Specifications
| Standby power | 20 kW |
|---|---|
| Standby kVA | 20 |
| Prime power | 19 kW |
| Alternator | Marathon 334CSA3028 |
| Voltage options | 120 V, 240 V |
Maintenance & consumables
for the Isuzu 4LE2TAGV-03| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 250 hr | find | ||
| Fuel filter | Fuel filter with replaceable element | 69858 | 500 hr | Amazon eBay $42.74 PartsGeek | |
| Oil filter | Full flow oil filter, spin on type | 670570304 | 1000 hr | PartsGeek FridayParts $20.19 | |
| Belt | — | 1000 hr | find | ||
| Coolant | — | 250 hr | |||
| Oil | — | 250 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 MDG20IF4-MLG20IF4?
The Generac MDG20IF4-MLG20IF4 is rated 20 kW standby (20.0 kVA).
What engine does the Generac MDG20IF4-MLG20IF4 use?
The Generac MDG20IF4-MLG20IF4 is powered by the Isuzu 4LE2TAGV-03 engine.
What alternator does the Generac MDG20IF4-MLG20IF4 use?
The Generac MDG20IF4-MLG20IF4 uses a Marathon 334CSA3028 alternator.
Troubleshooting
2Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low Oil Pressure Shut-down | Low oil level, Oil leaking from engine, Oil pressure sender | Check oil level on dipstick. Add oil, if needed. 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. Refer to engine operator’s manual to identify corrective action. |
| High Coolant Temperature Shutdown | Low coolant level, Blockage in radiator, Leakage in coolant hoses, engine block, or water pump | 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. Check radiator shroud and ducting for blockage and remove any foreign matter. 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
32| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 002306 | Grease for trailer wheel bearings | Fluid | PartsGeek | |
| 002327 | Remote Start Terminal Block | Remote start terminal block | PartsGeek | |
| 00243 | Grease | Oil | PartsGeek | |
| 002807 | WHITE Incoming utility power GRAY Normal utility power circuit BLACK Emergency generator power circuit | Transfer switch | PartsGeek | |
| 003784 | Lubricant for winch maintenance | Fluid | PartsGeek | |
| 003984 | Remote Start Terminal Block | Remote start terminal block | PartsGeek | |
| 006983 | Transfer Switch | Transfer switch | PartsGeek | |
| 00852 | Home and generator voltage and frequency operator screens | Operator screen | PartsGeek | |
| 90243 | Grease | Grease | PartsGeek | |
| 00131 | PROPER MAST CABLE ROUTING | Service part / kit | PartsGeek | |
| 00194 | Breakers Located Behind The Panel | Service part / kit | PartsGeek | |
| 00204 | Use Lower Forklift Pockets To Lift Do NOT Use To Lift | Service part / kit | PartsGeek | |
| 00206 | Transfer Switch Diagram | Service part / kit | PartsGeek | |
| 00229 | Water Supply and Mast Lowering Instructions | Service part / kit | PartsGeek | |
| 002329 | Scheduler Screen | Service part / kit | PartsGeek | |
| 002354 | Operator Screens | Service part / kit | PartsGeek | |
| 002355 | Spark Arrester | Service part / kit | PartsGeek | |
| 002544 | Home Screen | Service part / kit | PartsGeek | |
| 003779 | Maintenance Screen | Service part / kit | PartsGeek | |
| 003780 | Event Log Screen | Service part / kit | PartsGeek | |
| 003781 | Faults | Service part / kit | PartsGeek | |
| 003782 | Underspeed | Service part / kit | PartsGeek | |
| 003975 | Service part / kit | PartsGeek | ||
| 003980 | High Voltage. Verify area above unit is clear of overhead wires and obstructions. Contact with high-voltage power lines will result in death or serious injury. | Service part / kit | PartsGeek | |
| 003981 | WARNING Consult Manual. Read and understand manual completely before using product. Failure to completely understand manual and product could result in death or serious injury. | Service part / kit | PartsGeek | |
| 004551 | Do Not Start sign | Service part / kit | PartsGeek | |
| 00851 | Stop/Reset Mode LED | Service part / kit | PartsGeek | |
| 00886 | Remote Start Switch Terminals | Service part / kit | PartsGeek | |
| 00899 | Turn Lights On or Off Individually | Service part / kit | PartsGeek | |
| 00900 | MTT20IF4 | 1 | Service part / kit | PartsGeek |
| 00908 | Use Lower Forklift Pockets To Lift Do NOT Use To Lift | Service part / kit | PartsGeek | |
| 209649 | Form: SFC626B | Service 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
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 100% | 7.8 | 2.1 |
| Standby |
Available documents
Operator's manual — 37100 (Generac)