HomeCummins/OnanCummins/Onan DDB Series

Cummins/Onan DDB Series Generator Set

The Cummins/Onan DDB Series is a 50 kW (62.5 kVA) Diesel standby generator set powered by a John Deere 6329D engine. It is available at 120/240 V, 115/230 V, 120/208 V, 127/220 V, 139/240 V, 110/190 V, 115/200 V, 240/416 V, 254/440 V, 277/480 V, 220/380 V, 230/400 V and 347/600 V, 3-phase, 60 Hz and rated 260 A. It holds about 12 L (3.2 gal) of oil and 5 L (1.3 gal) of coolant. Starting uses 2 group-2 batteries at 12 V. The set measures 2019.75×839×1335.6 mm (79.5×33.0×52.6 in) and weighs about 1000 kg (2205 lb). An integrated tank holds 3.9 L (1.0 gal), roughly 10 hours of runtime.

50 kW
Standby
5.39 L
Displacement
12.0 L
Oil capacity
2
Document types

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power50 kW
Standby kVA62
Prime power40 kW
ControllerJohn Deere 6329D
Oil capacity12.0 L
AlternatorCummins/Onan UR
Voltage options120/240 V, 115/230 V, 120/208 V, 127/220 V, 139/240 V, 110/190 V, 115/200 V, 240/416 V, 254/440 V, 277/480 V, 220/380 V, 230/400 V, 347/600 V
Phase3
Rated current260 A
Power factor0.8
Circuit breaker35 A
Battery group2H
Battery voltage12 V
Battery quantity2
Coolant capacity5 L
Dimensions (L×W×H)2019×839×1335 mm
Dry weight1000 kg
Fuel tank3.9 L
Tank runtime10 hr

Engine

John Deere 6329D
Oil capacity13.4 L
Coolant capacity18.9 L
Displacement5.39 L
Aspirationnaturally aspirated
Rated speed1800 rpm

Maintenance & consumables

for the John Deere 6329D
ItemSpecCapacityPart #Interval
Air filter503-0648503-0648100 hr PartsGeek
Fuel filter505-0019505-0019100 hr PartsGeek
Oil filter503-0197503-0197100 hr PartsGeek
Belt309-0178309-0178100 hr PartsGeek

Common questions

What is the power rating of the Cummins/Onan DDB Series?

The Cummins/Onan DDB Series is rated 50 kW standby (62.5 kVA).

What engine does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series is powered by the John Deere 6329D engine.

What fuel does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series runs on Diesel.

What is the oil capacity of the Cummins/Onan DDB Series?

The John Deere 6329D engine in the Cummins/Onan DDB Series has an oil capacity of 13.4 liters.

What alternator does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series uses a Cummins/Onan UR alternator.

What oil filter does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series uses oil filter part number 503-0197.

What fuel filter does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series uses fuel filter part number 505-0019.

What air filter does the Cummins/Onan DDB Series use?

The Cummins/Onan DDB Series uses air filter part number 503-0648.

Troubleshooting

13

Symptoms & remedies

SymptomRemedy
Fault lamp lights and, engine stops cranking after approximately 75 seconds.See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset the engine monitor by moving run-stop/reset-remote switch to reset position. Release and return to run position.
Fault lamp lights immediately after engine starts.Check for: a. overspeed condition as engine starts. b. high temperature condition. c. faulty high engine temperature sensor or overspeed switch. d. faulty starter disconnect.
Fault lamp lights after engine is running.Check the following: a. Oil level-engine will shut down after approximately 12-172'seconds if low oil pressure sensor does not open. b. Oil pressure sensor may be defective. c. High engine temperature - caused by low coolant level, faulty thermostat, etc. d. Faulty high engine temperature sensor. e. Faulty starter disconnect.
Fault lamp lights - no fault condition exists.Be certain that no fault condition exists. Disconnect lead 29, 30 and 31 from TB11 inside control box (refer to wiring diagram). If fault lamp still lights with leads disconnected, remove and replace engine monitor plug-in printed circuit board.
Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds.See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting fault, reset monitor by moving run-stop/reset-remote switch to reset position, then to either run or remote to restart engine.
Overcrank fault lamp lights after engine has run for approximately 75 seconds.Replace start-disconnect circuit board.
High engine temperature lamp lights as soon as engine starts.Check for defective sensor or actual high temperature condition.
Low oil pressure lamp lights after engine is running.Check: a. Oil level - engine will shut down after approximately 12-1/2 seconds if oil pressure is low.
High engine temperature lamp lights after engine is running.Check for: a. Defective thermostat/thermostats. b. Low coolant level. c. Defective high engine temperature sensor.
Overspeed lamp lights - no fault condition exists.Replace overspeed circuit board.
Low oil pressure fault lamp lights r no fault condition exists.Be certain that no fault condition exists. Disconnect lead 30 from TB11 inside control box (refer to wiring diagram). If low oil pressure lamp still lights, remove and replace engine monitor plug-in printed circuit board.
High engine temperature fault lamp lights - no fault condition exists.Be certain that no fault condition exists. Remove lead 31 from TB11 inside control box (refer to wiring diagram). If high engine temperature lamp still lights, remove and replace engine monitor plug-in printed circuit board.
When pressing test lamp button - one or more fault lamps do not light.Fault lamp/lamps burned out - replace.

