The Magnum MMG185D Super Start is a 284 kW standby generator set powered by a John Deere PE6068HF485 engine. It is available at 120 V, 139 V, 208 V, 220 V, 240 V and 277 V, 3-phase, 60 Hz and rated 414 A. It holds about 14.5 L (3.8 gal) of oil and 29.8 L (7.9 gal) of coolant. Starting uses 1 group-31 battery rated 1000 CCA at 12 V. The set weighs about 3421 kg (7542 lb). An integrated tank holds 1295 L (342.1 gal), roughly 32 hours of runtime. The same PE6068HF485 engine also powers generator sets from John Deere.
What is the power rating of the Magnum MMG185D Super Start?
The Magnum MMG185D Super Start is rated 284 kW standby.
What engine does the Magnum MMG185D Super Start use?
The Magnum MMG185D Super Start is powered by the John Deere PE6068HF485 engine.
What is the oil capacity of the Magnum MMG185D Super Start?
The John Deere PE6068HF485 engine in the Magnum MMG185D Super Start has an oil capacity of 13.7 liters.
What alternator does the Magnum MMG185D Super Start use?
The Magnum MMG185D Super Start uses a Marathon 432PSL6216 alternator.
Troubleshooting
8
Fault codes
Code
Meaning
SD
Sensor fail (FLS)
WRN
Warning (WRN)
Symptoms & remedies
Symptom
Cause
Remedy
LOW FUEL LEVEL SHUT DOWN
Fuel level on the Liquid Crystal Display (LCD) window is low or fuel tank has leaks.
Check the fuel level and ensure it is not running dry. Check for leaks in the fuel tank.
LOW OIL PRESSURE SHUT DOWN
Engine oil pressure is less than 20 psi (138 kPa).
Check engine oil level and add oil if required. Visually inspect the engine for oil leaks.
LOW COOLANT LEVEL SHUT DOWN
Coolant level in the radiator is low or coolant lines have visible leaks.
Check the coolant level and add coolant if necessary. Inspect for leaks in coolant hoses, engine block, and water pump.
HIGH COOLANT TEMPERATURE SHUT DOWN
Coolant temperature is 230°F (110°C) or more.
Check coolant level in the overflow jug and add coolant if necessary. Inspect radiator, coolant hoses, engine block, water pump for leaks. Check serpentine drive belt tension.
OVERCRANK SHUT DOWN
Engine will not start.
Check fuel level in tank and proper operation of the fuel pump. Check air filter for blockage.
OVERSPEED OR UNDERSPEED SHUT DOWN
Engine speed is above or below 60.0 Hz.
Disconnect all loads and restart the generator to read frequency (Hz). Adjust engine speed as necessary.
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
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.