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Cummins/Onan 2.5 EGHAA Generator Set

The Cummins/Onan 2.5 EGHAA is a 2000 kW (1800 kVA) Gasoline standby generator set powered by a Cummins/Onan GH170 engine. It is available at 120 V, Single-phase, 60 Hz and rated 16.7 A. It holds about 1.16 L (0.3 gal) of oil. The set measures 681×711×540 mm (26.8×28.0×21.3 in) and weighs about 32.9 kg (73 lb). An integrated tank holds 6 L (1.6 gal), roughly 3.54 hours of runtime.

2000 kW
Standby
0.169 L
Displacement
1.16 L
Oil capacity
1
Document types

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

Specifications

FuelGasoline
Frequency60.0 Hz
Standby power2000 kW
Prime power1800 kW
Oil capacity1.16 L
Voltage options120 V
PhaseSingle
Rated current16.7 A
Power factor0.833
Battery voltage12 V
Dimensions (L×W×H)681×711×540 mm
Dry weight32 kg
Fuel tank6.0 L
Tank runtime3.54 hr

Engine

Cummins/Onan GH170
Oil capacity0.63 L
Displacement0.169 L
Rated speed3600 rpm

Filters & service parts

model family
ItemSpecCapacityPart #Interval
Air filterReplace air cleaner element—400 hr find
Fuel filterReplace fuel filter—200 hr find
Oil filterReplace oil filter according to local regulations—400 hr find
BeltReplace belts as needed— find
CoolantChange coolant as needed—
OilAPI Class SG or SH oil (also SG/CD, SG/CE, SH/CD or SH/CE)—200 hr

Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.

Common questions

What is the power rating of the Cummins/Onan 2.5 EGHAA?

The Cummins/Onan 2.5 EGHAA is rated 2000 kW standby.

What engine does the Cummins/Onan 2.5 EGHAA use?

The Cummins/Onan 2.5 EGHAA is powered by the Cummins/Onan GH170 engine.

What fuel does the Cummins/Onan 2.5 EGHAA use?

The Cummins/Onan 2.5 EGHAA runs on Gasoline.

What is the oil capacity of the Cummins/Onan 2.5 EGHAA?

The Cummins/Onan GH170 engine in the Cummins/Onan 2.5 EGHAA has an oil capacity of 0.63 liters.

Troubleshooting

12

Symptoms & remedies

SymptomCauseRemedy
FAILS TO CRANK (ELECTRIC START MODELS)Low Battery, Bad battery connection, Oil is too heavy, Load is connectedCheck battery electrolyte level and charge. Clean and tighten all battery and cable connections. Replace with lighter oil. Always disconnect load while starting.
CRANKS SLOWLY (ELECTRIC START MODELS)Choke closed, Dirty air filter, Rich fuel mixtureOpen choke. Clean or replace air filter. Contact an Onan service center.
ENGINE WONT STARTLoose or worn spark plug lead, Faulty spark plug, Dirty fuel filter or generator set at too steep of an angle, Governor out of adjustment or lean fuel mixCheck spark plug lead connection. Remove and clean or replace spark plug. Check fuel filter and generator set angle. Contact an Onan service center.
EXHAUSTING BLACK SMOKEOpen DC circuit breaker due to an overloadRemove all loads, reset circuit breaker, check for an overload or short circuit. Do not exceed generator set rated load specifications.
UNIT RUNS THEN STOPSAdd fuel. Add oil. Reduce oil level.
UNIT RUNS BUT SURGESAdd fuel. Add oil. Reduce oil level.
NO AC OUTPUT VOLTAGEOpen AC circuit breaker due to an overloadRemove all loads, re-set circuit breaker, check tools or appliances being used for defects. Do not exceed generator set rated load specifications.
FAILS TO CRANK1. Low battery. 2. Bad battery connection.1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
CRANKS SLOWLY1. Low battery. 2. Bad battery connection.1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
ENGINE WON’T START1. Fuel below genset pickup level in tank. 2. Fuel supply shutoff valve closed. 3. Remove spark plug and clean. 4. Add oil if necessary.1. Add fuel. 2. Fully open fuel supply valve. 3. Replace with recommended oil. 4. Disconnect load while starting.
UNIT RUNS THEN SURGES1. Loose or worn spark plug lead 2. Faulty spark plug. 3. Dirty fuel filter or generator set at too steep of an angle. 4. Governor out of adjustment or lean fuel mixture.1. Check spark plug lead connection. 2. Remove and clean or replace. 3. Check fuel filter and angle of generator set. 4. Contact an Onan service center.
NO DC OUTPUT VOLTAGE1. Open DC circuit breaker due to an overload.1. Remove all loads, reset breaker, check for shorted battery or load defects. Do not exceed rated load specifications.

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

Parts

1model family
Part #DescriptionQtySystem
LS1149Oil WatchService part / kit PartsGeek

Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Available documents

Service manual — 965-0100 Onan EGHxx series Portable genset Operator's manual (10-1995) (Cummins/Onan)