Specifications
| Standby power | 52 kW |
|---|---|
| Standby kVA | 65 |
| Prime power | 47 kW |
| Controller | Mobile Digital |
| Alternator | Generac G350 (6-pole, Class H insulation) |
| Voltage options | 120/240 V, 240 V |
| Phase | 3-phase |
| Rated current | 125 A |
| Power factor | 0.8 |
| Dimensions (L×W×H) | 2134×1016×1524 mm |
| Dry weight | 987 kg |
| Fuel tank | 280.0 L |
| Tank runtime | 64.375 hr |
Maintenance & consumables
for the John Deere E3805| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 250 hr | find | ||
| Fuel filter | — | 250 hr | find | ||
| Oil filter | — | 500 hr | find | ||
| Belt | — | 500 hr | find | ||
| Coolant | 4.7 L | — | 2000 hr | ||
| Oil | 4.7 L | — | 50 hr |
Common questions
What is the power rating of the Generac MMG55FH?
The Generac MMG55FH is rated 52 kW standby (65.0 kVA).
What engine does the Generac MMG55FH use?
The Generac MMG55FH is powered by the John Deere E3805 engine.
What alternator does the Generac MMG55FH use?
The Generac MMG55FH uses a Generac G350 alternator. It has 6 poles. Insulation class H.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low Fuel Level Shut Down | Check fuel level on LCD display. Check for fuel tank leaks. The engine controller will shut the engine down when there is five percent of fuel remaining in the tank. | Check the fuel level sender and connecting wiring for damage. To check for continuity between sender and engine controller, remove the appropriate bolts from control panel to access the inside of the control box. Consult the appropriate DC wiring diagram for the proper path between the engine controller and the fuel level sender. |
| Low Oil Pressure Shut Down | Check the engine oil level with the dipstick. Add oil if required. Inspect engine for oil leaks. | If oil level is good, restart the unit and verify loss of oil pressure. Shut the engine down immediately if the oil pressure value does not read 5 psi (34 kPa) within five seconds. Check oil pressure sender. To identify corrective action, refer to the troubleshooting section of the engine operator’s manual provided with the unit. |
| Low Coolant Level Shut Down | Allow engine to cool. Confirm unit is level to ensure an accurate reading. | Check coolant level in radiator. Open the front hood to access the radiator cap. Add coolant until it is 3/4 in. (1.9 cm) below filler neck. Secure the radiator cap back into its original position. Inspect coolant hoses, engine block and water pump for visible leaks. Check engine oil to verify no coolant has mixed with it. Oil will appear milky if coolant is present. |
| High Coolant Temperature Shut Down | Check coolant level in overflow jug. | Restart engine and read coolant temperature to verify high coolant temperature shutdown. Stop engine immediately if coolant temperature is 230°F (110°C) or more. Allow engine to cool. Add coolant to overflow jug if it is low and then check coolant level in radiator. Open front hood to access the radiator cap. Add coolant until it is 3/4 in. (1.9 cm) below filler neck. Secure radiator cap back into its original position. Check 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 water pump belt. If no other problems are found, remove the load on the generator and restart the engine. Check the coolant temperature and shut the engine down immediately if it starts to overheat. |
| Overcrank Shut Down | Check fuel level in tank. Check for proper operation of the fuel pump. Check air filter for blockage. | If engine will not start, consult the engine operation and maintenance manual. |
| Overspeed or Underspeed Shut Down | Disconnect all loads and restart generator. Read the frequency (Hz) on the display. With no loads on the generator, the frequency should read 60.0 Hz. | If frequency is above or below 60.0 Hz, the engine speed needs to be adjusted. See the engine manual for throttle adjustments on mechanical governed units and see the electronic governor manual for electronically controlled units. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
6| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 002823a | Grease | 1 | Grease | PartsGeek |
| 002824a | Oil | 1 | Oil | PartsGeek |
| 002825a | Oil | 1 | Oil | PartsGeek |
| 000300 | WARNING: Crushing Hazard. Stay clear of hood and lift structure when opening and closing generator hoods. Failure to do so could result in death or serious injury. | Service part / kit | PartsGeek | |
| 002787 | WARNING: Crushing Hazard. Stay clear of hood and lift structure when opening and closing generator hoods. Failure to do so could result in death or serious injury. | Service part / kit | PartsGeek | |
| 002788 | WARNING: Crushing Hazard. Stay clear of hood and lift structure when opening and closing generator hoods. Failure to do so could result in death or serious injury. | 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 | |||
| Standby |
Available documents
Owner's manual — 24594 (Generac)Owner's manual — 29663 (Generac)