Service parts for the MDDC
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredBelts
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 | 40 kW |
| Standby kVA | 40 |
| Emissions | EPA Tier 3 |
| Controller | Cummins Onan Digital Display / Control Switch |
| Oil capacity | 12.6 L |
| Alternator | Single Bearing, 4-Pole Rotating Field, Brushless (4-pole) |
| Voltage options | 120/240 V, 12 V |
| Phase | 1 |
| Rated current | 363.6/181.8 (110/220); 347.8/173.9 (115/230); 333.3/166.7 (120/240) A |
| Power factor | 0.8 |
| Battery cranking | 640 Amps (12 VDC) / 570 Amps (24 VDC) CCA |
| Battery voltage | 12/24 VDC V |
| Coolant capacity | 14 L |
| Dimensions (L×W×H) | 1738×840×1039 mm |
| Dry weight | 1320 kg |
| Wet weight | 998 kg |
| Sound level | 72.0 dBA @ 1 m |
Engine
| Oil capacity | 12.6 L |
|---|---|
| Coolant capacity | 14.0 L |
| Displacement | 4.5 L |
| Aspiration | turbocharged |
| Rated speed | 1800 rpm |
Filters for the John Deere 4045TFM
6Engine-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 | P551352 | Lube Filter, Spin-On Full Flow | JOHN DEERE DZ118286, JOHN DEERE PMLF3703, NAPA 401062, BALDWIN B40168 | buy |
| Oil filter | P550020 | Lube Filter, Spin-On Full Flow | JOHN DEERE AR58956, JOHN DEERE AT19044T, NAPA 1243, RENAULT VI 0003132302 | KuduParts $23.00 FridayParts $25.67 |
| Fuel filter | P551130 | Fuel Filter, Box | JOHN DEERE AR50041, JOHN DEERE R16951, NAPA 3370, BALDWIN BF909 | KuduParts $37.00 |
| Fuel filter | P550090 | Fuel Filter, In-Line | JOHN DEERE AE20952, JOHN DEERE AT101565, ASV INCORPORATED 0201914, LOESING 025125 | FridayParts $45.66 |
| Fuel / water separator | P551423 | Fuel Filter, Water Separator Spin-On | JOHN DEERE RE503254, JOHN DEERE RE50455, NAPA 3531, NAPA 600091 | KuduParts $18.00 FridayParts $20.00 |
| Fuel / water separator | P551424 | Fuel Filter, Water Separator Spin-On | JOHN DEERE RE503198, JOHN DEERE RE522868, NAPA 3532, NAPA 600094 | KuduParts $16.00 FridayParts $18.50 |
Maintenance & consumables
for the John Deere 4045TFM| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Clean and oil if restriction greater than 25 inches (635 mm) WC | 140-3752 | 700 hr | Amazon eBay $49.95 | |
| Fuel filter | 10 to 30 micron water-separator fuel filter | — | 700 hr | ||
| Fuel filter | Fuel Filter | 149-2106 | Amazon eBay $34.99 NAPA $61.61 KuduParts $68.00 | ||
| Oil filter | 185-7444 | 350 hr | Amazon eBay $29.95 NAPA $9.09 KuduParts $11.00 FridayParts $13.23 | ||
| Belt | V-Belt | 511-0197 | Amazon eBay | ||
| Coolant | Fully formulated ethylene glycol meeting ASTM D6210; 50/50 water/ethylene glycol (protection to -37 C); 60/40 in warmer/sea water environments | — | |||
| Oil | 12.6 L | — | 350 hr |
Service intervals
23| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Engine Oil Level | Check | 8 hr | Before first start of day and after every 8 hours of operation | |
| Exhaust system | Inspect | 8 hr | Inspect for exhaust leaks at every startup and after every eight hours of operation | |
| General Inspection | Inspect | 8 hr | Before first start of day and after every 8 hours of operation; includes oil level, coolant level, fuel system, exhaust system, batteries | |
| General Inspection (Oil Level, Coolant Level, Fuel System, Exhaust System, Battery, Sea Water Strainer) | Check | 8 hr | Every day, all models (MDKBH, MDKBJ, MDKBW, MDKB & MDKD, MDDCX) | |
| Battery | Check | 100 hr | 1 mo | Monthly, 100 Hrs, all models; see battery manufacturer recommendations |
| Brushes & Slip Rings | Check | 200 hr | Yearly, 200 Hrs (MDKBH, MDKBJ, MDKBW only); must be performed by trained mechanic; not applicable to other listed models (—) | |
| Oil and Filter | Change | 350 hr | First service — Change oil and filter after first 50 hours, then at scheduled intervals | |
| Serpentine Belt and Tensioner | Inspect | 350 hr | Check for slippage, cracking, and wear | |
| Pump Impeller | Replace | 500 hr | Yearly, 500 Hrs, all models | |
| Air Filter | Check | 700 hr | Yearly, 700 Hrs (MDDCX only) | |
| Air Filter | Inspect | 700 hr | Clean and oil if restriction is greater than 25 inches (635 mm) WC | |
| CCV Filter | Replace | 700 hr | Shut down engine for 2 minutes every 24 hours to allow auto drainage of crankcase oil | |
| Fuel Filters | Change | 700 hr | ||
| Zinc Anode | Inspect | 700 hr | ||
| Raw Water Pump Impeller | Replace | 1050 hr | Replace every 1050 hours | |
| Generator Bearing(s) & Drive Belt | Change | 2000 hr | 60 mo | 5 Yrs, 2000 Hrs, all models; must be performed by a trained and experienced mechanic |
