Service parts for the MMG320
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 278 kW |
| Standby kVA | 348 |
| Prime power | 256 kW |
| Emissions | Tier III approved |
| Controller | Magnum Digital (MDC) |
| Oil capacity | 34.0 L |
| Alternator | Marathon 432PSL6210 |
| Voltage options | 480 V |
| Phase | 3 |
| Rated current | 334.4 A |
| Power factor | 1 |
| Circuit breaker | 1200 A |
| Battery group | Group 31 |
| Battery cranking | 1000 CCA |
| Battery voltage | 12V V |
| Battery quantity | 2 |
| Coolant capacity | 70.9 L |
| Max ambient | 120°F °C |
| Dimensions (L×W×H) | 3960×1520×2290 mm |
| Dry weight | 3646 kg |
| Wet weight | 5215 kg |
| Sound level | 68.0 dBA @ 23 ft m |
| Fuel tank | 459.0 L |
| Tank runtime | 24 hr |
Engine
| Oil capacity | 34.0 L |
|---|---|
| Coolant capacity | 38.0 L |
| Displacement | 9.0 L |
| Aspiration | turbocharged, intercooled |
| Rated speed | 1500 rpm |
Filters for the John Deere 6090HF485
5Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P550938 | Lube Filter, Cartridge | JOHN DEERE RE509672, JOHN DEERE RE530656, NAPA 1370, LIEBHERR 11212420 | KuduParts $16.00 |
| Fuel filter | P550090 | Fuel Filter, In-Line | JOHN DEERE AE20952, JOHN DEERE AT101565, ASV INCORPORATED 0201914, LOESING 025125 | FridayParts $45.66 |
| Fuel filter | P502392 | Fuel Filter, Box | JOHN DEERE N378886, BALDWIN BF7912, SEPAR 01030, SEPAR 01030HV | FridayParts $39.99 |
| Fuel / water separator | P552952 | Fuel Filter, Water Separator Spin-On | JOHN DEERE DZ130550, JOHN DEERE RE532952, NAPA 3969, BALDWIN BF9866-O | FridayParts $59.99 |
| Fuel / water separator | P551858 | Fuel Filter, Water Separator Spin-On | JOHN DEERE AT365869, JOHN DEERE RE503676, NAPA 3780, BALDWIN BF1265 | FridayParts $39.00 KuduParts $48.00 |
Same engine, other brands
1 brandThe John Deere 6090HF485 in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| John Deere | QAS 330 |
Maintenance & consumables
for the John Deere 6090HF485| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Replace when restriction indicator gauge shows a vacuum of 20 in. H2O (yellow center bar reaches red section); replace primary air cleaner at 25 in. H2O | — | 1500 hr | ||
| Fuel filter | Fuel Filter | — | 2000 hr | ||
| Oil filter | last changed 10/25/2024 | RE538245 | 8803 hr | Amazon eBay $39.99 NAPA $33.32 KuduParts $16.00 | |
| Battery | Group 31, 1000 CCA | — | 500 hr | ||
| Belt | Fan Belt | — | 2000 hr | ||
| Coolant | Consult the engine operation and maintenance manual for coolant recommendations and proper mixture | 16.0 | — | 3000 hr | |
| Coolant filter | Glycol level in coolant | — | 2000 hr | ||
| Oil | John Deere PLUS-50 or equivalent | 45.0 | — | 2000 hr | |
| Spark plug | Spark Plug | — | 1000 hr |
Compatible filters for the John Deere 6090HF485 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.
