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Home›Cummins/Onan›Cummins/Onan 30DEH-3R

Cummins/Onan 30DEH-3R Generator Set

The Cummins/Onan 30DEH-3R is a Diesel generator set powered by a Ford 242DF-6005-A engine. It is available at 120/240 V, 3-phase and 60 Hz. It holds about 3.03 L (0.8 gal) of oil and 6.4 L (1.7 gal) of coolant. Starting uses 2 group-1 batteries at 12 V. The set measures 1701×838×1092 mm (67.0×33.0×43.0 in) and weighs about 794 kg (1750 lb).

3.96 L
Displacement
3.03 L
Oil capacity
1
Document types

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

Specifications

FuelDiesel
Frequency60.0 Hz
Standby kVA30
Oil capacity3.03 L
AlternatorMotorola 70D44039B
Voltage options120/240 V
Phase3
Power factor0.8
Battery group1H
Battery voltage12 V
Battery quantity2
Coolant capacity6.4 L
Dimensions (L×W×H)1701×838×1092 mm
Dry weight794 kg

Engine

Ford 242DF-6005-A
Oil capacity3.03 L
Coolant capacity6.4 L
Displacement3.96 L
AspirationNaturally aspirated
Rated speed1800 rpm

Maintenance & consumables

for the Ford 242DF-6005-A
ItemSpecCapacityPart #Interval
CoolantCooling System24.5 qt—
OilEngine Oil8.0 qt—

Common questions

What engine does the Cummins/Onan 30DEH-3R use?

The Cummins/Onan 30DEH-3R is powered by the Ford 242DF-6005-A engine.

What fuel does the Cummins/Onan 30DEH-3R use?

The Cummins/Onan 30DEH-3R runs on Diesel.

What is the oil capacity of the Cummins/Onan 30DEH-3R?

The Ford 242DF-6005-A engine in the Cummins/Onan 30DEH-3R has an oil capacity of 3.03 liters.

What alternator does the Cummins/Onan 30DEH-3R use?

The Cummins/Onan 30DEH-3R uses a Motorola 70D44039B alternator.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Generator will not build up voltage.Circuit breaker in ‘‘off’’ or ‘‘tripped’’ position.Reset and close breaker.
No AC power to Magneciter.Check AC voltage at E1-E2 with the plant operating. Voltage should be 5 percent of the rated voltage. If not, check continuity from E1-E2 back to generator.
Partial loss of residual in rotor.With plant operating, jumper from E2 to heat sink of field rectifier Z until voltage begins to build up. Then remove.
Pair of field rectifiers open (either W and Z or X and Y).Test rectifiers and replace if defective.
Both field rectifiers X and Y shorted.Test rectifiers and replace if defective.
Output voltage slow to build up.Either field rectifier X or Y circuit breaker opens in about 5 seconds.Test rectifiers and replace if shorted.

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

Parts

58
Part #DescriptionQtySystem
102P532Gasket, Oil Drain1Gasket PartsGeek
140B62Cleaner, Air1Air filter PartsGeek
149B1114Bracket, Primary Fuel Filter Mtg.1Fuel filter PartsGeek
149C1078Filter, Fuel - Primary1Fuel filter PartsGeek
149P846Cartridge, Fuel Filter1Fuel filter PartsGeek
150A638Joint, Rod to Inj. Pump1Pump PartsGeek
155A633Tube, Exh. Flexible1Hose PartsGeek
185-112Gasket, Exhaust Tube1Gasket PartsGeek
191B665Alternator, Charge (Motorola #70D44039B)1Alternator PartsGeek
193A104Element, Water Temp.1Sensor PartsGeek
193A108Element, Oil Pressure1Sensor PartsGeek
307B6228Solenoid, Stopping (12 V)1Sensor PartsGeek
309A179Switch, Water Hi-Temp.1Sensor PartsGeek
309B10Switch, Low Oil Pressure1Sensor PartsGeek
416A532Cable, Starter Ground1Starter PartsGeek
501-3Line, Fuel - Pump To Primary Filter1Hose PartsGeek
501-4Line, Fuel - Primary to Secondary Filter1Hose PartsGeek
502-35Connector, Primary Fuel Filter1Fuel filter PartsGeek
503-131Clamp, Hose - Oil Drain1Hose PartsGeek
503-262Hose, Oil Drain1Hose PartsGeek
503-354Clamp, Air Clnr. Hose1Hose PartsGeek FridayParts $30.00
503-465Clamp, Air Clnr. Hose3Hose PartsGeek
503A44Hose, - Rad.2Hose PartsGeek
503A510Hose, Air Clnr. To Connector1Hose PartsGeek
503A545Hose, Breather1Hose PartsGeek
503B455Hose, Air Clnr. Connector to Manifold1Hose PartsGeek
503P311Clamp, Hose4Hose PartsGeek
51P79Belt, Chg. Alt.1Belt PartsGeek
101A516Cover, Starter Motor Mtg. Hole1Service part / kit PartsGeek
102ZA619Adapter, Oil Drain1Service part / kit PartsGeek
130B449Cap, Radiator1Service part / kit PartsGeek
130C351Guard, Fan (L.H.)1Service part / kit PartsGeek
130C352Guard, Fan (R.H.)1Service part / kit PartsGeek
130D712Radiator1Service part / kit PartsGeek
140A80Band, Air Clnr. Mtg. Filter2Service part / kit PartsGeek
140A968Connector, Air Clnr. to Manifold Hoses1Service part / kit PartsGeek
140A970Clip, Breather Tube1Service part / kit PartsGeek
140B767Bracket, Air Clnr. Mtg.1Service part / kit PartsGeek
150A1139Lever, Governor Stop1Service part / kit PartsGeek
155A863Tube, Exhaust1Service part / kit PartsGeek
155C917Muffler1Service part / kit PartsGeek
306A162Retainer, Stop Sol. Plunger1Service part / kit PartsGeek
306A198Spring, Stop Sol. Plunger1Service part / kit PartsGeek
306A199Plunger, Stop Solenoid1Service part / kit PartsGeek
306A215Rod, Stop Sol.1Service part / kit PartsGeek
306B214Solenoid Bracket Mtg.1Service part / kit PartsGeek
312A58Condenser1Service part / kit PartsGeek
338-378Harness, Engine Cont.1Service part / kit PartsGeek dieselpartscenter $310.15
403A315Spacer, Air Clnr. Mtg. Brkt.2Service part / kit PartsGeek
502-254Tee, Fuel Ret.1Service part / kit PartsGeek dieselpartscenter $31.62
502-4Elbow, Primary Filter1Service part / kit PartsGeek
502-55Elbow, Secondary Filter1Service part / kit PartsGeek
504-28Valve, Rad. Drain1Service part / kit PartsGeek
504-30Valve, Oil Drain1Service part / kit PartsGeek
505-224Nipple, Pipe - Oil Drain1Service part / kit PartsGeek
505A135Nipple, Half, Oil Drain1Service part / kit PartsGeek
518-203Ring, Snap - Sprg. Ret.1Service part / kit PartsGeek
902-5Coupling1Service 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.

Available documents

Operator's manual — 976-0304 Onan DEH (spec A) Genset Operator's & Parts manual (10-1969) (Cummins/Onan)