Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 177 kW |
| Standby kVA | 221 |
| Prime power | 162 kW |
| Emissions | Tier III |
| Controller | Magnum Digital (MDC) |
| Oil capacity | 31.2 L |
| Alternator | Marathon 431PSL6202 |
| Voltage options | 120 V, 139 V, 208 V, 220 V, 240 V, 277 V, 440 V, 480 V |
| Phase | 1Ø and 3Ø |
| Power factor | 1 (1Ø), 0.8 (3Ø) |
| Circuit breaker | 700 A |
| Battery group | Group 31 |
| Battery cranking | 1000 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Starting system | 12 V DC |
| Coolant capacity | 35.9 L |
| Max ambient | 49 °C |
| Dimensions (L×W×H) | 5330×2180×2360 mm |
| Dry weight | 2617 kg |
| Wet weight | 3792 kg |
| Sound level | 68.0 dBA @ 7 m |
| Fuel tank | 1295.0 L |
| Tank runtime | 21 hr |
Engine
| Oil capacity | 31.2 L |
|---|---|
| Coolant capacity | 35.9 L |
| Displacement | 6.8 L |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the John Deere PE6068HF485| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
Service intervals
5| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Engine oil and oil filter | Change | 250 hr | First service — First 100 hours; do not exceed 100 hours with break-in oil | |
| WrnMaintenance service reminder | Other | 250 hr | Reset time to service to 250 hours | |
| Belt | Inspect | 500 hr | 12 mo | Remove and check for wear; inspect pulleys and bearings |
| Diesel Particulate Filter (DPF) | Clean | 3000 hr | Expected service at least 3000 or 4500 hours; actual when indicator light appears | |
| Trailer wheel bearings | Lubricate | 12 mo | Or every 12,000 miles (19,312 km) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
18| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | Fuel level shutdown | 5 | % | shutdown |
| Other | Fuel level warning | 15 | % | low fuel warning |
| Pressure | Air filter restriction | 20 | in. H2O | replace air filter |
| Pressure | Engine oil pressure | 35-80 | psi | normal operating |
| Pressure | Engine oil pressure minimum | 5 | psi (34 kPa) | within five seconds |
| Pressure | Engine oil pressure shutdown | less than 20 | psi (138 kPa) | shutdown |
| Pressure | Primary air cleaner restriction | 25 | in. H2O | replace primary air cleaner |
| Speed | Operating speed | 1800 | rpm | |
| Temperature | Engine coolant temperature shutdown | 230 | °F (110°C) | shutdown |
| Temperature | Viscous fan clutch temperature range | 170-200 | °F (77-93°C) | depending on unit model |
| Torque | Generator drive plate bolts | 46 | ft-lbs | |
| Torque | Shorting (link) board 1/2 inch nuts | 25 | ft-lbs | MMG235 reconnect board |
| Torque | Wheel lug nuts | 20-25 | ft-lbs | first pass |
| Torque | Wheel lug nuts | 50-60 | ft-lbs | second pass |
| Torque | Wheel lug nuts | 90-120 | ft-lbs | third pass |
| Voltage | Battery voltage normal | 13-14 | V | 12 volt systems with engine running |
| Voltage | Fine voltage adjustment tolerance | 10 | % | within 45 seconds of start-up |
| Voltage | Voltage regulation | +/- 1 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Engine oil | John Deere Plus 50 II | Break-in oil supplied from factory; do not exceed 100 hours with break-in oil | |||
| Fuel | Ultra low sulfur diesel | Use clean diesel fuel only | |||
| Grease | High quality wheel bearing grease | For trailer wheel bearings |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
31| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| AnInIOM Sd | AnInIOM Sd | Shutdown alarm configurable on the input of IG-IOM/IGS-PTM. | Shutdown | |
| AnInIOM Wrn | AnInIOM Wrn | Warning alarm configurable on the input of IG-IOM/IGS-PTM. | Warning | |
| Battery Flat | Battery Flat | Controller switches off during starting sequence due to bad battery condition; does not try to start again. | Shutdown | |
| Binary Input | Binary Input | Configurable warning/shutdown alarms on the inputs of IL-NT. | Warning | |
| ChrgAlternFail | ChrgAlternFail | Failure of the alternator to charge the battery. | Warning | |
| EmergencyStop | EmergencyStop | If the input Emergency Stop is opened, shutdown is immediately activated. | Shutdown | |
