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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 →

Typical fuel consumption for 250–255 kW Diesel generators →

Compare with other 250–255 kW Diesel generators →

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power250 kW
Standby kVA312
ControllerYB Type
Oil capacity40.0 L
AlternatorYB (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

Filters for the Cummins/Onan NTA855-G

8

Engine-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.

SystemFilterDescriptionCross-references
Oil filterP551670Lube Filter, Spin-On Full FlowCUMMINS 298670, CUMMINS 299670, NAPA 1970, CARBOCOL 0026 FridayParts $26.68
Oil filterP550777Lube Filter, Spin-On BypassCUMMINS 3021658, CUMMINS 33004232, NAPA 1749, BALDWIN B7577 FridayParts $43.56
Fuel filterP550105Fuel Filter, Spin-On PrimaryCUMMINS 154700, CUMMINS 154710, NAPA 3109, NAPA 3405 buy
Fuel filterP557440Fuel Filter, Spin-On SecondaryCUMMINS BM78672, BALDWIN BF970, LPM 00013505994, WALGAHN-MOTORENTECHN 00811464 FridayParts $189.69
Fuel / water separatorP558000Fuel Filter, Water Separator Spin-On Twist&DrainCUMMINS 3308638, CUMMINS 3308683, NAPA 3405, NAPA 3693 KuduParts $24.00 FridayParts $25.66
Fuel / water separatorP550106Fuel Filter, Water Separator Spin-OnCUMMINS 154789, CUMMINS 156164, NAPA 3405, BALDWIN BF957-D FridayParts $285.60
Coolant filterP554071Coolant Filter, Spin-OnCUMMINS 209604, CUMMINS 209606, NAPA 4071, WALGAHN-MOTORENTECHN 00811412 FridayParts $397.60
Coolant filterP554073Coolant Filter, Spin-OnCUMMINS 209605, CUMMINS 209607, NAPA 4073, VERSATILE 00104040 KuduParts $40.00

Maintenance & consumables

for the Cummins/Onan NTA855-G
ItemSpecCapacityPart #Interval
Air filter—500 hr
Fuel filter—500 hr
Oil filter—500 hr
Belt—
Coolant55.0 liters—2000 hr
OilASTM D240.0 liters—500 hr

Common questions

What size generator is 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 kind of fuel does the Cummins/Onan DFM Series 60Hz run on?

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

How much oil does the Cummins/Onan DFM Series 60Hz take?

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

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

The Cummins/Onan DFM Series 60Hz cooling system holds 55 liters (14.5 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the dry weight of the Cummins/Onan DFM Series 60Hz?

The Cummins/Onan DFM Series 60Hz has a dry weight of 2867 kg (6320 lb).

What voltages is the Cummins/Onan DFM Series 60Hz available in?

The Cummins/Onan DFM Series 60Hz is offered in 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 277/480 V, 3-phase.

How many cold cranking amps does the Cummins/Onan DFM Series 60Hz require?

The Cummins/Onan DFM Series 60Hz uses 2 batteryies, 24 V each, 225 CCA, group 8D, per the manufacturer specification sheet.

Which alternator is fitted to the Cummins/Onan DFM Series 60Hz?

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

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Engine stops cranking and fault lamp lights, after cranking approximately 75 secondsSee engine service manual for troubleshooting fuel system; After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
Fault lamp lights immediately after engine startsOverspeed condition as engine startsCheck for overspeed condition as engine starts.
Fault lamp lights and engine shuts down after running for a periodOil level (engine will shut down if sensor is closed)Check oil level.
Fault lamp lights and engine shuts down after running for a periodOil system faultCheck engine manual for troubleshooting oil system.
Fault lamp lights and engine shuts down after running for a periodHigh engine temperatureCheck 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.
Fault lamp lights and engine shuts down after running for a periodFaulty oil pressure sensor or faulty high engine temperature sensorCheck for faulty oil pressure sensor or faulty high engine temperature sensor.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DFM Series 60Hz troubleshooting guide (25 entries) →

Parts

2
Part #DescriptionQtySystem
140-1346Air Cleaner (Includes Element)1Air filter Amazon eBay $68.19
100-1359Engine, Replacement (Cummins NTA855G)1Service 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

RatingLoadL/hgal/h
Standby100%18.44.86

Available documents

Service manual — 960-0314 Onan DFM Operator's and Parts Manual (7-1975) (Onan)

This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

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