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Cummins/Onan GNAA Generator Set

The Cummins/Onan GNAA is a 7 kW (8.8 kVA) LPG, NG standby generator set powered by a Cummins/Onan OYA engine. It is available at 60 V and 50 V, Single-phase and 60 Hz. It holds about 3.4 L (0.9 gal) of oil and 6.4 L (1.7 gal) of coolant. Starting uses 1 battery rated 525 CCA at 12 V.

7 kW
Standby
0.93 L
Displacement
3.4 L
Oil capacity
2
Document types

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

Specifications

FuelLPG, NG
Frequency60.0 Hz
Standby power7 kW
Standby kVA8
Prime power7 kW
ControllerElectronically Regulated, PCC
Oil capacity3.4 L
Voltage options60 V, 50 V
PhaseSingle
Power factor1.0
Battery cranking525 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity6.4 L
Tank runtime[45, 70, 87] hr

Engine

Cummins/Onan OYA
Oil capacity3.4 L
Coolant capacity6.4 L
Displacement0.93 L
AspirationNaturally aspirated

Maintenance & consumables

for the Cummins/Onan OYA
ItemSpecCapacityPart #Interval
Oil filterIncluded in oil capacity186-XXXX500 hr PartsGeek

Common questions

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

The Cummins/Onan GNAA is rated 7 kW standby (8.8 kVA).

What engine does the Cummins/Onan GNAA use?

The Cummins/Onan GNAA is powered by the Cummins/Onan OYA engine.

What fuel does the Cummins/Onan GNAA use?

The Cummins/Onan GNAA runs on LPG, NG.

What is the oil capacity of the Cummins/Onan GNAA?

The Cummins/Onan OYA engine in the Cummins/Onan GNAA has an oil capacity of 3.4 liters.

