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Home›Cummins/Onan›Cummins/Onan DGBC

Cummins/Onan DGBC Generator Set

The Cummins/Onan DGBC is a 40 kW (50 kVA) Diesel standby generator set powered by a Cummins/Onan 4B3.9-G2 engine. It is available at 600 V, 3-phase. It holds about 10.9 L (2.9 gal) of oil and 17.7 L (4.7 gal) of coolant. Starting uses 1 group-4 battery rated 1080 CCA at 12 V. The set measures 3188×1067×1753 mm (125.5×42.0×69.0 in), weighs about 1672 kg (3686 lb) and produces 68 dBA at 7 m. An integrated tank holds 341 L (90.1 gal), roughly 12.9 hours of runtime.

40 kW
Standby
3.9 L
Displacement
10.9 L
Oil capacity
4
Document types

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

Specifications

FuelDiesel
Standby power40 kW
Standby kVA50
Prime power32 kW
ControllerDetector, PCC, PowerCommand, PowerCommand 2100, PowerCommand 3100
Oil capacity10.9 L
AlternatorCummins/Onan 12-lead reconnectable alternator fitted with voltage selection switch
Voltage options600 V
Phase3-phase
Battery group4
Battery cranking1080 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity17.7 L
Dimensions (L×W×H)3188×1067×1753 mm
Dry weight1672 kg
Sound level68.0 dBA @ 7 m
Fuel tank341.0 L
Tank runtime12.9 hr

Engine

Cummins/Onan 4B3.9-G2
Coolant capacity17.3 L
Displacement3.9 L
AspirationNatural
Rated speed1500 rpm

Maintenance & consumables

for the Cummins/Onan 4B3.9-G2
ItemSpecCapacityPart #Interval
Air filterCummins engine Operation and Maintenance Manual—8760 hr find
Fuel filterCummins engine Operation and Maintenance Manual—50 hr find
Oil filterCummins engine Operation and Maintenance Manual—500 hr find
BeltCummins engine Operation and Maintenance Manual— find
CoolantCummins engine Operation and Maintenance Manual—
Coolant filter— find
OilCummins engine Operation and Maintenance Manual—500 hr

Common questions

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

The Cummins/Onan DGBC is rated 40 kW standby (50.0 kVA).

What engine does the Cummins/Onan DGBC use?

The Cummins/Onan DGBC is powered by the Cummins/Onan 4B3.9-G2 engine.

What fuel does the Cummins/Onan DGBC use?

The Cummins/Onan DGBC runs on Diesel.

What alternator does the Cummins/Onan DGBC use?

The Cummins/Onan DGBC uses a Cummins/Onan 12-lead reconnectable alternator fitted with voltage selection switch alternator.

Troubleshooting

63

Fault codes

CodeMeaningRemedy
F01Generator does not start.Check the battery voltage and ensure it is above 12V. Verify that the fuel supply is adequate and check for any fuel system issues. Refer to the Fault Code Table for further troubleshooting.
F02Generator produces low output power.Check the air filter for blockage or damage. Verify that the fuel supply is adequate and check for any fuel system issues. Refer to the Fault Code Table for further troubleshooting.
F03Generator produces excessive noise.Check the engine oil level and ensure it is within the recommended range. Verify that all components are properly tightened, including bolts and nuts. Refer to the Fault Code Table for further troubleshooting.
F04Generator produces excessive vibration.Check the engine mounts for any damage or wear. Verify that all components are properly tightened, including bolts and nuts. Refer to the Fault Code Table for further troubleshooting.
F05Generator produces excessive exhaust smoke.Check the air filter for blockage or damage. Verify that the fuel supply is adequate and check for any fuel system issues. Refer to the Fault Code Table for further troubleshooting.
F06Generator produces excessive heat.Check the cooling system for any leaks or blockages. Verify that the coolant level is within the recommended range. Refer to the Fault Code Table for further troubleshooting.
F07Generator produces excessive oil consumption.Check the engine oil level and ensure it is within the recommended range. Verify that all components are properly tightened, including bolts and nuts. Refer to the Fault Code Table for further troubleshooting.
F08Generator produces excessive fuel consumption.Check the air filter for blockage or damage. Verify that the fuel supply is adequate and check for any fuel system issues. Refer to the Fault Code Table for further troubleshooting.
121Speed Signal Lost
135Oil Pressure Sensor High
141Oil Pressure Sensor Low
143Pre-Low Oil Pressure Sensor
144Coolant Temperature Sensor High
145Coolant Temperature Sensor Low
146Pre-High Cool Temp
151High Coolant Temp
197Low Coolant Level
234Overspeed
235Low Coolant Level
359Fail to Start
415Low Oil Pressure
441Low Battery Voltage
442High Battery Voltage
1123Shutdown After Battle Short
1124Delayed Shutdown
1131Battle Short Active
1244Engine Normal Shutdown
1311Customer Inputs #1
1312Customer Inputs #2
1317Customer Inputs #3
1318Customer Inputs #4
1334Crit Scaler OR
1335Non-Crit Scaler OR
1416Fail to Shutdown
1417Power Down Failure
1433Emergency Stop
1434Remote Emergency Stop
1435Low Coolant Temperature
1438Fail to Crank
1442Weak Battery
1443Battery Failed
1444KW Overload
1445Short Circuit
1446High AC Voltage
1447Low AC Voltage
1448Under Frequency
1449Over Frequency
1461Loss of Field
1466Modem Failure
1468Network Error
1469Speed/Hz Match
1471Over Current
1472Over Current
2335Excitation Fault
2336Memory Error
2341High Control Temperature
2342Too Long in Idle
2967Governor Fault
2968AVR Fault
2969LON Failure
2972Field Overload