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

Parts

42
Part #DescriptionQtySystem
104-0371Motor, Starting1Pump PartsGeek
104-0858Motor, Starting1Pump PartsGeek
140-1089Element1Air filter PartsGeek
140-1091Air Cleaner1Air filter PartsGeek
191-0665Alternator, Charge (Includes Fan)1Alternator PartsGeek
193-0104Sender, Oil Pressure Gauge1Sensor PartsGeek
193-0108Sender, Oil Pressure Gauge1Sensor PartsGeek
309-0178Switch, Thermostatic - High Coolant Temperature Alarm1Sensor PartsGeek
309-0179Switch, Thermostatic - High Coolant Temperature Shutdown1Sensor PartsGeek
416-0530Cable, Battery1Battery PartsGeek
503-0597Air Cleaner Hose1Hose PartsGeek
503-0648Clamp, Air Cleaner Hose2Hose PartsGeek
505-0019Bushing, Pipe - Reducer 1/2” to 3/8”, DFBF (1/2” to 3/8”) 505-0131 DFCB, DFCC, DFCE (3/4” to 3/8”)1Bushing PartsGeek
130-0351Fan Guard - Left Hand1Service part / kit PartsGeek
130-0352Fan Guard - Right Hand1Service part / kit PartsGeek
130-0449Cap, Radiator1Service part / kit PartsGeek
130-0713Radiator1Service part / kit PartsGeek
191-1098OTY.1Service part / kit PartsGeek
193-0202Plug, Pipe - Manifold (2")1Service part / kit PartsGeek
232-2183Part 232-21831Service part / kit PartsGeek
309-01691 Begin Spec G 25 261Service part / kit PartsGeek
312-0058Screw (5/16-18 x 3/4"), Terminal Bracket Mounting1Service part / kit PartsGeek
332-1292Bracket and Terminal Assembly1Service part / kit PartsGeek
416-0446Cable, Battery (#2/0) 12-1/2" (Jumper)32Service part / kit PartsGeek
416-053111 4W0446 1 %2 403-0!!36 la ~~~ :1Service part / kit PartsGeek
502-0058Tee, Pipe - Oil Line The Following Is a Special List Of Corros1Service part / kit PartsGeek
503-0098Hose, Drain1Service part / kit PartsGeek
503-0197503-0197 Miscellaneous Engine1Service part / kit PartsGeek
504-0011Valve, Shutoff (1/2”)1Service part / kit PartsGeek
504-0028Valve, Radiator Drain1Service part / kit PartsGeek
505-0050.-- n.-l. . OW-UUCJI1Service part / kit PartsGeek
505-0100Nipple, Pipe - Close (1/2”)1Service part / kit PartsGeek
505-0131Bushing, Pipe - Reducer (3/4º to 3/8º)1Service part / kit PartsGeek
505-0185Adapter, Oil Drain1Service part / kit PartsGeek
526-0115Washer (5/16 “)2Service part / kit PartsGeek
800-0024Clamp, Tube Sleeving, 5'Lg1Service part / kit PartsGeek
800-0030SCREW, HEX CAP1Service part / kit PartsGeek
800-0051Screw-H}iC(3/8-16xl 1/4)1Service part / kit PartsGeek
800-0090Cable, Battery - Negative1Service part / kit PartsGeek
800-0094Screw, Cap – Hex Head (1/2–13 x 2")1Service part / kit PartsGeek
850-0045Washer, Lock - Spring (1/4" )2Service part / kit PartsGeek
850-0050Washer, Lock - Spring (3/8”)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
Prime100%3.910.0
Standby100%3.910.0

Available documents

Operator's manual — 944-0120 Onan DDB Operator's Manual (2-1978) (Cummins/Onan)Owner's manual — 944-0302 Onan DDB Operator's and Parts Manual (4-1974) (Cummins/Onan)

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