Troubleshooting

23

Symptoms & remedies

SymptomCauseRemedy
The air cleaner or exhaust system is blocked.Service as necessary.
Low engine temperature is causing too low a cranking speed for starting.A. Plug in, repair or install engine coolant and engine oil heaters. B. Replace the engine oil if it is not of the recommended viscosity for the ambient temperature.
Cranking voltage is too low to reach required cranking speed.A. Clean and tighten or replace the positive (+) and negative (–) battery cable connectors and cables at the battery and the set. B. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C).
No output voltage.1. A line circuit breaker is Off. Find out why the circuit breaker was turned Off, make sure it is safe to reconnect power, and then throw the circuit breaker On. 2. A line circuit breaker has Tripped. Shut down the generator set and have service performed as necessary to clear the short circuit or ground fault that caused tripping. Then Reset the circuit breaker and start the set.
THE ENGINE DOES NOT CRANK IN RUN OR REMOTE MODEThe Emergency Stop switch has been used.Pull the Emergency Switch button. To reset the engine control, push the Run-Stop-Remote switch to Stop and the Reset switch to Reset. Then push the Run-Stop-Remote switch to Run.
The Emergency Stop switch has been used.The switch button is lit.Pull the Emergency Switch button. To reset the engine control, push the Run-Stop-Remote switch to Stop and the Reset switch to Reset. Then push the Run-Stop-Remote switch to Run.
A Fault Shutdown is being indicated by one of the red lights on the control panel.Service the set as necessary. To reset the engine control, push the Run-Stop-Remote switch to Stop and the Reset switch to Reset. Then push the Run-Stop-Remote switch to Run.
Cranking voltage is too low to crank the engine.A. Clean and tighten or replace the positive (+) and negative (- ) battery cable connectors and cables at the battery and the set. B. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C).
The engine cranks but does not start.There are multiple possible causes and remedies listed, each with a lettered part: 1. A. Open any closed shutoff valve in the fuel supply system. B. Fill the LPG fuel supply tank if less than half full. On cold days the LPG container may have to be kept at least half full to provide the rate of vaporization required to keep up with generator set demand. LPG with more than 2.5 percent butane will not vaporize in ambients below freezing. Use HD-5 grade LPG. 2. A. Secure the spark plug cables at the spark plugs and at the ignition coil(s). B. Replace the spark plugs and/or cables. 3. Service as necessary. 4. A. Plug in, repair or install engine coolant and engine oil heaters. B. Replace the engine oil if it is not of the recommended viscosity for the ambient temperature.
The engine runs until fault shutdown.There are multiple possible causes and remedies listed, each with a lettered part: 1. The OVERSPEED lamp comes on when the engine shuts down. Have service performed as required. 2. The LO OIL PRES lamp comes on when the engine shuts down. Check the engine oil level, repair any oil leaks and fill to the proper level. Then reset engine monitor board A11 by pushing the Run-Stop-Remote switch to Stop and the Reset switch to Reset. 3. The HI ENG TEMP lamp comes on when the engine shuts down. A. Check the engine coolant level, repair any coolant leaks and refill as necessary. Then reset engine monitor board A11 by pushing the Run-Stop-Remote switch to Stop and the Reset switch to Reset. B. If coolant temperature exceeds 225° F (101° C), clean and service the entire cooling system as required to restore full cooling capacity. 4. The FAULT 1 or FAULT 2 lamp comes on when the engine shuts down. (May be specifically labeled.) Have service performed as required.
The engine lacks power or is unstable.There are multiple possible causes and remedies listed, each with a lettered part: 1. Fuel delivery to the set is inadequate. A. Check for clogged fuel lines and filters. B. Fill the LPG fuel supply tank if less than half full. On cold days the LPG container may have to be kept at least half full to provide the rate of vaporization required to keep up with generator set demand. LPG with more than 2.5 percent butane will not vaporize in ambients below freezing. Use HD-5 grade LPG. 2. The engine air filter element is dirty. Replace the air filter element. 3. A. Secure the spark plug cables at the spark plugs and at the ignition coil(s). B. Replace the spark plugs and/or cables. 4. Service as necessary.
An amber warning lamp is on.1. The PREHET or PRELOP lamp comes on while
THE ENGINE DOES NOT CRANKThe control panel fuse has blown. Cranking voltage is too low to crank the engine.Replace the fuse with one of the same type and amp rating (10 A). If the fuse blows again, look for a loose wire grounded to the block or frame and reconnect or replace it. A. Clean and tighten or replace the positive (+) and negative (- ) battery cable connectors and cables at the battery and the set. B. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). C. If the set is in standby service, install a battery charger.
THE ENGINE CRANKS BUT DOES NOT STARTThe engine is not getting fuel. The spark plug cables and/or spark plugs are loose, fouled or damaged. The air cleaner or exhaust system is blocked. Low engine temperature is causing too low a cranking speed for starting.A. Open any closed shutoff valve in the fuel supply system. B. Fill the LPG fuel supply tank if less than half full. On cold days the LPG container may have to be kept at least half full to provide the rate of vaporization required to keep up with generator set demand. LPG with more than 2.5 percent butane will not vaporize in ambients below freezing. Use HD-5 grade LPG. A. Secure the spark plug cables at the spark plugs and at the ignition coil(s). B. Replace the spark plugs and/or cables. Service as necessary. A. Plug
THE ENGINE RUNS AND THEN SHUTS DOWNLow engine oil pressure, High engine temperatureCheck engine oil level, repair any leaks and fill to the proper level. Check engine coolant level, repair any leaks and fill to the proper level. Clean and service the cooling system as required to restore full cooling capacity.
THE ENGINE LACKS POWER OR IS UNSTABLEFuel delivery to the set is inadequate, The engine air filter element is dirty, The spark plug cables and/or spark plugs are loose, fouled or damaged, The exhaust system is partially blockedCheck for clogged fuel lines and filters. Fill the LPG fuel supply tank if less than half full. On cold days the LPG container may have to be kept at least half full to provide the rate of vaporization required to keep up with generator set demand. LPG with more than 2.5 percent butane will not vaporize in ambients below freezing. Use HD-5 grade LPG. Replace the air filter element. Secure the spark plug cables at the spark plugs and at the ignition coil(s). Replace the spark plugs and/or cables. Service as necessary.
NO OUTPUT VOLTAGEA line circuit breaker is Off, A line circuit breaker has TrippedFind out why the circuit breaker was turned Off, make sure it is safe to reconnect power, and then throw the circuit breaker On. Shut down the generator set and have service performed as necessary to clear the short circuit or ground fault that caused tripping. Then Reset the circuit breaker and start the set.
Control and Diagnostics VIA Network or PC (Laptop) not respondingCheck the network connection, ensure that the control system is powered on, and verify the software settings.
Fault Codes are displayed but no specific troubleshooting steps provided in the Troubleshooting TableRefer to the Fault Code Table for detailed information. If the issue persists, contact technical support.
THE ENGINE RUNS UNTIL FAULT SHUTDOWNThe OVERSPEED lamp comes on when the engine shuts down.Have service performed as required.
Engine lacks power or is unstableFuel delivery to the set is inadequate; The engine air filter element is dirty; The spark plug cables and/or spark plugs are loose, fouled or damaged; The exhaust system is partially blockedA. Check for clogged fuel lines and filters; B. Fill the LPG fuel supply tank if less than half full; Replace the air filter element; A. Secure the spark plug cables at the spark plugs and at the ignition coil(s); B. Replace the spark plugs and/or cables; Service as necessary
An amber warning lamp is onThe PREHET or PRELOP lamp comes on while the engine is running; The LOW FUEL PRESSURE lamp comes on during standby; The LOW ENG TEMP lamp comes on during standby; The FAULT 1 or FAULT 2 lamp comes on during standby (May be a specifically labeled amber lamp)Shut down the set if possible or disconnect non-critical loads. (Oil pressure will be less than 20 psi but greater than 14 psi or engine temperature will be greater than 220° F but less than 230° F); Service the gas supply system as required; Plug in, repair or install an engine coolant heater; Have service performed as required
The green run lamp stays off but the set runs normallyThe set mounted RUN lamp does not light although the starter has disconnected normally and the engine is running; Neither the remote nor the set mounted RUN lamp light although the starter has disconnected normally and the engine is runningPress the panel Lamp Test switch and have the run lamp bulb replaced if it does not light. Test the remote RUN lamp by suitable means and have it replaced if it does not light