| Fuel Injectors | Replace | 2100 hr | Must be performed by a qualified mechanic (authorized Cummins Onan Dealer) | |
| Valve Lash | Adjust | 2100 hr | Must be performed by a qualified mechanic (authorized Cummins Onan Dealer) | |
| Battery and Battery Connections | Check | 1 mo | See battery manufacturer's recommendations | |
| Coolant, Pressure Cap & Thermostat | Change | 24 mo | 2 Yrs, all models | |
| Coolant, Pressure Cap, and Thermostat | Replace | 24 mo | Replace every 2 years | |
| Generator Bearing | Inspect | 60 mo | Replace every 5 years; must be performed by a qualified mechanic | |
| Oil / Oil Filter | Change | First service — First 50 Hrs - Yearly, 200 Hrs (MDKBH, MDKBJ, MDKBW, MDKB & MDKD Models K,L,M,N,P,R,V); First 50 Hrs - Yearly, 350 Hrs (MDKB & MDKD Models S,T,U; MDDCX) |
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
60| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Clearance - air inlet and outlet openings | 127 | mm | 5 inches |
| Clearance | Clearance - engine end (serpentine belt replacement) | 305 | mm | 12 inches |
| Clearance | Clearance - non-service sides | 50 | mm | 2 inches |
| Clearance | Exhaust piping clearance from combustible construction | 229 | mm | 9 inches |
| Clearance | Siphon break above highest marked water line (min) | 152 | mm | 6 inches |
| Other | 10% Overload Engine Power | 107 hp (80 kW) | ||
| Other | 10% Overload Engine Power | 131 hp (98 kW) | 50 Hz | |
| Other | 10% Overload Engine Power | 162 hp (121 kW) | ||
| Other | 10% Overload Engine Power | 82 hp (61 kW) | 50 Hz | |
| Other | Battery Charging Output - Iso Gnd | 12V - 70 Amps / 24V - 45 Amps | ||
| Other | Battery Charging Output - Neg Gnd | 12V - 60 Amps / 24V - 40 Amps | ||
| Other | Compression Ratio | 17.0 : 1 | 6-cylinder | |
| Other | Compression Ratio | 17.6 : 1 | 4-cylinder | |
| Other | Coolant Flow Rate | 14 gal/min (53 L/min) | 50 Hz | |
| Other | Coolant Flow Rate | 25 gal/min (94 L/min) | ||
| Other | Coolant Flow Rate | 31 gal/min (116 L/min) | 50 Hz | |
| Other | Coolant Flow Rate | 33 gal/min (125 L/min) | ||
| Other | Coolant flow rate | 53 | L/min | 50 Hz ratings |
| Other | Coolant flow rate | 94 | L/min | 60 Hz ratings |
| Other | Coolant flow rate (50 Hz ratings) | 53 | L/min | 50 Hz ratings |
| Other | Coolant flow rate (60 Hz ratings) | 94 | L/min | 60 Hz ratings |
| Other | Displacement | 275 in3 (4.5 L) | 4-cylinder | |
| Other | Displacement | 415 in3 (6.8 L) | 6-cylinder | |
| Other | Exhaust Gas Flow | 463 ft3/min (13.1 m3/min) | ||
| Other | Exhaust Gas Flow | 848 ft3/min (24 m3/min) | ||
| Other | Exhaust hose/pipe slope (min, without sagging) | 1/2 inch per foot (42 mm/meter) | ||
| Other | Frequency Regulation | Isochronous | ||
| Other | Fuel Supply and Return Connection Size | 1/4 - 18 NPTF | ||
| Other | Heat Rejection to Coolant | 2681 Btu/min (47 kW) | 50 Hz | |
| Other | Heat Rejection to Coolant | 3523 Btu/min (62 kW) | ||
| Other | Heat Rejection to Coolant | 4554 Btu/min (80 kW) | 50 Hz | |
| Other | Heat Rejection to Coolant | 5863 Btu/min (103 kW) | ||
| Other | Lube Oil Drain Connection | 3/8 inch NPT | ||
| Other | Max fuel lift | 3 | m | |
| Other | Maximum Angularity, any direction | 30 | Degrees | |
| Other | Maximum Fuel Height above Inj. Pump | 10 | ft | |
| Other | Maximum Leak-off Return Height | 8 | ft | |
| Other | Maximum Pump Suction Lift | 10 | ft | |
| Other | Minimum Required Fuel Line ID | 0.25 | inch | |
| Other | Raw Water Inlet Connection Size (OD) | 1.25 | in | |
| Other | Recommended Battery Capacity @ 32 F (0 C) | 12V - 640 CCA / 24V - 570 CCA | ||
| Other | Recommended Battery Capacity @ 32 F (0 C) | 12V - 800 CCA / 24V - 570 CCA | ||
| Other | Sea Water Pump Flow | 18 gal/min (70 L/min) | 50 Hz | |
| Other | Sea Water Pump Flow | 22 gal/min (84 L/min) | ||
| Other | Starter Rolling Current @ 32 F (0 C) | 12V - 780 Amps / 24V - 600 Amps | ||
| Other | Starter Rolling Current @ 32 F (0 C) | 12V - 920 Amps / 24V - 600 Amps | ||
| Other | Total Fuel Flow | 29 gal/hr (109 L/hr) | ||
| Other | Total Fuel Flow | 30 gal/hr (113 L/hr) | ||
| Pressure | Engine oil pressure (low - fault SPN 100 FMI 1) | 24 to 51 | psi (165 to 350 kPa) | depending on engine speed |
| Pressure | Max. Fuel transfer suction with Auxiliary Pump | 18 | in Hg | |
| Pressure | Max. Pressure Drop Across Keel Cooler | 3 | psi | |
| Pressure | Max. Pressure Drop Across Keel Cooler | 4 | psi | |
| Pressure | Maximum Air Intake Restriction - Clean Element | 12 | inches H20 | |
| Pressure | Maximum Air Intake Restriction - Dirty Element | 25 | inches H20 | |
