

What engine does the Magnum MTT25 use?

The Magnum MTT25 is powered by the Isuzu 4LE1NYGV-01 engine.

What alternator does the Magnum MTT25 use?

The Magnum MTT25 uses a Marathon 282NSL1505 alternator.

Troubleshooting

4

Symptoms & remedies

SymptomRemedy
Engine exceeds normal operating temperatureAutomatic shutdown system will stop the engine
Oil pressure drops too lowAutomatic shutdown system will stop the engine
Indicator light does not come onBallast may need to be serviced; check bulb or mast wiring
Lights are not illuminated when indicator light comes on and stays litCheck bulb or the mast wiring

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

Parts

8
Part #DescriptionQtySystem
00087Engine fan belt guardBelt PartsGeek
00130Fine Voltage Adjustment Screw1Fine voltage adjustment screw PartsGeek
00174Engine exhaust system componentsSeal PartsGeek
100AEquipment Outlet Main Circuit BreakerCircuit breaker PartsGeek dieselpartscenter $2.44
12398Receptacle Panel (2x5-20R, 2xL6-30R, 2x50A)Receptacle panel PartsGeek dieselpartscenter $6.83
00305OPERATING MANUAL1Service part / kit PartsGeek
01203Combination Light Tower Generator & Water TrailerService part / kit PartsGeek
1NYGV-03GService 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
Standby6.811.8

Available documents

Service manual — 10391 (Magnum)

Other sets with this engine