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Cummins/Onan 5000 Generator Set

The Cummins/Onan 5000 is a 41.7 kW (1800 kVA) Gasoline prime generator set. It is available at 120 V, AC and rated 41.7 A. It holds about 3.5 L (0.9 gal) of oil, with a maximum ambient rating of 40 °C. Starting uses 1 group-360 battery rated 450 CCA at 12 V. The set measures 566×854×394 mm (22.3×33.6×15.5 in) and weighs about 116 kg (256 lb).

3.5 L
Oil capacity
0
Document types

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Service parts for the 5000

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required
N20SBAir filtersee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelGasoline
Prime power41 kW
Oil capacity3.5 L
Voltage options120 V
PhaseAC
Rated current41.7 A
Circuit breaker10 A
Battery group360
Battery cranking450 CCA
Battery voltage12 V
Battery quantity1
Max ambient40 °C
Dimensions (L×W×H)566×854×394 mm
Dry weight116 kg

Maintenance & consumables

ItemSpecCapacityPart #Interval
Air filterBreaker Ampere Rating 2000AN20SB Amazon eBay

Common questions

Is the Cummins/Onan 5000 diesel or gas?

The Cummins/Onan 5000 runs on Gasoline.

What air filter fits the Cummins/Onan 5000?

The Cummins/Onan 5000 uses air filter part number N20SB.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
FAILS TO CRANK1. Low battery. 2. Bad battery connection. 3. Blown fuse.1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections. 3. Replace fuse on control box.
CRANKS SLOWLY1. Low battery. 2. Bad battery connection. 3. Blown fuse.1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections. 3. Replace fuse on control box.
CRANKS BUT WON'T START1. Low battery. 2. Bad battery connection. 3. Oil is too heavy. 4. Load connected.1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections. 3. Replace with lighter oil. 4. Disconnect load while starting.
EXHAUSTING BLACK SMOKE1. Fuel below genset pickup level in tank. 2. Fuel supply shutoff valve closed. 3. Carbon deposits on spark plugs. 4. Low oil level.1. Add fuel. 2. Fully open fuel supply valve. 3. Remove spark plugs and clean. 4. Add oil if necessary.
UNIT RUNS THEN STOPS1. Fuel below genset pickup level in tank. 2. Fuel supply shutoff valve closed. 3. Carbon deposits on spark plugs. 4. Low oil level.1. Add fuel. 2. Fully open fuel supply valve. 3. Remove spark plugs and clean. 4. Add oil if necessary.
UNIT RUNS THEN SURGES1. Rich fuel mixture. 2. Dirty air filter. 3. Choke stuck.1. (Gasoline sets) Turn main fuel adjustment in 1/8 turn (see Figure 3-3). (Altitude adjustment only; otherwise, contact an Onan service center.) 2. Replace air filter. 3. Contact an Onan service center.

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

Parts

16
Part #DescriptionQtySystem
AMX36239Manifold GasketGasket Amazon
AN500T0122STARTER MOTOR - Aftermarket ManufactureStarter Amazon eBay
AN500T0127STARTER MOTORStarter Amazon eBay
AN500T0134STARTER MOTORStarter Amazon eBay
AN500T0168STARTER DRIVEStarter Amazon eBay
AN500T0169STARTER DRIVEStarter Amazon eBay
AN500T0170STARTER DRIVEStarter Amazon eBay
AN500T0171STARTER DRIVEStarter Amazon eBay
AN500T0172STARTER DRIVEStarter Amazon eBay
AN500T0173STARTER DRIVEStarter Amazon eBay
N20SBBreaker Ampere Rating 2000AAir filter Amazon eBay
40KIPODBreaker Padlocking Devices 5000A FrameService part / kit Amazon
LBCUM8.3T8950Core charge includes similar block core only Cast # - 3923275, 3926567, 3938058Service part / kit buy
SBMID40Internal and External Accessories 5000A FrameService part / kit Amazon
SBMIF40Internal and External Accessories 5000A FrameService part / kit Amazon
SBSS40Frame Size 5000AService part / kit Amazon

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