| Pressure | Maximum Back Pressure | 30 | inches H20 | |
| Pressure | Maximum Exhaust Back Pressure | 2.2 | in Hg | |
| Pressure | Maximum Fuel Return Pressure (Restriction) | 3 | psi | |
| Pressure | Maximum Fuel transfer pump suction | 8 | in Hg | |
| Pressure | Maximum Leak-off Line Pressure | 3 | psi | |
| Pressure | Maximum Outlet Pressure | 20 | psi |
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 | Fleetguard - ES Compleat and EG Premix | Ethylene glycol based coolant (also known as summer coolant, coolant additive). | |||
| Coolant | 50/50 mixture water/ethylene glycol (protection to -37 C); 60/40 recommended in warmer climates and sea water environments | ASTM D6210 | Capacity 14 L (15 qt) for 4-cylinder models; 30 L (32 qt) for 6-cylinder models | ||
| Coolant | 50/50 water/ethylene glycol | 2.1 L | MDKBH; also stated as 2.2 Qt | ||
| Engine oil | 15W40 | Premium Blue E 15W40 | Lubricant oil; used in engine lubricant oil systems, sump pan and filters. | ||
| Engine oil | SAE 15W-40 (multi-grade recommended year round); choose viscosity per ambient temperature | API CF, CF-4, CG-4, CH-4, or CI-4 (break-in: API CE, CD, or CC) | Capacity 12.6 L (13.3 qt) for 4-cylinder models; 19.4 L (20.5 qt) for 6-cylinder models | ||
| Fuel | ASTM D975 | Bio-diesel meeting ASTM D6751 or EN14214, blended with ASTM D975 diesel up to B20. Bio-diesel compatible fuel water separator required. | |||
| Fuel | Grade 2-D diesel fuel (Grade 1-D where ambient below 5 C/40 F); cetane not less than 45; sulfur not more than 0.5% by weight | EN 590 or ASTM D975; lubricity per ASTM D6078 (min 3100 g) or ASTM D6079/ISO 12156-1 (max scar 0.45 mm) | B5 bio-diesel suitable; B5-B20 per model Spec C compatibility; bio-diesel meeting ASTM D6751 or EN14214 | ||
| Fuel | No. 2 Diesel | EN 590 or ASTM D975 |
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
65| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 1 | One blink | Shutdown due to high engine temperature | Shutdown | |
| 12 | High AC Voltage | Output voltage jumped to more than 125% of rated for 75 ms or more than 115% of rated for 3 seconds | Shutdown | Does not apply with PMG excitation; check/reset circuit breaker and run fewer loads; check fuel fittings/filters; prime fuel system; isolate external circuits |
| 13 | Low AC Voltage | Output voltage fell to less than 90% of rated for 5 seconds | Shutdown | Does not apply with PMG excitation; disconnect PTO and reduce loads; check fuel level; remove blockages; prime fuel system; check fuel fittings; replace fuel filters |
| 14 | High AC Frequency | Frequency jumped to more than 70 Hz for 40 ms or more than 2% over nominal for 6 seconds | Shutdown | Check/reset circuit breaker and run fewer loads; check fuel fittings and filters for leaks |
| 15 | Low AC Frequency | Frequency fell to less than 90% of nominal for more than 8 seconds | Shutdown | Disconnect PTO and reduce loads; check fuel level; remove blockages; prime fuel system; check fuel fittings; replace fuel filters; check air filter |
| 16 | Engine Fault | The e-Series Digital Display will display this if the auxiliary engine shutdown device causes shutdown | Shutdown | See the Operator Manual. |
| 2 | Two blinks | Shutdown due to low oil pressure | Shutdown | |
| 27 | Loss of AC Voltage Sense | Controller lost VAC sensing during normal voltage regulation | Shutdown | See an authorized Cummins Onan Service Representative |
| 29 | High Battery Voltage | Battery voltage greater than 19.2 V (12 VDC system) or 32.2 V (24 V system) | Shutdown | Check battery bank connections; select lower battery booster charge rate |
| 3 | Three blinks | Shutdown that may require service | Warning | See Troubleshooting in the Operator's Manual |
| 32 | Starting Fault | Controller could not detect cranking speed for 3 seconds | Shutdown | Disconnect PTO; have propulsion engines running; service battery; change engine oil viscosity |
| 35 | Control Card Failure - EE | Controller detected an EE memory error | Shutdown | See an authorized Cummins Onan Service Representative |
| 36 | Unknown Shutdown | Engine speed fell below 1000 RPM for 0.5 seconds | Shutdown | Check for mechanical damage; reduce loads; check fuel; prime fuel system; remove blockages; check fuel fittings; replace fuel filters; check air filter |
| 37 | Invalid Generator Set Configuration | Controller not configured properly for the generator set | Shutdown | See an authorized Cummins Onan service representative |
