HomeCummins/OnanCummins/Onan C70

Cummins/Onan C70 Generator Set

The Cummins/Onan C70 is a 56 kW (70 kVA) Diesel standby generator set powered by a Cummins/Onan 4BT3.9-G4 engine. It is available at 254/440 V, 240/416 V, 230/400 V, 220/380 V, 127/220 V, 115/200 V and 110/190 V, DC-phase and 50 Hz. It holds about 10.9 L (2.9 gal) of oil and 21.2 L (5.6 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses 2 group-2 batteries rated 750 CCA at 12 V. The set measures 1950×1084×1480 mm (76.8×42.7×58.3 in), weighs about 1063 kg (2344 lb) and produces 97 dBA. An integrated tank holds 106 L (28.0 gal), roughly 8 hours of runtime.

56 kW
Standby
3.92 L
Displacement
10.9 L
Oil capacity
3
Document types

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

Specifications

FuelDiesel
Frequency50.0 Hz
Standby power56 kW
Standby kVA70
Prime power50 kW
ControllerPCC1300, PCC1301
Oil capacity10.9 L
Voltage options254/440 V, 240/416 V, 230/400 V, 220/380 V, 127/220 V, 115/200 V, 110/190 V
PhaseDC
Battery group2
Battery cranking750 CCA
Battery voltage12 V
Battery quantity2
Coolant capacity21.2 L
Max ambient50 °C
Dimensions (L×W×H)1950×1084×1480 mm
Dry weight1063 kg
Sound level97.0 dBA
Fuel tank106.0 L
Tank runtime8 hr

Engine

Cummins/Onan 4BT3.9-G4
Oil capacity10.9 L
Coolant capacity21.2 L
Displacement3.92 L
AspirationTurbocharged
Rated speed1500 rpm

Maintenance & consumables

for the Cummins/Onan 4BT3.9-G4
ItemSpecCapacityPart #Interval
Air filter1000 hr find
Fuel filter500 hr find
Oil filter1000 hr find
Belt1000 hr find
Coolant28.6 L
Oil26.5 L

Common questions

What is the power rating of the Cummins/Onan C70?

The Cummins/Onan C70 is rated 56 kW standby (70.0 kVA).

What engine does the Cummins/Onan C70 use?

The Cummins/Onan C70 is powered by the Cummins/Onan 4BT3.9-G4 engine.

What fuel does the Cummins/Onan C70 use?

The Cummins/Onan C70 runs on Diesel.

What is the oil capacity of the Cummins/Onan C70?

The Cummins/Onan 4BT3.9-G4 engine in the Cummins/Onan C70 has an oil capacity of 10.9 liters.

Troubleshooting

2

Fault codes

CodeMeaningCause
251Unknown J1939 FaultCan be caused by battery disconnection/isolation without a run data save operation.

Symptoms & remedies

SymptomRemedy
Flash-out of Fault Codes1. The diagnostic mode key switch must be in the On (I) position to flash out the fault codes. 2. In the diagnostic mode: a) With no active faults, the Warning and Stop lamps will be illuminated without flashing OR b) With active faults, the ECM will begin to flash out codes by first turning on the Warning lamp. 3. The Warning lamp will then turn off and the ECM will begin flashing the Stop lamp in sequence to represent the active fault code number. 4. As the fault code is flashed, short pauses will occur to indicate completion of each digit. The Warning lamp will illuminate to indicate the beginning of a fault code. 5. The ECM will continue to flash a fault until the operator uses the Fault increment (↑) or decrement (↓) rocker switch to change to a new fault.

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

Parts

15
Part #DescriptionQtySystem
0249-0814Relay 2P BaseRelay 2p base buy
0307-3047Relay (24V)Relay 24v buy
0332-3923-02Terminal BlockTerminal block buy
0332-3925-02Jumper-TerminalJumper terminal buy
0332-3926Terminal Block End StopTerminal block end stop buy
0332-3927-02Terminal Block End PlateTerminal block end plate buy
0332-3943-02Jumper-TerminalJumper terminal buy
0332-4036-02Terminal Block (Earth)Terminal block buy
4021518Alternator ManualAlternator buy
AN500T0013STARTER MOTORStarter buy
AN500T0082ALTERNATORAlternator buy
PI144D1Alternator Model1Alternator buy
UC274CAlternator Model1Alternator buy
UC274KAlternator Model1Alternator buy
V2403-M-E3BGEngine Model1Service part / kit buy

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
Prime15.0
Standby16.0

Available documents

Spec sheetOperator's manualService manual