HomeCummins/OnanCummins/Onan DFM Series 60Hz

Cummins/Onan DFM Series 60Hz Generator Set

The Cummins/Onan DFM Series 60Hz is a 250 kW (312.5 kVA) Diesel standby generator set powered by a Cummins/Onan NTA855-G engine. It is available at 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V and 277/480 V, 3-phase, 60 Hz and rated 867 A. It holds about 40 L (10.6 gal) of oil and 55 L (14.5 gal) of coolant. Starting uses 2 group-8 batteries rated 225 CCA at 24 V. The set measures 2896×1118×1829 mm (114.0×44.0×72.0 in) and weighs about 2867 kg (6321 lb).

250 kW
Standby
14.0 L
Displacement
40.0 L
Oil capacity
0
Document types

How to read your Cummins/Onan serial & model number →

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power250 kW
Standby kVA312
ControllerYB Type
Oil capacity40.0 L
AlternatorCummins/Onan YB (4-pole)
Voltage options120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 277/480 V
Phase3
Rated current867 A
Power factor0.8
Battery group8D
Battery cranking225 CCA
Battery voltage24 V
Battery quantity2
Coolant capacity55 L
Dimensions (L×W×H)2896×1118×1829 mm
Dry weight2867 kg

Engine

Cummins/Onan NTA855-G
Oil capacity40.0 L
Coolant capacity55.0 L
Displacement14.0 L
AspirationTurbocharged
Rated speed1800 rpm

Maintenance & consumables

for the Cummins/Onan NTA855-G
ItemSpecCapacityPart #Interval
Air filter500 hr find
Fuel filter500 hr find
Oil filter500 hr find
Belt find
Coolant55.0 liters2000 hr
OilASTM D240.0 liters500 hr

Common questions

What is the power rating of the Cummins/Onan DFM Series 60Hz?

The Cummins/Onan DFM Series 60Hz is rated 250 kW standby (312.5 kVA).

What engine does the Cummins/Onan DFM Series 60Hz use?

The Cummins/Onan DFM Series 60Hz is powered by the Cummins/Onan NTA855-G engine.

What fuel does the Cummins/Onan DFM Series 60Hz use?

The Cummins/Onan DFM Series 60Hz runs on Diesel.

What is the oil capacity of the Cummins/Onan DFM Series 60Hz?

The Cummins/Onan NTA855-G engine in the Cummins/Onan DFM Series 60Hz has an oil capacity of 40.0 liters.

What alternator does the Cummins/Onan DFM Series 60Hz use?

The Cummins/Onan DFM Series 60Hz uses a Cummins/Onan YB alternator. It has 4 poles.

Troubleshooting

14

Fault codes

CodeMeaningRemedy
*Low oil pressure shutdownLow oil pressure shutdown.A. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
*High engine temperature shutdownHigh engine temperature shutdown.A. Coolant level. Replenish if necessary. b. City water cooled sets. Check water flow, valves, etc. c. Check sensor; check thermostat. d. Radiator model, check fan belts, radiator for obstructions, etc.
Overspeed shutdownOverspeed shutdown.Check governor and throttle linkages for freedom of movement. Check overspeed switch.
Overspeed light on, no shutdownOverspeed light on, no shutdown.Disconnect wire at TB11-29. Light on after reset; replace engine monitor board.
*Low oil pressure light ON. No shutdownLow oil pressure light ON. No shutdown.Disconnect wire at TB11-30. Light ON after relay reset. Replace engine monitor board.
*High engine temperature light ON. No shutdownHigh engine temperature light ON. No shutdown.Disconnect wire at TB11-31. Light ON after relay reset. Replace engine monitor board.

Symptoms & remedies

SymptomRemedy
Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds.See engine service manual for troubleshooting fuel system. After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, then back to the required running position.
Fault lamp lights immediately after engine starts.Check for: Overspeed condition as engine starts.
Fault lamp lights and engine shuts down after running for a period.A. Oil level. Engine will shut down if sensor is closed. b. Check engine manual for troubleshooting oil system. c. High engine temperature. Check coolant level; check water flow (city water cooled systems); check radiator for free air flow, and fan belts for tightness. See engine manual for troubleshooting cooling system. d. Check for faulty oil pressure sensor or faulty high engine temperature sensor.
Engine runs, shuts down and cranks for 75-seconds. Cranking cycle stops; fault lamp lights.Check fuel supply.
Fault lamp lights, no fault exists.To check a no-fault condition, disconnect leads from TBl terminals 29, 30 and 31. If fault lamp lights with leads disconnected, replace engine monitor board. Reconnect leads.
Overcrank fault lamp lights and engine stops cranking after approximately 75-seconds.See engine service manual for troubleshooting fuel system. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, overcrank light ON.Check fuel supply.
Engine fails to start, or starts and runs then stops and fault lamp lightsRefer to appropriate troubleshooting chart, Table 3 or Table 4

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

2
Part #DescriptionQtySystem
140-1346Air Cleaner Assembly1Air filter PartsGeek
100-1359Engine, Replacement (Cummins NTA855G)1Service 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

RatingLoadL/hgal/h
Standby100%18.4

Available documents

Other sets with this engine