| 4 | Overcrank | Shutdown due to a failure to start within the time allowed for cranking | Shutdown | Disconnect PTO; check fuel level; open fuel valves; prime fuel system; service battery; remove air/exhaust blockages; replace fuel filters; check air filter; change engine oil viscosity |
| 43 | Control Card Failure - RAM | Controller detected a RAM memory error | Shutdown | See an authorized Cummins Onan Service Representative |
| 45 | Speed Sense Lost | After start disconnect controller lost speed sense for 0.25 seconds | Shutdown | See an authorized Cummins Onan Service Representative |
| 46 | Generator Set Overload | Engine load exceeded 135 percent of rating for 10 seconds | Shutdown | Reduce the number of electrical and mechanical (PTO) loads |
| 5 | Warning Shutdown due to CO | The e-Series Digital Display will display this if the CO detector causes shutdown | Shutdown | See the Operator Manual. |
| 57 | Overprime | A local or remote control switch was held in the prime position for more than 5 minutes | Warning | Remove any object holding a control switch in the prime position |
| 58 | High Exhaust Temperature | The genset will shut down if exhaust temperature becomes too high | Shutdown | Open sea cock; check hoses; clean sea water strainer; inspect siphon break; check raw water impeller; clean heat exchanger |
| 59 | Low Coolant Level | Engine coolant level fell below the optional coolant level sensor | Shutdown | Add coolant as necessary and repair leaks |
| 6 | Oil Level High or Low | Engine oil level is too low or too high | Shutdown | Add or drain oil; check for leaks; contact authorized service rep if oil contains water/coolant |
| 61 | External Shutdown | The e-Series Digital Display will display this if the external stop device causes shutdown | Shutdown | See the Operator Manual. |
| 7 | Seven blinks | The genset will shut down if water stops flowing | Shutdown | Open sea cock; clean sea water strainer; check hoses; check raw water impeller; check hull through-fitting |
| 72 | Lost NIM Communications | Controller lost communication with the NIM for 15 seconds | Shutdown | See an authorized Cummins Onan service representative |
| SPN: 1, FMI: 0 | Engine Fault, Above Normal | Engine controller not in communication with NIM | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 100, FMI: 1 | Engine Oil Pressure, Below Normal | Engine oil pressure below 24 to 51 psi (165 to 350 kPa) depending on engine speed | Shutdown | Check engine oil level and add or drain as necessary; repair oil leaks |
| SPN: 100, FMI: 18 | Engine Oil Pressure, Below Normal | Engine oil pressure below 165 to 350 kPa (24 to 51 PSI) depending on engine speed | Warning | Check engine oil level and add or drain as necessary; repair oil leaks |
| SPN: 100, FMI: 3 | Engine Oil Pressure, Voltage Out of Range | Sensor or wiring is shorted or open | Warning | See an authorized Cummins Onan service representative |
| SPN: 100, FMI: 4 | Engine Oil Pressure, Volt. Out/Range | Engine oil pressure sensor or wiring is open or grounded | Warning | See an authorized Cummins Onan service representative |
| SPN: 105, FMI: 16 | Intake Manifold Temperature, Above Normal | Intake manifold temperature is above 150 C (302 F) | Warning | See an authorized Cummins Onan service representative |
| SPN: 105, FMI: 3 | Intake Manifold Temperature, Volt. Out/Range | Sensor or wiring is shorted or open | Warning | See an authorized Cummins Onan service representative |
| SPN: 1076, FMI: 0 | Fuel Injection Pump Valve, Above Normal | Closure too long | Warning | See an authorized Cummins Onan service representative |
| SPN: 1076, FMI: 1 | Fuel Injection Pump Valve, Above Normal | Closure too short | Warning | See an authorized Cummins Onan service representative |
| SPN: 1076, FMI: 10 | Fuel Injection Pump Valve, Abnormal Rt/Chg | Fuel injection pump fuel control valve circuit resistance | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1076, FMI: 13 | Fuel Injection Pump Valve, Out of Calib. | Fuel injection pump fuel control valve circuit resistance due to connector | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1076, FMI: 3 | Fuel Injection Pump Valve, Volt. Out/Range | Sensor or wiring shorted or open | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1076, FMI: 5 | Fuel Injection Pump Valve, Cur. Out/Range | Fuel injection pump fuel control valve open | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1076, FMI: 6 | Fuel Injection Pump Valve, Cur. Out/Range | Fuel injection pump fuel control valve open or grounded | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1076, FMI: 7 | Fuel Injection Pump Valve, Above Normal | ECU failed to detect closure | Warning | See an authorized Cummins Onan service representative |