Service intervals
21| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Engine oil and oil filter | Change | 250 hr | First service — Change after first 100 hours, then every 250 hours. If John Deere PLUS-50 or equivalent is used, every 500 hours. | |
| Oil vapor recirculation system/non-return valve | Check | 250 hr | ||
| Air intake hoses, connections, and system | Check | 500 hr | 12 mo | |
| Battery | Inspect | 500 hr | 12 mo | Service battery |
| Belt tensioner and belt wear | Check | 500 hr | 12 mo | At 500 hour/12 month interval, remove belt and check for wear; inspect pulleys and bearings |
| Coolant pump weep hole foam filter | Check | 500 hr | 12 mo | |
| Cooling system | Check | 500 hr | 12 mo | |
| Engine ground connection | Check | 500 hr | 12 mo | |
| Engine mounts | Check | 500 hr | 12 mo | |
| Fuel filters/water separator | Replace | 500 hr | 12 mo | Replace fuel filters/clean water separator |
| Generator drive plate torque | Check | 500 hr | 12 mo | See page 45 |
| Leveling jack(s) | Lubricate | 500 hr | 12 mo | |
| Oil vapor recirculation filter | Replace | 500 hr | 12 mo | |
| Thermostats | Test | 500 hr | 12 mo | |
| Air cleaner elements | Replace | 2000 hr | 24 mo | |
| Alternator and fan belts | Replace | 2000 hr | 24 mo | |
| Coolant | Check | 2000 hr | 24 mo | Add coolant |
| Electrical wiring and connections | Check | 2000 hr | 24 mo | |
| Fuel system | Drain | 2000 hr | 24 mo | Bleed fuel system |
| Fuses | Check | 2000 hr | 24 mo | |
| Engine oil filter | Change | 8803 hr | Last changed 10/25/2024, 8803HRS |
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
27| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | Engine hours at test steps | 8801.8 / 8801.9 / 8802.1 / 8802.4 / 8802.6 / 8802.9 / 8803 | hours | warm up through cool down |
| Other | Fine voltage adjustment window (V Detect) | 45 | seconds | |
| Other | Fuel level low fuel shutdown setpoint | 5 | % | |
| Other | Fuel level low fuel warning setpoint | 15 | % | |
| Other | Load bank output (start / 15min / 30min / 45min / 1hr) | 270 | kW | at ~324-327 A per phase, 482-484 V, 60 Hz, power factor 1 |
| Pressure | Air filter restriction indicator - replace element | 20 | in. H2O | |
| Pressure | Air filter restriction indicator - replace primary air cleaner | 25 | in. H2O | |
| Pressure | Engine oil pressure, low oil pressure shut down | less than 20 | psi (138 kPa) | |
| Pressure | Engine oil pressure, normal operating | 35-80 | psi (241-552 kPa) | engine running |
| Pressure | Engine oil pressure, verify within 5 seconds of start | 5 | psi (34 kPa) | within 5 seconds of start |
| Pressure | Oil pressure (warm up / start / 15min / 30min / 45min / 1hr / cool down) | 44 / 36 / 35 / 34 / 32 / 32 / 36 | not stated | load bank test 10/25/2024 |
| Speed | Generator frequency, no load | 60.0 | Hz | no load |
| Speed | Operating speed | 1800 | rpm | |
| Temperature | Ambient temperature (warm up / start / 15min / 30min / 45min / 1hr / cool down) | 49 / 49°F / 49°F / 50°F / 50°F / 50°F / 50°F | °F | load bank test 10/25/2024 |
| Temperature | Coolant temperature (warm up / start / 15min / 30min / 45min / 1hr / cool down) | 104 / 185°F / 186°F / 186°F / 186°F / 188°F / 165°F | °F | load bank test 10/25/2024 |
| Temperature | Coolant temperature minimum display | 100 | °F (38°C) | |
| Temperature | Maximum water/coolant temperature shut down | 230 | °F (110°C) | |
| Temperature | Viscous fan clutch temperature range | 170-200 | °F (77-93°C) | |
| Torque | Generator drive plate bolts | 33 | ft-lb (45 Nm) | |
| Torque | Shorting (link) board hardware | 25 | ft-lbs | |
| Torque | Trailer wheel lug nuts, first pass | 20-25 | ft-lbs (27-33 Nm) | |
| Torque | Trailer wheel lug nuts, second pass | 50-60 | ft-lbs (67-81 Nm) | |
| Torque | Trailer wheel lug nuts, third pass | 90-120 | ft-lbs (122-162 Nm) | |
| Voltage | Battery voltage, normal reading on 12 volt systems | 13-14 | V | engine running |
| Voltage | Battery voltage, normal reading on 24 volt systems | 24-26 | V | engine running |
| Voltage | DC voltage (all steps) | 13.7 | V | load bank test 10/25/2024 |
| 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 |
|---|---|---|---|---|---|
| Coolant | 60/40 | Cold weather applications | |||
| Engine oil | John Deere PLUS-50 or equivalent | Consult the engine operation and maintenance manual for the proper grade of oil, including special operating conditions. If John Deere PLUS-50 or equivalent is used, oil can be changed every 500 hours. | |||
| Fuel | diesel | 459.0 gal | Steel, single wall fuel tank; 24 hr. run time – full load | ||
| Grease | High quality grease made specifically for lubrication of wheel bearings | Trailer wheel bearings; minimum lubrication every 12 months or 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.