Symptoms & remedies

SymptomRemedy
Status Indicators are not functioning properly.Check the status indicators for any visible damage or loose connections. If the issue persists, refer to the Fault Code Table for further troubleshooting.
Line Circuit Breaker (Optional) trips frequently.Check the circuit breaker for any visible damage or loose connections. Verify that the generator's load is within the rated capacity of the circuit breaker.

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

Parts

134
Part #DescriptionQtySystem
102-1147Gasket, Drain - Oil Pan1Gasket PartsGeek
140-2164Nut, Square (1/4-20)1Nut PartsGeek
150-2007Guard. Belt Screw. Cap - Hex Head (1/2-13 X 2-1/4“)1Belt PartsGeek FridayParts $263.79
150-2201Sensor, Speed – Magnetic1Sensor PartsGeek
187-0001Pump, Water1Pump PartsGeek
187-0002Gasket Kit, End - Top1Gasket PartsGeek
187-0008Belt, Drive4Belt PartsGeek
187-0009Thermostat4Thermostat PartsGeek
187-0010Gasket, ThermostatThermostat PartsGeek
187-0011Filter, Fuel1Fuel filter PartsGeek
187-0012Gasket, Cover - Valve1Gasket Amazon eBay PartsGeek
187-0013Pump, Transfer - FuelPump Amazon eBay PartsGeek
187-0015Filter, Oil1Oil filter Amazon eBay $39.95 PartsGeek
187-0020Pump, Injection1Pump PartsGeek
193-0244Sender, Oil Pressure (E1)1Sensor PartsGeek
193-0353Sender, Temperature - Oil1Sensor PartsGeek
193-0375# Sender, Water Temperature1Sensor PartsGeek
2.4LEngine1Engine PartsGeek
240976Switch, high temperature 268298 Sender, temperature1Sensor PartsGeek
241481Switch, high temperature 268298 Sender, water temperature1Sensor PartsGeek
265484Line. flex. fuel, 41"2Hose PartsGeek
266110Line, flex. fuel, 50”2Hose PartsGeek
268298Sender, water temperature gauge1Sensor PartsGeek
271500Line. flex. fuel, 22”Hose PartsGeek
285498Hose, moldedHose PartsGeek
285542Gasket. manifoldGasket PartsGeek
285722Hose, upper moldedHose PartsGeek
285957Line. flex. fuelHose PartsGeek
290090Switch, low water temperature1Sensor PartsGeek
309-0269Air Cleaner (Includes Element) - Standard1Sensor PartsGeek
309-0272Air Cleaner - Heavy Duty (10" Inlet Tube)1Air filter PartsGeek
309-0553Switch, Temperature - Low Engine Coolant (S4)1Sensor PartsGeek
309-0554Switch, Oil Pressure - 20 PSI (S5 Pre-Alarm)1Sensor PartsGeek
309-0561Switch, Low Oil Pressure1Oil filter PartsGeek
332-0051Clip, Wire - Fuel Hose---—2Hose PartsGeek
353-0094-01Connector Housing and Contact Pins, 8 Pin (Less Pins)1Connector PartsGeek
405-3826-01Support, Engine - Screw, Cap - Hex Head (M12 x 1.75 x 65mm)1Support PartsGeek
503-0098Hose, Oil Drain - Bulk (3/4-Hose PartsGeek
503-0183Clamp, Hose1Hose PartsGeek
503-0365Clamp, Hose1Hose PartsGeek
503-0685Clamp, Hose2Hose PartsGeek
505-0104Element - Air Cleaner - Heavy Duty Primary [AM# CD1830610826]1Air filter PartsGeek
526-0018Gasket, Flange (1-3/4)1Gasket PartsGeek FridayParts $1002.50
750-1010Screw, Machine - Fillister Head (1/4-20 x 1")1Screw PartsGeek
821-0018Thermostat (Includes Plugs)1Thermostat PartsGeek
A046K020Oil Filter1Oil filter PartsGeek
X-797-2Hose, flex1Hose PartsGeek
0L2090-C60 kW (2.4 L)1Service part / kit PartsGeek
102-1237Adapter, Oil Drain (Ml8 x 1/2") (S2)1Service part / kit PartsGeek
145-0596Service part / kit PartsGeek
150-2187Lever, Actuator - Governor1Service part / kit PartsGeek
150-2203Service part / kit PartsGeek
150-2218Service part / kit PartsGeek
150-2251Joint, Ball2Service part / kit PartsGeek
151-0611Control, Governor1Service part / kit PartsGeek FridayParts $249.00
151-0632Service part / kit PartsGeek FridayParts $315.00
154-2581Service part / kit PartsGeek
155-2062Service part / kit PartsGeek
155-2080Service part / kit PartsGeek
155-2175Clamp, Muffler 4"1Service part / kit PartsGeek
155-2256Service part / kit PartsGeek
155-2353Service part / kit PartsGeek
187-0004Service part / kit PartsGeek
187-0007Service part / kit PartsGeek
187-0017Service part / kit Amazon eBay PartsGeek
187-0018Service part / kit PartsGeek