| Engine Temp Sd | Engine Temp Sd | Water temperature is greater than Sd Water Temp setpoint. | Shutdown | |
| Engine Temp Wrn | Engine Temp Wrn | Water temperature is greater than Wrn Water Temp setpoint. | Warning | |
| Fgen<, > | Fgen<, > | Generator frequency is out of limits given by Gen >f and Gen <f setpoints. | Shutdown | |
| Fuel Level Sd | Fuel Level Sd | Fuel level is smaller than Sd Fuel Level setpoint. | Shutdown | |
| Fuel Level Wrn | Fuel Level Wrn | Fuel level is smaller than Wrn Fuel Level setpoint. | Warning | |
| GCB fail | GCB fail | Failure of the generator circuit breaker. | Shutdown | |
| Igen unbl | Igen unbl | The generator current is unbalanced. | Shutdown | |
| Low BackupBatt | Low BackupBatt | RTC backup battery is flat. | Warning | |
| Oil Press Sd | Oil Press Sd | Oil pressure is smaller than Sd Oil Press setpoint. | Shutdown | |
| Oil Press Wrn | Oil Press Wrn | Oil pressure is smaller than Wrn Oil Press setpoint. | Warning | |
| Overload | Overload | The load is greater than the value given by Overload setpoint. | Shutdown | |
| Overspeed | Overspeed | Protection comes active if speed is greater than Overspeed setpoint. | Shutdown | |
| ParamFail | ParamFail | Wrong checksum of parameters; controller stays in INIT mode. | Info | Check all parameters; write at least one new parameter. |
| PickupFault | PickupFault | Failure of the magnetic pick-up sensor for speed measurement. | Shutdown | |
| Sd IOM fail | Sd IOM fail | IOM/IGS-PTM module. | Shutdown | |
| SprinkIActive | SprinkIActive | Protection is active if the output Sprinkler is closed. | Warning | |
| Start failed | Start failed | Gen-set start failed. | Shutdown | |
| Stop fail | Stop fail | Gen-set stop failed. | Shutdown | |
| Ubat | Ubat | Battery voltage is out of limits given by Batt Overvolt and Batt Undervolt setpoints. | Warning | |
| Underspeed | Underspeed | During starting, speed can drop under Start RPM again; underspeed protection becomes active. | Shutdown | |
| Vgen unbl | Vgen unbl | Generator voltage is unbalanced more than Volt unbal setpoint. | Shutdown | |
| Vgen<, > | Vgen<, > | Generator voltage is out of limits given by Gen <V and Gen <V setpoints. | Shutdown | |
| Wrn ECM Alarm | Wrn ECM Alarm | ECM alarm list is not empty. | Warning | |
| Wrn RA15 fail | Wrn RA15 fail | Warning alarm in case of lost connection to IGL=RA15 module. | Warning | |
| WrnMaintenance | WrnMaintenance | Service period set by WrnMaintenance setpoint; running hours reached. | Warning |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Changing Output Voltage (MMG235 Only) adjustment
⚠ Never change voltage while engine is running.
Tools: Wrench
- Shut down generator; main breaker and control power OFF.
- Remove reconnect box door.
- Remove all 1/2 inch nuts holding shorting board.
- Move board to upper position for 208/120V 3Ø.
- Move board to lower position for 480/277V 3Ø.
- Replace hardware and tighten to 25 ft-lbs.
- Reinstall reconnect box door.
- Start generator and verify voltage.
Adjusting Display Back Lighting maintenance
- Press and hold Enter.
- Press up or down arrow to increase or decrease brightness.
- Release Enter when desired brightness is attained.
Checking Generator Drive Plate Torque maintenance
Tools: Torque wrench
- Disconnect engine starting battery.
- Remove generator fan guard.
- Torque each drive plate bolt to 46 ft-lbs.
- Reinstall fan guard.
- Reconnect battery.
Lubricating Trailer Wheel Bearings maintenance
Tools: Grease gun
- Remove small rubber plug on grease cap.
- Attach standard grease gun to grease zerk fitting.
- Pump grease until new grease is visible at nozzle.
- Wipe excess grease from hub with clean cloth.
- Replace rubber plug.
Resetting the Time to Service Reminder maintenance
- Power up controller with Control On/Off switch.
- Press PAGE SELECT; Alarm List appears.
- Press down arrow to select Engine Protect.
- Press Enter; WrnMaintenance appears.
- Press Enter; current run time appears.
- Press up arrow to set 250 hours.
- Press Enter to save.
- Move CONTROL switch to OFF / O.
AUTO (Remote) Starting of the Generator operation
⚠ Verify remote switch contacts are OPEN before AUTO.