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 (low battery) | If the controller switches off during starting sequence due to bad battery condition, it doesn't try to start again and activates this protection. | Shutdown | |
| Binary Input | Binary Input | Configurable warning/shutdown alarms on the inputs of IL-NT. | ||
| ChrgAlternFail | ChrgAlternFail | Failure of the alternator to charge the battery. | Warning | |
| EmergencyStop | EmergencyStop | If the input Emergency Stop is opened or the red E-Stop button is pushed, 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<, > | The 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 (5%). | Shutdown | |
| Fuel Level Wrn | Fuel Level Wrn | Fuel level is smaller than Wrn Fuel Level setpoint (15%). | 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 (low). | Warning | |
| Oil Press Sd | Oil Press Sd | Oil pressure is smaller than Oil Press Sd setpoint. | Shutdown | |
| Oil Press Wrn | Oil Press Wrn | Oil pressure is smaller than Oil Press Wrn setpoint. | Warning | |
| Overload | Overload | The load is greater than the value given by Overload setpoint. | Shutdown | |
| Overspeed | Overspeed | The protection comes active if the speed is greater than Overspeed setpoint. | Shutdown | |
| ParamFail | ParamFail | Wrong checksum of parameters. Happens typically after downloading new firmware or changing of the parameter. The controller stays in INIT mode. | 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 | The protection is active if the output Sprinkler is closed. | Warning | |
| Start failed | Start failed | Unit did not start. | Shutdown | |
| Stop fail | Stop fail | Unit did not stop. | Shutdown | |
| Ubat | Ubat | Battery voltage is out of limits given by Batt Undervolt setpoints. | Warning | |
| Underspeed | Underspeed | During starting, when the RPM reaches Starting RPM setpoint the starter switches off and speed can drop under Start RPM again; underspeed protection becomes active. Evaluation starts 5 seconds after start up. | Shutdown | |
| Vgen unbal | Vgen unbal | The generator voltage is unbalanced more than the value of Volt unbal setpoint. | Shutdown | |
| Vgen<, > | Vgen<, > | The generator voltage is out of limits given by Gen <V and Gen >V setpoints. | Shutdown | |
| Wrn ECU Alarm | Wrn ECU Alarm | ECU 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 | The period for servicing is set by the WrnMaintenance setpoint. The protection comes active if the running hours of the engine reach this value (250 hours). | 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
12Adjusting the Display Back Lighting adjustment
- Press and hold Enter.
- Press the up or down buttons on the Diagnostics keypad to increase or decrease brightness.
- Release the Enter button when the desired brightness is attained.
Changing Output Voltage adjustment
⚠ NEVER ATTEMPT TO CHANGE THE VOLTAGE WHILE THE ENGINE IS RUNNING. LETHAL VOLTAGE MAY BE PRESENT AT THE CONNECTION LUGS ON THE SHORTING (LINK) BOARD.
Tools: Wrench, Torque wrench
- Shut the generator down and set main circuit breaker and control power switch to OFF.
- Remove all 1/2 in. nuts holding the shorting (link) board.
- Move the board to the lower position for 480/277V 3Ø or the upper position for 208/120V 3Ø.
- Replace all hardware and tighten to 25 ft-lbs of torque.
- Reinstall the reconnect box door and start the generator per the Pre-Start Check List.
Resetting of the Time to Service Reminder adjustment
- With the unit shut down, power up the controller with the Control On/Off toggle switch.
- Press Page Select, move the cursor down to Engine Protect and press Enter.
- Press Enter; the current run time in hours appears under WrnMaintenance.
- Press the up arrow and reset the current run time hour setting to 250.
- Press Enter to save the current run time hour setting.
- Move the CONTROL ON/I toggle switch to the CONTROL OFF/O position.
Checking Generator Drive Plate Torque maintenance
Tools: Torque wrench
- Disconnect the engine starting battery.
- Remove the generator fan guard.
- Torque each of the drive plate bolts to 33 ft-lb (45 Nm).
- Reinstall the generator fan guard and reconnect the battery.
Trailer Wheel Bearings maintenance
Tools: Grease gun
- Remove the small rubber plug on the grease cap.
- Attach a standard grease gun fitting to the grease zerk fitting.
- Pump grease into the fitting until new grease is visible around the nozzle.
- Wipe any excess grease from the hub and replace the rubber plug.