187-0146Service part / kit PartsGeek
187-0198Service part / kit PartsGeek
323-1200Resistor, Fixed, Wirewound AR1Service part / kit PartsGeek
323-1304tiotming, Umector1Service part / kit PartsGeek
323-1306Screw, Cap - Hex Head (1/4-20 x 1/2")1Service part / kit PartsGeek
332-0325Service part / kit PartsGeek
332-0941*Tie, Cable2Service part / kit PartsGeek
332-1087Service part / kit PartsGeek
332-1279Insulated8Service part / kit PartsGeek
332-1445Tie, Cable 18 98-5219 1 Decal - Panel Front (Not I l l u s t r a t e d ) 19 98-5220 1 Decal3Service part / kit PartsGeek
332-2739Bracket1Service part / kit PartsGeek
332-2921Switch, Temperature - Washer, Lock (M8)1Service part / kit PartsGeek
333-0291Service part / kit PartsGeek
333-0292Service part / kit PartsGeek
353-0094Service part / kit PartsGeek
357-0030RECTIFIER ‘BATT CHARGING2Service part / kit PartsGeek
416-0446Cable, Battery (#2/0) 12-1/2" (Jumper)32Service part / kit PartsGeek
416-0893Service part / kit PartsGeek
416-0921Service part / kit PartsGeek
501-0441Line, Fuel - Flex (Fuel In)1Service part / kit PartsGeek
501-0502Line, Fuel - Flex (Fuel out)1Service part / kit PartsGeek
503-0197503-0197 Miscellaneous Engine1Service part / kit PartsGeek
504-0011Valve, Shutoff (1/2”)1Service part / kit PartsGeek
505-0026Coupling, Pipe (1/8")2Service part / kit PartsGeek
505-0050Nut, Cap - Hex Head (#10-32 x 30mm)1Service part / kit PartsGeek
505-0059Tee, Pipe (1/8") - Controls with Indicator Lights1Service part / kit PartsGeek
505-0098Band1Service part / kit PartsGeek
505-0185Ball, Fly - Governor1Service part / kit PartsGeek
505-1373Service part / kit PartsGeek
526-0008*Washer, Flat (#10)11Service part / kit PartsGeek
526-0115Washer (5/16 “)2Service part / kit PartsGeek
526-0196Washer, Spacer - Shield JC)INT, BALL LINKAGE0Service part / kit PartsGeek
526-0327Service part / kit PartsGeek
800-0012Screw, Cap - Hex Head (1/4-20 x 2-1/4”) Begin Spec C MANIFOLD KIT, INTAKE2Service part / kit PartsGeek
800-0048Screw, Cap - Hex Head (3/8-16 x 3/4”)1Service part / kit PartsGeek
800-1003Service part / kit PartsGeek
800-2060016-40820 NE 1 Screw. Cap - Hex Head (M8-1.25 x 35MM) 3 856-00080Service part / kit PartsGeek
800-2110Hood, Inlet - Air Molded1Service part / kit PartsGeek
800-2112Screw. Cap - Hex Head (M12 x 30nin)2Service part / kit PartsGeek
812-007533?-27395Service part / kit PartsGeek
813-0103Screw, Machine - Round Head (#10-32 x 3/4º)1Service part / kit PartsGeek
815-0172Cover, Adapter Outlet1Service part / kit PartsGeek
850-0025*Washer, Lock - Spring (#8)1Service part / kit PartsGeek
850-0030Washer, Lock - Spring (#10)1Service part / kit PartsGeek
850-0050Washer, Lock - Spring (3/8”)4Service part / kit PartsGeek
850-2006Washer, Lock - Spring (M6)1Service part / kit PartsGeek
850-2008Heater, Engine Coolant1Service part / kit PartsGeek
850-2012Washer, Lock - Spring (M12)16Service part / kit PartsGeek
856-0013Washer1Service part / kit PartsGeek
860-2007Screw, Machine - Round Head (M10 x 32 x 3/4")1Service part / kit PartsGeek
870-0053(350-00301Service part / kit PartsGeek
870-0131*Nut, Hex - w/ET (#10-32) *Breaker, Circuit 60 Hertz1Service part / kit PartsGeek
870-0212Nut, Locking (1/4-20)4Service part / kit PartsGeek
871-0010#Nut2Service part / kit PartsGeek
871-0028Service part / kit PartsGeek
928-0502BService part / kit PartsGeek
928-0506Service part / kit PartsGeek
960-0135Service part / kit PartsGeek
960-0136Battery, 24V, 55Ah, AGM8Service part / kit PartsGeek
960-0242Service part / kit PartsGeek
960-0504AService part / kit PartsGeek
960-0505Service part / kit PartsGeek
960-12Service part / kit PartsGeek
A-290538Block heaterService part / kit PartsGeek
A-290885Heater, block (240V)Service part / kit PartsGeek
K19-CP460 kWe1Service part / kit PartsGeek
K38-CP920 kWe1Service part / kit PartsGeek
K50-CP1240 kWe1Service 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
Prime
Standby

