Service parts for the MMG25IF4
Grouped by system, with how many of each the parts manual calls for.
Fuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Frequency | 60.0 Hz |
|---|---|
| Standby power | 26 kW |
| Standby kVA | 36 |
| Prime power | 23 kW |
| Emissions | 4f |
| Controller | Power Zone |
| Oil capacity | 10.4 L (11.0 US qt) |
| Alternator | Marathon 283PSL1707,285PSL1700 |
Engine
| Oil capacity | 10.4 L (11.0 US qt) |
|---|---|
| Coolant capacity | 17.0 L |
| Displacement | 2.18 L |
| Aspiration | Liquid cooled |
| Rated speed | 1800 rpm |
Same engine, other brands
3 brandsThe Isuzu 4LE2TAGV-03 in this set also powers 6 generator sets sold under 3 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| Generac | MDG20IF4-MLG20IF4, MLG20IF4, MLT4200IF4, MMG25IF4 |
| Isuzu | 4LE2TAGV-03 |
| John Deere | MLG20IF4 |
Maintenance & consumables
for the Isuzu 4LE2TAGV-03| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Dry type cartridge air filter | — | 250 hr | ||
| Fuel filter | Fuel filter with replaceable element | 69858 | 500 hr | Amazon eBay $21.83 NAPA $15.34 FridayParts $36.28 | |
| Oil filter | 670570304 | 1000 hr | Amazon eBay $16.89 PartsGeek $7.98 NAPA $9.09 FridayParts $20.19 | ||
| Battery | Clean Battery | — | 1000 hr | ||
| Belt | Check Fan Belt Tension (Replace If Necessary) | — | 1000 hr | ||
| Coolant | Check Coolant Level | — | 250 hr | ||
| Oil | Check Oil Level | 10.4 L (11.0 US qt) | — | 250 hr | |
| Spark plug | Replace Air Filter Element | — | 1000 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 Magnum MMG25IF4?
The Magnum MMG25IF4 is rated 26 kW standby (36.0 kVA).
Which engine powers the Magnum MMG25IF4?
The Magnum MMG25IF4 is powered by the Isuzu 4LE2TAGV-03 engine.
What is the oil capacity of the Magnum MMG25IF4?
The Magnum MMG25IF4 takes 10.4 L (11.0 US qt) of engine oil (Isuzu 4LE2TAGV-03 engine specification).
How much coolant does the Magnum MMG25IF4 hold?
The Magnum MMG25IF4 cooling system holds 17 liters (4.5 US gallons) for the engine, per the manufacturer specification sheet.
What is the continuous rating of the Magnum MMG25IF4?
The Magnum MMG25IF4 is rated 23 kW prime (29 kVA), against 26 kW standby.
Which alternator is fitted to the Magnum MMG25IF4?
The Magnum MMG25IF4 uses a Marathon 283PSL1707,285PSL1700 alternator.
What oil filter fits the Magnum MMG25IF4?
The Magnum MMG25IF4 uses oil filter part number 670570304. Equivalents: NAPA 1334, CATERPILLAR 3I1603, AC DELCO 88905888.
What fuel filter does the Magnum MMG25IF4 use?
The Magnum MMG25IF4 uses fuel filter part number 69858.
What air filter fits the Magnum MMG25IF4?
The Magnum MMG25IF4 uses air filter part numbers GENERAC OE3557, GENERAC OE3656.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low fuel level shutdown | Fuel level low; fuel tank leak; fuel level sender or connecting wiring damaged | Check the fuel level on the LCD window and confirm the unit is sitting level; check for leaks in the fuel tank; check the fuel level sender and the connecting wiring for damage and check for continuity between the sender and the engine controller |
| Low oil pressure shutdown | Low engine oil level; oil leaks; oil pressure sender fault | Check the level of the engine oil with the dipstick and add oil if required; visually inspect the engine for oil leaks; restart the unit and verify the loss of oil pressure, shutting the engine down immediately if the oil pressure value does not read 5 psi (34 kPa) within five seconds; check the oil pressure sender and refer to the troubleshooting section of the engine operator's manual |
| Low coolant level shutdown | Low coolant level; coolant leaks; coolant mixed with engine oil | Allow the engine to cool; check the coolant level in the radiator and add coolant until it is 3/4 in. (1.9 cm) below the filler neck; inspect coolant hoses, engine block and water pump for visible leaks; check engine oil to verify no coolant has mixed with it |
| High coolant temperature shutdown | Low coolant level; radiator shroud and ducting blockage; coolant leaks; loose serpentine drive belt; engine overheating | Check the coolant level in the overflow jug; restart the engine and read the coolant temperature, stopping the engine immediately if the coolant temperature is 210°F (99°C) or more; allow the engine to cool, add coolant to the overflow jug if low and check the radiator level, adding coolant until it is 3/4 in. (1.9 cm) below the filler neck; check the radiator shroud and ducting for blockage and remove any foreign matter; inspect coolant hoses, engine block and water pump for visible leaks; check the tension of the serpentine drive belt for the water pump; remove the load on the generator and restart the engine, checking the coolant temperature and shutting the engine down immediately if it starts to overheat |
| Overcrank shutdown | Low fuel level; fuel pump not operating properly; air filter blockage; starting problem | Check the fuel level in the tank; check for proper operation of the fuel pump; check the air filter for blockage; refer to the engine operator's manual for additional information on troubleshooting starting problems |
| Overspeed or underspeed shutdown | Disconnect all loads and restart the generator; read the frequency (Hz) on the LCD window (with no loads the frequency should read 60.0 Hz) |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 01035 | Central Lift Point | Central lift point | Amazon eBay | |
| 01144 | Controller | Controller | Amazon eBay | |
| 90243 | Air Filter Element | Air filter | Amazon eBay | |
| 209649 | Form: SFC626B | 1 | Service 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
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 47.32 | 12.5 |
Source — consumption: 48972.