AUTO (Remote) Starting of the Generator operation
- Perform a manual start of the generator at least once to verify correct operation.
- Press the AUTO button; LCD window highlights AUTO in the upper left corner.
- Close the main circuit breaker (set to ON/I).
- Secure the generator by closing and locking all access doors.
- The generator is now ready for remote starting.
Auto Exercise Timer operation
⚠ The controller must be in AUTO mode to run at the programmed time.
- Press the PAGE SELECT button until Password appears at the top of the screen.
- Press the down arrow to select Date/Time and press ENTER.
- Press the down arrow to select Timer1 Repeat and press ENTER; choose the day(s) and press ENTER.
- Select Timer1 ON Time and press ENTER; adjust the desired start time.
- Select Timer1Duration and press ENTER; set the run duration.
- Press PAGE SELECT three times to return to the main menu.
- Press the AUTO button to switch modes to automatic.
Auxiliary Fuel Tank Option operation
- Shut down the unit and check that the internal tank fuel level is above five percent.
- Attach the auxiliary fuel tank fuel lines to the AUXILIARY FUEL INLET and AUXILIARY FUEL OUTLET fittings.
- Open the AUXILIARY FUEL INLET and AUXILIARY FUEL OUTLET valves inside the right front door.
Fuel Transfer Pump Option operation
- Shut down the unit (not required if external bulk supply is already connected).
- Attach the external bulk fuel supply to the FUEL TRANSFER INLET fitting.
- Turn on the fuel transfer switch.
Manual Starting of the Generator operation
⚠ CARBON MONOXIDE: USING A GENERATOR INDOORS CAN KILL YOU IN MINUTES!
- Move the control ON/OFF toggle switch to the CONTROL ON/I position.
- LCD window indicates MAN mode and Ready; Ready/Manual LED is lit.
- Press the green ENGINE START button.
- Prestart (Preheat) screen is displayed with a countdown from 20 seconds to zero.
- Starting screen is displayed; the engine cranks and starts running.
- Running screen displays.
- LCD toggles between Generator Display Screen and Engine Display Screen.
- If engine does not start, controller pauses 15 seconds and makes two more attempts (three total).
- If no start after three cycles, LCD shows SD Start Fail; wait two minutes and press FAULT RESET.
- Engine speeds up to a constant 1800 rpm.
- Check for excessive noise or vibration and coolant, oil or fuel leaks before applying loads.
- Check AC output voltage; fine adjust with the fine voltage adjustment screw if needed.
- Check frequency reads approximately 60 Hz with no loads.
- Switch main circuit breaker ON, then convenience outlet breakers as needed.
Shutting Down the Generator operation
⚠ If the unit does not shut down within 15 seconds, a Stop Fail alarm is displayed.
- Open all circuit breakers to remove loads from the generator.
- Let the engine run approximately five minutes to allow it to cool down.
- Push the red ENGINE STOP button; a 15 second Stop Value timer starts.
- Move the CONTROL ON/OFF toggle switch to the CONTROL OFF/O position.
Towing the Trailer operation
- Use the jack to raise or lower the trailer onto the hitch; lock the hitch coupling.
- Attach the safety chains or cables to the vehicle and raise the jack foot completely.
- Connect trailer wiring; check stop and signal lights.
- Make sure all doors are properly latched.
- Check trailer tire inflation.
- Check the wheel lugs and tighten or replace any loose or missing.
- Limit highway towing speed to 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 |
|---|---|---|---|---|
| Cam lock connections | L1 - Black, L2 - Red, L3 - Blue, N (Neutral) - White, G (Ground) - Green | Series 16 taper nose 400A, 600V cam locks; make all connections to one side only | ||
| 120 | 3 | Low Delta | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 120/208V | three phase | Low Wye | Link / Reconnect Board | |
| 120/240V | single phase | Zig Zag | 4 position phase switch option | |
| 120/240V | three phase | Delta | 4 position phase switch option | |
| 208/120 | 3 | Link board attached in 208 VOLT 3Ø position (upper position) | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Shorting (link) board upper position |
| 208/120 | 3 | Low Wye | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 240/120 | 1 | Low Zig Zag | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 240/120 | 3 | High Delta | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 277/480V | three phase | High Wye | Link / Reconnect Board | |
| 480/240 | 1 | High Zig Zag | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 480/277 | 3 | High Wye | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Dedicated 12 lead generators option |
| 480/277 | 3 | Link board attached in 480 VOLT 3Ø position (lower position) | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 | Shorting (link) board lower position |
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
How many kW is the Magnum MMG320?