Available documents

Spec sheet — s-1408 (Cummins/Onan)Spec sheet — s-1451 (Cummins/Onan)Spec sheet — s-1573 (Cummins/Onan)Operator's manual — 960-0107 Cummins DGBB DGCB DGDB DGFA Operator's Manual (7-2009) (Cummins/Onan)Operator's manual — Cummins-DGBB-DGBC-DGCA-DGCB-DGCG-DGFA-DGFB-DGFC-DGFS-operator-manual (Cummins/Onan)Parts manual — 0932-0112 Onan Post-Sale Literature Index (07-1998) (Cummins/Onan)Parts manual — 0960-0291 I7 201305 (Cummins/Onan)Parts manual — 960-0231 Onan DGB DGC Parts Manual (6-1993) (Cummins/Onan)Service manual — 0960-0210 I8 201512 (Cummins/Onan)Service manual — 900-0524B Onan DGxx Power Command Control 3100 Series Paralleling Gensets Operation & Service manual (01-2002) (Cummins/Onan)Service manual — 900-0907 Cummins DGxx Series Repair Times (Cummins/Onan)Service manual — 960-0505 Onan DGxx QSxx Detector Controls Generator Set Service Manual (04-2001) (Cummins/Onan)Service manual — 960-0510B Onan DGBB thru DGFC Series Service Manual (10-1998) (Cummins/Onan)Service manual — 960-0511B Cummins DGBB DGC DGD DGF Series Service Manual (10-2001) (Cummins/Onan)Service manual — 960-0518D Cummins DGBB DGC DGDA DGFB Series Service Manual (2-2004) (Cummins/Onan)Service manual — 960-0615C Cummins DGBB DGC DGFA Series Operator's Manual (10-2003) (Cummins/Onan)Service manual — 960-0618D Cummins DGBB DGCA DGEA DGFA Series Installation Manual (10-2001) (Cummins/Onan)Service manual — 960-0628D Cummins DGB DGC DGF Series Installation Manual (2-2004) (Cummins/Onan)Service manual — DG Generator Set Service Manual PCC 3100 (Cummins/Onan)

Other sets with this engine

Cummins/Onan 35 DGBBCummins/Onan 40 DGBCCummins/Onan C40 D6Cummins/Onan C40/1D6Cummins/Onan C45D5Cummins/Onan C70D5Cummins/Onan DGBB