| SPN: 110, FMI: 0 | Engine Coolant Temperature, Above Normal | Engine coolant temperature above 244 F (118 C) | Shutdown | Clean sea water strainer; check coolant level; check hoses; inspect siphon break; check raw water impeller; check hull through-fitting |
| SPN: 110, FMI: 15 | Engine Coolant Temperature, Above Normal | Engine coolant temperature above 226 F (108 C) | Warning | Clean sea water strainer; check coolant level; check hoses; inspect siphon break; check raw water impeller; check hull through-fitting |
| SPN: 110, FMI: 16 | Engine Coolant Temperature, Above Normal | Engine coolant temperature above 235 F (113 C) | Warning | Clean sea water strainer; check coolant level; check hoses; inspect siphon break; check raw water impeller; check hull through-fitting |
| SPN: 110, FMI: 3 | Engine Coolant Temperature, Volt. Out/Range | Sensor or wiring is shorted or open | Warning | See an authorized Cummins Onan service representative |
| SPN: 110, FMI: 4 | Engine Coolant Temperature, Volt. Out/Range | Sensor or wiring is shorted to ground | Warning | See an authorized Cummins Onan service representative |
| SPN: 1109, FMI: 31 | Approaching Shutdown | Engine controller protection circuit approaching shutdown (30 seconds) | Warning | See an authorized Cummins Onan Service Representative |
| SPN: 1110, FMI: 31 | Engine Has Shut Down | Engine controller protection circuit has shut down | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 1569, FMI: 31 | Engine Torque Derate | A derate condition exists - check coolant temperature, oil pressure, fuel temperature | Warning | See an authorized Cummins Onan Service Representative |
| SPN: 158, FMI: 17 | Battery Potential, Below Normal | ECU cannot power down | Warning | See an authorized Cummins Onan service representative |
| SPN: 174, FMI: 16 | Fuel Temperature, Above Normal | Return fuel temperature above 248 F (120 C) | Warning | See an authorized Cummins Onan service representative |
| SPN: 174, FMI: 3 | Fuel Temperature, Volt. Out/Range | Sensor or wiring shorted or open | Warning | See an authorized Cummins Onan service representative |
| SPN: 174, FMI: 4 | Fuel Temperature, Volt. Out/Range | Sensor or wiring shorted or open | Warning | See an authorized Cummins Onan service representative |
| SPN: 190, FMI: 0 | Engine Speed, Above Normal | Engine speed exceeded 3400 rpm | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 190, FMI: 16 | Engine Speed, Above Normal | Engine speed exceeded 3000 rpm | Warning | See an authorized Cummins Onan service representative |
| SPN: 2000, FMI: 06 | ECU Failure, Cur. Out/Range | ECU failure | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 620, FMI: 3 | 5 Volts DC Supply, Volt. Out/Range | 5 V supply shorted to battery voltage | Warning | See an authorized Cummins Onan service representative |
| SPN: 620, FMI: 4 | 5 Volts DC Supply, Volt. Out/Range | 5 V supply shorted to ground | Warning | See an authorized Cummins Onan service representative |
| SPN: 629, FMI: 13 | Controller #1, Out of Calib. | The engine controller requires recalibration | Shutdown | See an authorized Cummins Onan Service Representative |
| SPN: 637, FMI: 10 | Timing (Crank) Sensor, Abnormal Rt/Chg. | Improper signal pattern | Warning | See an authorized Cummins Onan service representative |
| SPN: 637, FMI: 2 | Timing (Crank) Sensor, Data Erratic | Excessive signal noise | Warning | See an authorized Cummins Onan service representative |
| SPN: 97, FMI: 0 | Water In Fuel Indicator, Above Normal | Water is present in the fuel separator | Shutdown | Drain the water from the fuel separator |
| SPN: 97, FMI: 16 | Water In Fuel Indicator, Above Normal | Water is present in the fuel separator | Warning | Drain the water from the fuel separator |
| SPN: 970, FMI: 31 | Auxiliary Engine Shutdown Switch | An external controller sent a shutdown signal to the engine controller | Shutdown | Investigate cause of shutdown; make necessary repairs; reset the external controller |
| SPN: 971, FMI: 31 | Engine Derate Switch | An external derate input has been activated | Warning | See an authorized Cummins Onan service representative |
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 AC Output Voltage (Non-PMG) Using Control Switch adjustment
- Start genset, let voltage and frequency stabilize 5 to 10 seconds; disconnect all loads.
