Service parts for the MDG20IF4-MLG20IF4
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
| Standby power | 20 kW |
|---|---|
| Standby kVA | 20 |
| Prime power | 19 kW |
| Oil capacity | 10.4 L |
| Alternator | Marathon 334CSA3028 |
| Voltage options | 120 V, 240 V |
Engine
| Oil capacity | 10.4 L |
|---|---|
| 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 4 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 |
|---|---|
| Magnum | 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 | — | 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 size generator is the Generac MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 is rated 20 kW standby (20.0 kVA).
What engine is in the Generac MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 is powered by the Isuzu 4LE2TAGV-03 engine.
What is the oil capacity of the Generac MDG20IF4-MLG20IF4?
The Isuzu 4LE2TAGV-03 engine in the Generac MDG20IF4-MLG20IF4 has an oil capacity of 10.4 liters.
What is the cooling system capacity of the Generac MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 cooling system holds 17 liters (4.5 US gallons) for the engine, per the manufacturer specification sheet.
What is the prime power rating of the Generac MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 is rated 19 kW prime (19 kVA), against 20 kW standby.
What voltages is the Generac MDG20IF4-MLG20IF4 available in?
The Generac MDG20IF4-MLG20IF4 is offered in 120 V, 240 V.
What alternator does the Generac MDG20IF4-MLG20IF4 use?
The Generac MDG20IF4-MLG20IF4 uses a Marathon 334CSA3028 alternator.
What oil filter does the Generac MDG20IF4-MLG20IF4 use?
The Generac MDG20IF4-MLG20IF4 uses oil filter part number 670570304.
What fuel filter does the Generac MDG20IF4-MLG20IF4 use?
The Generac MDG20IF4-MLG20IF4 uses fuel filter part number 69858.
What air filter fits the Generac MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 uses air filter part numbers GENERAC OE3557, GENERAC OE3656.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low Oil Pressure Shutdown | Low oil level | Check oil level on dipstick. Add oil, if needed. |
| Low Oil Pressure Shutdown | Oil leaking from engine | Visually inspect the engine for leaks. Restart unit and verify loss of pressure. Shut down immediately if pressure does not reach 5 psi (34 kPa) within five seconds. |
| Low Oil Pressure Shutdown | Oil pressure sender | Refer to engine operator's manual to identify corrective action. |
| High Coolant Temperature Shutdown | Low coolant level | Add coolant if needed. Allow engine to cool, then check coolant level in radiator. Restart engine and check coolant temperature (on controller). Stop engine immediately if coolant temperature is 210°F (99°C) or more. |
| High Coolant Temperature Shutdown | Blockage in radiator | Check radiator shroud and ducting for blockage and remove any foreign matter. |
| High Coolant Temperature Shutdown | Leakage in coolant hoses, engine block, or water pump | Inspect for visible leaks. Check tension of water pump serpentine drive belt. Remove load on generator and restart engine. Check coolant temperature and shut engine down immediately if it starts to overheat. Refer to the engine operator's manual for additional information on engine overheating. |
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 | 100% | 7.8 | 2.1 |
Available documents
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.