Tools: Jumper wire minimum 16 gauge
- Perform manual start once to verify engine operation.
- Remove wires from remote start terminal block if testing.
- Press AUTO; LCD highlights AUTO.
- Jumper the two remote start terminals with minimum 16 gauge wire.
- Engine cranks, starts and runs.
- Remove jumper; engine stops.
- Reconnect remote start switch wires.
- Confirm AUT displayed; close main circuit breaker and lock doors.
Auto Exercise Timer operation
⚠ Controller must be in AUTO mode to run at programmed time.
- Press PAGE SELECT until Password appears.
- Select Date/Time and press ENTER.
- Select Timer1 Repeat and press ENTER.
- Choose day or days and press ENTER.
- Set Timer1 ON Time and press ENTER.
- Set Timer1Duration and press ENTER.
- Press PAGE SELECT three times to return.
- Press AUTO to switch to automatic mode.
Auxiliary Fuel Tank Operation operation
- Shut down unit; internal tank fuel above five percent.
- Attach auxiliary tank lines to AUXILIARY FUEL INLET and OUTLET.
- Open AUXILIARY FUEL INLET and OUTLET valves inside right front door.
Fuel Transfer Pump Option operation
- Shut down unit unless external bulk fuel supply already connected.
- Attach external bulk fuel supply to FUEL TRANSFER INLET fitting.
- Turn on Fuel Transfer Switch.
Manual Starting of the Generator operation
⚠ Do not start under load in MANUAL mode.
- Move CONTROL ON/OFF toggle switch to CONTROL ON / I.
- Confirm LCD shows MAN mode and Ready; Ready/Manual LED lit.
- Press green ENGINE START button.
- Wait for preheat countdown and cranking; engine starts.
- Allow 45-second V Detect countdown.
- Check for leaks, noise, vibration before applying load.
- Verify AC voltage and frequency approximately 60 Hz.
- Close main circuit breaker and convenience outlet breakers.
Shutting Down the Generator operation
- Remove all loads by opening all circuit breakers.
- Let engine run approximately five minutes to cool.
- Push red ENGINE STOP button.
- Wait for 15-second Stop Value timer.
- Move CONTROL ON/OFF switch to CONTROL OFF / O.
- Disconnect battery for extended storage.
Towing the Trailer operation
- Raise or lower trailer onto hitch; lock coupling.
- Attach safety chains or cables and raise jack foot.
- Connect trailer wiring; check stop and signal lights.
- Make sure all doors are properly latched.
- Check trailer tire inflation.
- Check wheel lugs; tighten loose or replace missing.
- Maximum highway towing speed 45 mph (72 km/h).
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 208/120V | 3-phase | 208/120V 3-PHASE | T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12; L1,L2,L3,N | L1-L2=208V; L2-L3=208V; L3-L1=208V; L1-N=120V; L2-N=120V; L3-N=120V |
| 208/120V 3Ø | 3-phase | MMG235 link board upper position | T1,T9,T11,T7,T10,T4,T12,T8,T3,T6,T2,T5 | Shorting (link) board upper position; torque 25 ft-lbs |
| 240/120V | 1-phase | 240/120V 1-PHASE | T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12; L1,L3,N | L1-L3=240V; L1-N=120V; L3-N=120V |
| 480/277V | 3-phase | 480/277V 3-PHASE | T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11,T12; L1,L2,L3,N | L1-L2=480V; L2-L3=480V; L3-L1=480V; L1-N=277V; L2-N=277V; L3-N=277V |
| 480/277V 3Ø | 3-phase | MMG235 link board lower position | T1,T9,T11,T7,T10,T4,T12,T8,T3,T6,T2,T5 | Shorting (link) board lower position; torque 25 ft-lbs |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the power rating of the Magnum MMG185?
The Magnum MMG185 is rated 177 kW standby (221.0 kVA).
What engine does the Magnum MMG185 use?
The Magnum MMG185 is powered by the John Deere PE6068HF485 engine.
What fuel does the Magnum MMG185 use?
The Magnum MMG185 runs on Diesel.
What's the oil capacity on a Magnum MMG185?
The John Deere PE6068HF485 engine in the Magnum MMG185 has an oil capacity of 31.2 liters.
What is the coolant capacity of the Magnum MMG185?
The Magnum MMG185 cooling system holds 35.9 liters (9.5 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the Magnum MMG185?
The Magnum MMG185 is rated 162 kW prime (202 kVA), against 177 kW standby.
How loud is the Magnum MMG185?
The Magnum MMG185 is rated at 68.0 dBA at 7 m, per the manufacturer specification sheet.