- Rapidly press START 6 times during the first minute to enter voltage adjust mode; amber lamp blinks.
- Press and quickly release START to raise voltage about 0.6 volts.
- Press and hold START about 2 seconds to lower voltage about 0.6 volts.
- Wait about 20 seconds for the amber lamp to stop blinking, then press STOP to save.
- Restart the genset and check voltage.
Adjusting AC Output Voltage (Non-PMG) Using Digital Display adjustment
Tools: Separate voltmeter
- Start genset, let voltage and frequency stabilize 5 to 10 seconds; disconnect all loads.
- Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
- Press and quickly release START to raise voltage about 0.6 volts per press.
- Press and hold START about 1 second to lower voltage about 0.6 volts per press.
- Wait about 20 seconds for display to return to Running, then press STOP to save.
- Restart the genset and check voltage.
Adjusting PMG Excited Generator Voltage Using Voltage Regulator Trimmer adjustment
Tools: Small flat-bladed screwdriver
- If the generator set has a sound shield enclosure, remove the front access panel below the control box.
- Remove the voltage regulator access cover.
- Push the SINGLE (PARALLEL) operation switch up to SINGLE.
- Start the generator set and let voltage and frequency stabilize; disconnect all loads.
- Using a small flat-bladed screwdriver, turn the voltage trimmer clockwise to increase voltage or counterclockwise to decrease voltage.
Adjusting Quad Winding Generator Voltage Using Control Switch adjustment
- Start the generator set and let voltage and frequency stabilize for 5 to 10 seconds; disconnect all loads.
- Rapidly press START 6 times during the first minute after start up to enter voltage adjust mode.
- To adjust voltage up, press and quickly release START (approx. 0.6 volts per press).
- To adjust voltage down, press and hold START for about 1 second.
- Wait about 20 seconds for the amber lamp to stop blinking, then press STOP to save.
- Restart the generator set and check voltage.
Adjusting Quad Winding Generator Voltage Using Digital Display adjustment
⚠ Hazardous Voltage! Touching uninsulated live parts can result in severe personal injury or death.
- Start the generator set and let voltage and frequency stabilize for 5 to 10 seconds; disconnect all loads.
- Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
- To adjust voltage up, press and quickly release START (approx. 0.6 volts per press).
- To adjust voltage down, press and hold START for about 1 second.
- Wait about 20 seconds for status change from Volt Adj to Running, then press STOP to save.
- Restart the generator set and check voltage.
- Recalibrate AC voltage on the digital display as instructed in the Operator Manual.
Adjusting Reactive Droop Compensation adjustment
- Check for correct droop CT connections and polarity, especially if the generator has been reconnected.
- Adjust voltage in accordance with the preceding procedure.
- Push the SINGLE (PARALLEL) operation switch down to PARALLEL.
- Start the generator set and connect at least 1/2 rated load.
- Measure voltage at the voltage regulator terminals to which the droop CT leads are connected; expect less than 5 VAC.
- Multiply the reciprocal of the measured voltage by 100 to get percentage of full rotation required of the droop trimmer.
- Turn the voltage droop trimmer fully counterclockwise to zero, then clockwise the approximate percentage of full rotation.
Adjusting Voltage (PMG Excited Alternators) adjustment
⚠ Hazardous voltage - touching uninsulated live parts can cause severe personal injury or death
Tools: Small flat-bladed screwdriver
- If fitted with a sound shield enclosure, remove the front access panel below the control box.
- Remove the voltage regulator access cover.
- Push the Single/Parallel Operation Switch up to SINGLE.
- Start the genset, let voltage and frequency stabilize and disconnect all loads.
- Turn the Voltage Trimmer clockwise to increase or counterclockwise to decrease voltage.
Changing the Wet Exhaust Elbow Orientation adjustment
- Remove the formed raw water hose.
- Loosen the support bracket.
- Turn the elbow in the desired direction.
- Retighten the bracket screw.
- Select and install the proper formed hose from among the three provided.