The Magnum MMG320 is rated 278 kW standby (348.0 kVA).
What engine is in the Magnum MMG320?
The Magnum MMG320 is powered by the John Deere 6090HF485 engine.
What fuel does the Magnum MMG320 use?
The Magnum MMG320 runs on Diesel.
How much oil does the Magnum MMG320 take?
The John Deere 6090HF485 engine in the Magnum MMG320 has an oil capacity of 34.0 liters.
What is the cooling system capacity of the Magnum MMG320?
The Magnum MMG320 cooling system holds 70.9 liters (18.7 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the Magnum MMG320?
The Magnum MMG320 is rated 256 kW prime (320 kVA), against 278 kW standby.
How loud is the Magnum MMG320?
The Magnum MMG320 is rated at 68.0 dBA at 23 ft m, per the manufacturer specification sheet.
How much does the Magnum MMG320 weigh?
The Magnum MMG320 has a dry weight of 3646 kg (8038 lb).
How big is the fuel tank on the Magnum MMG320?
The Magnum MMG320 has a 459 liter (121 US gallon) fuel tank, giving about 24 hours of runtime.
What voltages is the Magnum MMG320 available in?
The Magnum MMG320 is offered in 480 V, 3-phase.
What size battery does the Magnum MMG320 need?
The Magnum MMG320 uses 2 batteryies, 12V V each, 1000 CCA, group Group 31, per the manufacturer specification sheet.
Which alternator is fitted to the Magnum MMG320?
The Magnum MMG320 uses a Marathon 432PSL6210 alternator.
What oil filter does the Magnum MMG320 use?
The Magnum MMG320 uses oil filter part number RE538245.
Which fuel filter part number does the Magnum MMG320 take?
The Magnum MMG320 uses fuel filter part numbers JOHN DEERE N378886, JOHN DEERE AR103220.
What air filter does the Magnum MMG320 use?
The Magnum MMG320 uses air filter part numbers JOHN DEERE RE587794, JOHN DEERE 4S00686R.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| LOW FUEL LEVEL SHUT DOWN | Fuel level is low or fuel tank has leaks. | Check and refill fuel. Inspect for leaks. |
| LOW OIL PRESSURE SHUT DOWN | Oil pressure is less than 20 psi (138 kPa). | Check oil level, inspect for leaks, check oil pressure sender. |
| LOW COOLANT LEVEL SHUT DOWN | Coolant level is low or coolant lines have leaks. | Check and refill coolant. Inspect for leaks. Check engine oil for contamination. |
| HIGH COOLANT TEMPERATURE SHUT DOWN | Coolant temperature is 230°F (110°C) or more. | Check coolant level, add if necessary. Inspect for leaks. Check radiator shroud and ducting. Adjust water pump belt tension. |
| OVERCRANK SHUT DOWN | Engine will not start. | Check fuel level, fuel pump operation, air filter for blockage. Refer to engine manual for additional troubleshooting. |
| OVERSPEED OR UNDERSPEED SHUT DOWN | Engine speed is above or below 60.0 Hz. | Disconnect loads and check frequency. Adjust engine speed as needed. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
7- Auto Exercise Timer
- Auxiliary Fuel Tank Option
- Changing Output Voltage
- Fuel Transfer Pump Option
- Manual Starting of the Generator
- Resetting of the Time to Service Reminder
- Trailer Wheel Bearings
Step-by-step procedures compiled from the Magnum service manual for this model.
Parts
2| Part # | Description | Qty | System | |
|---|---|---|---|---|
| CB125110-200 | Coolant heater, HotStart, 2500W, 120V | 1 | Service part / kit | eBay |
| GM106699-S | Battery (Kohler) | 1 | Service part / kit | Amazon eBay |
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 | 50% | 34.1 | 9.0 |
| Prime | 75% | 50.7 | 13.4 |
| Prime | 100% | 67.8 | 17.9 |
Available documents
Spec sheet — MMG320 Mobile (Magnum)Spec sheet — Magnum-MMG320-spec-sheet (Magnum)Operator's manual — Magnum-Mobile-Products-manual-operations-Diesel-Generator-MMG320-MMG405-MMG465D. (Magnum)Reference — Magnum-MMG320-SN-1302032-Load-Test-Report-and-Inspection-Checklist (Magnum)
This page was generated from the 4 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.