How much does the Magnum MMG185 weigh?
The Magnum MMG185 has a dry weight of 2617 kg (5769 lb).
What size fuel tank does the Magnum MMG185 have?
The Magnum MMG185 has a 1295 liter (342 US gallon) fuel tank, giving about 21 hours of runtime.
What voltage does the Magnum MMG185 produce?
The Magnum MMG185 is offered in 120 V, 139 V, 208 V, 220 V, 240 V, 277 V, 1Ø and 3Ø-phase.
What battery does the Magnum MMG185 use?
The Magnum MMG185 uses 1 battery, 12 V each, 1000 CCA, group Group 31, per the manufacturer specification sheet. The starting system is 12 V DC.
What alternator does the Magnum MMG185 use?
The Magnum MMG185 uses a Marathon 431PSL6202 alternator.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low fuel level shut down | Fuel level low or inaccurate reading; leaks in the fuel tank; fuel level sender and connecting wiring damaged | Check the fuel level on the LCD window and confirm the generator is sitting level; check for leaks in the fuel tank; check the fuel level sender and the connecting wiring for damage and check for continuity between the sender and the engine controller |
| Low oil pressure shut down | Low engine oil level; oil leaks; loss of oil pressure; faulty oil pressure sender | Check the level of the engine oil with the dipstick and add oil if required; visually inspect the engine for oil leaks; restart the unit and verify the loss of oil pressure, shutting the engine down immediately if the oil pressure value does not read five psi (34 kPa) within five seconds; check the oil pressure sender and refer to the troubleshooting section of the engine operation and maintenance manual |
| Low coolant level shut down | Low coolant level; leaks in coolant hoses, engine block or water pump; coolant mixed with engine oil | Allow the engine to cool; check the coolant level in the radiator and add coolant until it is 3/4" below the filler neck, then secure the radiator cap; inspect coolant hoses, engine block and water pump for visible leaks; check engine oil to verify no coolant has mixed with it and consult the engine operation and maintenance manual |
| High coolant temperature shut down | Low coolant level; blocked radiator shroud and ducting; leaks in coolant hoses, engine block or water pump; loose serpentine drive belt for the water pump; engine overheating | Check the coolant level in the overflow jug; restart the engine and read the coolant temperature to verify High Coolant Temperature Shut down, stopping the engine immediately if the coolant temperature is 230°F (110°C) or more; allow the engine to cool, add coolant to the overflow jug if it is low and check the level of coolant in the radiator, adding coolant until it is 3/4" below the filler neck and securing the radiator cap; check the 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 serpentine drive belt for the water pump; if no other problems are found, remove the load on the generator and restart the engine, checking the coolant temperature and shutting the engine down immediately if it starts to overheat, and consult the engine operation and maintenance manual |
| Overcrank shut down | Low fuel level in tank; improper operation of the fuel pump; blocked air filter; engine will not start | Check the fuel level in tank; check for proper operation of the fuel pump; check air filter for blockage; if the engine will not start, consult the engine operation and maintenance manual for additional information on troubleshooting starting problems |
| Overspeed or underspeed shut down | Frequency above or below 60.0 Hz; engine speed requires adjustment | Disconnect all loads and restart the generator, reading the frequency (Hz) on the LCD display (with no loads the frequency should read 60.0 Hz); if the frequency is above or below 60.0 Hz, adjust the engine speed — see the engine manual for throttle adjustments on mechanical governed units and 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. Full Magnum MMG185 troubleshooting guide (12 entries) →
Repair guides
6- Adjusting Display Back Lighting
- Auto Exercise Timer
- Auxiliary Fuel Tank Operation
- Changing Output Voltage (MMG235 Only)
- Checking Generator Drive Plate Torque
- Resetting the Time to Service Reminder
Step-by-step procedures compiled from the Magnum service manual for this model.
Parts
2| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-001 | Air Filter | 1 | Air filter | Amazon Amazon eBay eBay |
| 30175 | Decal, UN31A tank caution | 1 | Service part / kit | Amazon eBay NAPA $12.21 FridayParts $85.00 |
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 | 65.8 | 17.38 | |
| Prime | 50% | 28.8 | 6.6 |
| Prime | 75% | 43.2 | 9.5 |
| Prime | 100% | 28.0 | 7.4 |
| Standby | 100% | 28.0 | 7.4 |
Available documents
Spec sheet — MMG185 Mobile (Magnum)Operator's manual — 26277 (Magnum)Service manual — MMG235 (Operation) (Magnum)
This page was generated from the 3 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.