- Discard the unused hoses.
Exhaust Water Separator Backflow Test diagnostic
⚠ Backflow can cause major engine damage if the cylinders become flooded.
- Prepare by closing the drain hose sea cock and disconnecting the hose from the water separator.
- Open the sea cock while keeping the hose raised to its fitting on the water separator.
- Operate the boat throughout its speed range and verify there is no backflow.
Raw Water Pickup Test diagnostic
- Close the sea cock and disconnect the raw water pickup hose from the generator set. Alternatively, connect a clear plastic hose to the strainer or sea cock.
- Raise the end of the hose above expected water level and open the sea cock. Mark the water line on the generator set or enclosure while docked.
- Operate the boat through its speed range in forward and reverse; have someone monitor and mark the highest water level.
Changing Wet Exhaust Elbow Orientation installation
- Remove the formed raw water hose.
- Loosen the support bracket.
- Turn the elbow to point 45 degrees forward or 45 degrees rearward.
- Retighten the support bracket screw.
- Install the proper formed hose from among the three provided and discard the unused hoses.
Connecting Battery Cables installation
⚠ Sparks can ignite fuel leading to severe personal injury or death. Do not run battery cables and fuel lines together.
Tools: Insulated wrench
- Bolt the cables to the engine starter solenoid and engine block using an insulated wrench.
- Provide an insulating boot for the positive (+) terminal to protect against accidental contact.
- Route battery cables through holes in the sides and bottom of the base.
- Use the rubber grommets provided to protect the cables from chaffing and seal noise.
- Make sure all unused hose and cable entrance/exit holes around the base are capped or sealed.
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 |
|---|---|---|---|---|
| 220/208 | 3 | 12 Lead Reconnectable | Applies to MDKDP (60 Hz), MDKDR (60 Hz), MDKDS | |
| 220/380 | 3 | 12 Lead Reconnectable | Applies to MDKDP, MDKDR, MDKDT, MDKDU | |
| 3-phase | 3 | 12 Lead Reconnectable | Applies to MDDCW, MDDCU, MDDCY, MDDCS, MDDCT |
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 size generator is the Cummins/Onan MDDC?
The Cummins/Onan MDDC is rated 40 kW standby (40.0 kVA).
What engine does the Cummins/Onan MDDC use?
The Cummins/Onan MDDC is powered by the John Deere 4045TFM engine.
What fuel does the Cummins/Onan MDDC use?
The Cummins/Onan MDDC runs on diesel.
How much oil does the Cummins/Onan MDDC take?
The John Deere 4045TFM engine in the Cummins/Onan MDDC has an oil capacity of 12.6 liters.
What is the cooling system capacity of the Cummins/Onan MDDC?
The Cummins/Onan MDDC cooling system holds 14 liters (3.7 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
How loud is the Cummins/Onan MDDC?
The Cummins/Onan MDDC is rated at 72.0 dBA at 1 m, per the manufacturer specification sheet.
How much does the Cummins/Onan MDDC weigh?
The Cummins/Onan MDDC has a dry weight of 1320 kg (2910 lb).
What voltage does the Cummins/Onan MDDC produce?
The Cummins/Onan MDDC is offered in 120/240 V, 12 V, 1-phase.
How many cold cranking amps does the Cummins/Onan MDDC require?
The Cummins/Onan MDDC uses 12/24 VDC V each, 640 Amps (12 VDC) / 570 Amps (24 VDC) CCA, per the manufacturer specification sheet.
What alternator comes on the Cummins/Onan MDDC?
The Cummins/Onan MDDC uses a Single Bearing, 4-Pole Rotating Field, Brushless alternator. It has 4 poles.
Which oil filter part number does the Cummins/Onan MDDC take?
The Cummins/Onan MDDC uses oil filter part number 185-7444.
Which fuel filter part number does the Cummins/Onan MDDC take?
The Cummins/Onan MDDC uses fuel filter part number 149-2106.
What air filter does the Cummins/Onan MDDC use?
The Cummins/Onan MDDC uses air filter part number 140-3752.