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

Parts

250
Part #DescriptionQtySystem
186-6002Gasket PartsGeek
186-6003Bearing, Gear End Main (Standard)Gasket PartsGeek
186-6004Gasket PartsGeek
186-6005Gasket PartsGeek
186-6006Gasket PartsGeek
186-6007Gasket PartsGeek
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186-6017Gasket PartsGeek
186-6019Gasket PartsGeek
186-6020Nut, Hex (M8)Gasket PartsGeek
186-6021Adapter, Oil FilterGasket PartsGeek
186-6022Plug (1/8 - 27 NPTF)Gasket PartsGeek
186-6023Gasket PartsGeek
186-6024Gasket PartsGeek
186-6025Filter, OilGasket PartsGeek
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186-6109Gasket, Cylinder Head1Gasket PartsGeek FridayParts $22.00
186-6112Gasket, Cylinder Head1Gasket PartsGeek FridayParts $32.00
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186-6181Plate, MountingGasket PartsGeek
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186-6183SleeveGasket PartsGeek
186-6184Seal, 'O' RingGasket PartsGeek
186-6185Screw, Cap - Hex Head (M8 x 75mm)Gasket PartsGeek
186-6187Washer, Flat (M8)Gasket PartsGeek
186-6188Stud (M8 x 40mm)Gasket PartsGeek
186-6189Outlet, ThermostatGasket PartsGeek FridayParts $45.99
186-6190GasketGasket PartsGeek
186-6191Screw, Cap - Hex Head (M8 x 60mm)Gasket PartsGeek
186-6198Screw, Cap - Hex Washer Head (M12 x 1.75 x 30mm)Gasket PartsGeek
186-6209Nut, HexGasket PartsGeek
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186-6990Gasket PartsGeek
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186-7055Gasket PartsGeek
186-7057Gasket PartsGeek
186-7059Gasket PartsGeek
186-7066Gasket PartsGeek
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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
Standby100%11.889035667107

Available documents

Parts manual — 0932-0112 Onan Post-Sale Literature Index (07-1998) (Cummins/Onan)Parts manual — 963-0206 Cummins GQKB GQKC Parts Manual (7-2007) (Cummins/Onan)Parts manual — 967-0202 Onan GNAA GNAB GNAC (Spec A-D) Home Standby Genset Parts manual (12-2013) (Cummins/Onan)Parts manual — 967-0202B Onan GNAA GNAB GNAC (Spec A-B) Home Standby Genset Parts manual (12-1999) (Cummins/Onan)Service manual — 967-0110 Onan GNAA GNAB GNAC Genset Operators manual (10-1997) (Cummins/Onan)Service manual — 967-0112 Onan GNAA GNAB GNAC Genset Operators manual (12-2002) (Cummins/Onan)Service manual — 967-0113 Onan GNAA GNAB GNAC Genset (w-PCC1301 PowerCommand) Operators manual (12-2005) (Cummins/Onan)Service manual — 967-0601 Onan GNAA GNAB GNAC Genset Install manual (03-2003) (Cummins/Onan)Service manual — 967-0603 Onan GNAA GNAB GNAC Genset Install manual (12-2002) (Cummins/Onan)Service manual — 967-0604 Onan GNAA GNAB GNAC Genset (w-PCC-1301 PowerCommand) Install manual (12-2005) (Cummins/Onan)

Other sets with this engine

Cummins/Onan GNABCummins/Onan GNAC