Specifications
| Frequency | 60.0 Hz |
|---|---|
| Standby power | 18 kW |
| Standby kVA | 24 |
| Prime power | 15 kW |
| Oil capacity | 5.7 L |
| Alternator | Marathon 333CSA3024 (Class H insulation) |
| Voltage options | 120/240 V |
| Phase | 1 |
| Rated current | 63 A |
| Power factor | 1 |
| Battery group | 24 |
| Battery cranking | 720 CCA |
| Battery voltage | 12.0 V |
| Battery quantity | 1 |
| Dimensions (L×W×H) | 4320×1830×9140 mm |
| Dry weight | 980 kg |
| Fuel tank | 212.0 L |
| Tank runtime | 43 hr |
Maintenance & consumables
for the Isuzu S4L2-W461ML| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 1000 hr | find | ||
| Fuel filter | — | 500 hr | find | ||
| Oil filter | — | 1000 hr | find | ||
| Belt | — | 1000 hr | find | ||
| Coolant | — | 1000 hr | |||
| Oil | — | 250 hr |
Common questions
What is the power rating of the Generac MLT5150?
The Generac MLT5150 is rated 18 kW standby (24.7 kVA).
What engine does the Generac MLT5150 use?
The Generac MLT5150 is powered by the Isuzu S4L2-W461ML engine.
What is the oil capacity of the Generac MLT5150?
The Isuzu S4L2-W461ML engine in the Generac MLT5150 has an oil capacity of 5.7 liters.
What alternator does the Generac MLT5150 use?
The Generac MLT5150 uses a Marathon 333CSA3024 alternator. Insulation class H.
Troubleshooting
12Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| (000139) | Low oil pressure shutdown | Low oil level | Verify oil level on dipstick. Add oil, if needed. |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Oil leaking from engine | Visually inspect the engine for leaks. | |
| Oil pressure switch failure | Refer to OEM 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. Stop engine immediately if coolant temperature is 210°F (99°C) or more. |
| Blockage in radiator | Inspect radiator shroud and ducting for blockage and remove any foreign matter. | |
| Leakage in coolant hoses, engine block, or water pump | Inspect for visible leaks. Verify tension of water pump serpentine drive belt. | |
| Unit cranks, but will not start | Fuel level low | Check fuel level in tank. Verify fuel pump operation. |
| Restricted air filter | Inspect air filter for blockage. Refer to OEM engine operator’s manual for additional information. | |
| Overspeed or Underspeed Shutdown | Frequency setting incorrect | Disconnect all loads and restart unit. Read frequency (Hz) in the LCD window on controller. Frequency should read 60 Hz. If frequency is above 60 Hz, engine speed will need to be adjusted. Refer to the engine operator’s manual for throttle adjustment information. |
| Mast Lights Off, but Ballast Indicators on Control Panel are On. | Light fixture is too hot. Faulty lamp connection. Lamp broken. Loose lighting connections. Damaged or loose electrical cord | Allow light to cool 10-15 minutes before restarting. Check that the lamp is tight in the socket. Check for broken arc tube or outer lamp jacket, broken or loose components in lamp envelope, or blackening/deposits inside tube. Check the connections inside the mast junction box and each mast light housing/socket. Check the mast electrical cord for damage and check the cord connections inside the control box. |
| Mast Lights Off, and Ballast Indicators on the Control Panel are Off. | Loose lighting connections. Generator output incorrect. Low transformer output. | Check the connections inside the control box and inside each ballast box. Check the incoming voltage to the ballast by checking the available voltage on the GFCI receptacle. Incoming voltage should be 120V +/- 5V. If voltage is incorrect, the engine speed may need to be adjusted or generator may require service. The voltage from the transformer should read approximately 400VAC as the light 'strikes' (induces an arc), then drop and slowly rise back up to stabilize at 240-260VAC. On hard wired models, remove the mast junction box cover and insert the wire probes into the connector blocks for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs to be replaced. |
| Mast Lights On But the Light Output is Low | Fixture and/or lens is dirty. Lamp worn due to normal use. Damaged or loose electrical connections. Generator output incorrect. Low transformer output. | Clean reflective surface inside fixture and both inside and outside surface of glass lens. Use mild soap and water to clean lens. Other chemicals may have an adverse effect on the glass. Replace lamp. Check the mast coil cord, mast junction box and mast light connections. Check the incoming voltage to the ballast. Incoming voltage should be 120V +/-5V. If the voltage is incorrect, the engine speed may need to be adjusted or the generator may require service. The voltage from the transformer should read approximately 400VAC as the light 'strikes' (induces an arc), then drop and slowly rise back up to stabilize at 240-260VAC. On hard wired models, remove the mast junction box cover and insert the wire probes into the connector blocks for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs to be replaced. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
11| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 002306 | Trailer Wheel Bearing Grease Zerk Fitting | 1 | Grease zerk fitting | PartsGeek |
| 003791 | GLOW PLUG | 1 | Glow plug | PartsGeek |
| 003792 | GLOW PLUG OFF | 1 | Glow plug | PartsGeek |
| 003793 | GLOW PLUG | 1 | Glow plug | PartsGeek |
| 003794 | GLOW PLUG OFF | 1 | Glow plug | PartsGeek |
| 003983 | Breakers Located Behind The Panel | 1 | Auxiliary outlet | PartsGeek |
| 004480 | Optional Lower Radiator Hose | Hose | PartsGeek | |
| 004625 | Control Panel | 1 | Auxiliary outlet | PartsGeek |
| 004742 | A | 1 | Lifting point | PartsGeek |
| 004550 | WARNING: Burn hazard. Lamps become extremely hot while in use. Allow 10–15 minutes for cooling before handling or lowering mast. Touching a hot lens or fixture can cause severe burns. | 1 | Service part / kit | PartsGeek |
| 004687 | wheel lug | 1 | 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 |
|---|---|---|---|
Available documents
Owner's manual — 10472 (Generac)