Troubleshooting
6Fault codes
| Code | Meaning | Cause |
|---|---|---|
| No. 16 | Engine Pre-Alarms | |
| Code No. 3 | Service Check | |
| Code No. 16 | Engine Fault | Above Normal |
| SPN: 97, FMI: 0 | Water In Fuel Indicator, Above Normal | |
| SPN: 100, FMI: 1 | Engine Oil Pressure, Below Normal |
Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Exhaust leaks | Inspect for exhaust leaks at every startup and after every eight hours of operation. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan MDDC troubleshooting guide (26 entries) →
Repair guides
18- Adjusting AC Output Voltage (Non-PMG) Using Control Switch
- Adjusting AC Output Voltage (Non-PMG) Using Digital Display
- Adjusting PMG Excited Generator Voltage Using Voltage Regulator Trimmer
- Adjusting Quad Winding Generator Voltage Using Control Switch
- Adjusting Quad Winding Generator Voltage Using Digital Display
- Adjusting Reactive Droop Compensation
- Adjusting Voltage (PMG Excited Alternators)
- Changing the Wet Exhaust Elbow Orientation
- Changing Wet Exhaust Elbow Orientation
- Connecting Battery Cables
- Draining the Fuel Filter
- Removing and Installing the Heat Exchanger
- Replacing Fuel Filter
- Replacing Raw Water Pump Impeller
- Replacing the CCV Filter Element
- Replacing the Serpentine Belt
- Replacing the Thermostats
- Returning the Generator Set to Service
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
34| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 122-0810 | Oil Filter | 1 | Oil filter | Amazon eBay $12.39 NAPA $3.59 |
| 122-0885 | Oil Filter | Oil filter | eBay | |
| 122-0906 | Oil Filter | Oil filter | eBay $57.78 | |
| 132-0436 | Pump Impeller | Impeller | eBay | |
| 132-0493 | Pump Impeller | Impeller | eBay | |
| 140-3752 | Air Filter | Air filter | Amazon eBay $49.95 | |
| 149-2106 | Fuel Filter | 1 | Fuel filter | Amazon eBay $34.99 NAPA $61.61 KuduParts $68.00 |
| 149-2804 | Fuel Filter | Fuel filter | eBay $50.19 | |
| 185-5421 | Plug, Glow | 2 | Glow plug | Amazon eBay $35.00 |
| 185-5835 | Oil Filter | 1 | Oil filter | Amazon eBay $21.78 NAPA $3.59 FridayParts $20.19 |
| 185-5990 | Glow Plug (12 Volt) | 1 | Glow plug | Amazon eBay $55.74 |
| 185-6725 | 24V Glow Plugs | 1 | Glow plug | Amazon eBay |
| 185-6934 | V-Belt | 1 | Belt | Amazon eBay $70.52 |
| 185-7107 | 24V Glow Plugs | 3 | Glow plug | Amazon eBay |
| 185-7444 | Filter, Oil | 1 | Oil filter | Amazon eBay $29.95 NAPA $9.09 KuduParts $11.00 FridayParts $13.23 |
| 333-0745 | 12V Glow Plugs | Glow plug | eBay | |
| 333-0746 | 24V Glow Plugs | Glow plug | eBay | |
| 333-0802 | 12V Glow Plugs | Glow plug | Amazon eBay $20.00 | |
| 511-0197 | V-Belt | Belt | Amazon eBay | |
| 511-0206 | V-Belt | Belt | eBay | |
| 511-0215 | V-Belt | Belt | eBay | |
| 511-0237 | V-Belt | Belt | eBay | |
| 541-1316 | Pump Impeller | Impeller | eBay $33.00 | |
| 541-1519 | Pump Impeller | Impeller | eBay $94.41 | |
| 541-1521 | Pump Impeller | Impeller | eBay $120.00 FridayParts $27.23 | |
| 541-1524 | Pump Impeller | Impeller | eBay $122.63 | |
| A026K278 | Fuel Filter | Fuel filter | eBay $99.53 KuduParts $93.00 FridayParts $95.00 | |
| F1379 | Siphon Break Kit | Siphon break | Amazon eBay | |
| 10-2013 | Exhaust System Illustration | Service part / kit | Amazon eBay | |
| 123-2246 | Crankcase Breather | Service part / kit | eBay | |
| 123-2327 | Crankcase Breather | Service part / kit | eBay | |
| 130-4434 | Zinc Pencil | 1 | Service part / kit | Amazon eBay $34.17 NAPA $23.21 |
| 130-6228 | Zinc Pencil (Zinc Anode) | Service part / kit | eBay $34.95 | |
| 185-6721 | Element, Breather | 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 |
|---|---|---|---|
| 50% | 7.2 | 1.9 | |
| 100% | 12.9 | 3.4 | |
| Continuous | 25% | 0.8 | 0.3 |
| Continuous | 50% | 1.0 | 0.3 |
| Continuous | 75% | 1.3 | 0.4 |
| Continuous | 100% | 1.7 | 0.4 |
Available documents
Spec sheet — 0042670 (Cummins/Onan)Spec sheet — 0058498 (Cummins/Onan)Spec sheet — F-1487K Cummins-Onan Marine Generators Pocket Guide (09-2012) (Cummins/Onan)Operator's manual — F-1576 (Cummins/Onan)Reference — 0059599 (Cummins/Onan)Owner's manual — 981-0172 Onan MDDCA thru MDDCR Operator's Manual (3-2013) (Cummins/Onan)Parts manual — F-1379-ENService manual — 981-0639 Onan MDDCA thru MDDCR Installation Manual (10-2013) (Cummins/Onan)Service manual — 981-0639 Onan MDDCA thru MDDCR Installation Manual (11-2004) (Cummins/Onan)
This page was generated from the 9 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.