Service parts for the C36 N6
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | natural gas / propane (field selectable) |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 36 kW |
| Standby kVA | 36 |
| Controller | PowerCommand (HMI211 operator), PowerCommand 1.1 |
| Oil capacity | 4.3 L |
| Alternator | Brushless, 2-pole rotating field, single bearing (2-pole) |
| Voltage options | 120/240 V, 120/208 V, 277/480 V |
| Phase | 1 or 3 |
| Rated current | 150.0 A |
| Power factor | 1.0 |
| Circuit breaker | 175 A |
| Battery group | ['26 standard', '34 high capacity'] |
| Battery cranking | 550 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Starting system | 12 V DC |
| Coolant capacity | 50 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2388×864×1156 mm |
| Dry weight | 587 kg |
| Wet weight | 587 kg |
| Sound level | 63.0 dBA @ 7 m |
Engine
| Coolant capacity | 12.8 L |
|---|---|
| Displacement | 2.4 L |
| Aspiration | Naturally aspirated or turbocharged (varies by generator set model) |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan QSJ2.4| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Preventive Maintenance Kit –Heavy Duty | A046N983 | Amazon eBay | ||
| Fuel filter | Every 500 hours of operation or as needed, whichever comes first | — | 500 hr | ||
| Oil filter | Large, Oil Cooler | CA135-E12 | Amazon eBay | ||
| Battery | As needed | — | |||
| Oil | 500 miles or 6 months, whichever comes first | — | 804 hr |
Service intervals
30| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Air cleaner restriction indicator (where fitted) | Check | 24 hr | Daily or after 24 hours, whichever occurs first. If indicator shows red, replace air cleaner elements and reset indicator. | |
| Air intake system | Inspect | 24 hr | Daily or after 24 hours. Visually and audibly check for leaks, wear or damage. | |
| Batteries - connections secure and battery area clear | Check | 24 hr | Daily or after 24 hours and Weekly or after 50 hours. | |
| Coolant level of radiator(s) (water jacket & LTA) | Check | 24 hr | Daily or after 24 hours. Top up with Cummins recommended coolant mix if low. | |
| Engine oil level | Check | 24 hr | Daily or after 24 hours. Top up to engine specifications level with recommended oil. | |
| Exhaust components and hardware (fittings, clamps, fasteners) | Inspect | 24 hr | Daily or after 24 hours and Weekly or after 50 hours. Visually and audibly inspect for wear or damage. | |
| Generator set enclosure | Check | 24 hr | Daily or after 24 hours. Walk-around inspection; ensure no inlets/outlets restricted and safety systems in place. | |
| Operator panel | Check | 24 hr | Daily or after 24 hours. Replace component if not functioning properly. | |
| Battery condition | Check | 50 hr | Weekly or after 50 hours. | |
| Charge alternator | Check | 50 hr | Weekly or after 50 hours. Check visually and audibly when generator set is running. | |
| Coolant lines and radiator hoses | Check | 50 hr | 12 mo | Weekly or after 50 hours and 12 Months or after 200 Hours. Check for leaks, wear and cracks. |
| Cooling fan blades | Inspect | 50 hr | Weekly or after 50 hours. Visually inspect for wear or damage. | |
| Drive belt, condition and tension | Check | 50 hr | Weekly or after 50 hours. Check for wear or slippage. | |
| Emergency Stop Button (where fitted) | Test | 50 hr | Weekly or after 50 hours. With generator set running, press Emergency Stop button. | |
| Fuel lines and hoses | Check | 50 hr | Weekly or after 50 hours. Visually check for leaks, wear or damage. | |
| Radiator air flow | Inspect | 50 hr | Weekly or after 50 hours. Check for blockage, debris, wear or damage. | |
| Air cleaner | Replace | 100 hr | Replace air cleaner. | |
| Aftercooler core (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Coolant heater (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. Check it has power and is running. |
| Electrical connections (battery, starter motor and alternator connections) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Engine ground | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. Clean as necessary. |
| Engine mounts | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Engine oil and filters | Replace | 200 hr | 12 mo | First service — After the initial 50 hour interval and every 200 hours thereafter; 12 Months or after 200 Hours. |
| Radiator core | Clean | 200 hr | 12 mo | 12 Months or after 200 Hours. Cleaning schedule may be reduced depending on operating conditions/environment. |
| Spark plugs | Inspect | 200 hr | 12 mo | 12 Months or after 200 Hours. Replace as necessary. |
| Starting motor | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Timing belt condition | Inspect | 200 hr | 12 mo | 12 Months or after 200 Hours. Visually inspect. |
| Turbocharger (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Water pump | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Cooling system coolant | Replace | 24 mo | 2 Years. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
10| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap (NA) | 0.040 | inch (1.0 mm) | |
| Gap | Spark plug gap (T/TAA) | 0.030 | inch (0.76 mm) | |
| Other | Maximum I2 (negative sequence) | 8 | % | |
| Pressure | Engine oil pressure low (shutdown) threshold - Code 415 | 26 | psig (180 kPa) | for greater than 10 seconds |
| Resistance | Engine harness pin resistance (ECM to sensor) - Code 5569 diagnosis | 5 ohms or less | ohms | |
| Speed | Endurance run period (normal duty air cleaner test) | 30 | seconds | after oil/filter change, run then shut off and wait 5 minutes |
| Temperature | Engine coolant temperature above normal (warning) - Code 146 | 225 | °F (107.2 °C) | for greater than 5 seconds |
| Temperature | Intake manifold temperature high (shutdown) - Code 155 | 203 | °F (95 °C) | for greater than 10 seconds |
| Temperature | Intake manifold temperature high (warning) - Code 488 | 185 | °F (85 °C) | for more than 90 seconds |
| Torque | Spark plug torque | 15 | ft-lb (20 N-m) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50/50 | 50/50 ethylene glycol/water mixture | |||
| Coolant | 50/50 mixture | below 50°C | |||
| Coolant | Cummins recommended coolant mix | Top up coolant system to specifications level with Cummins recommended coolant mix. For NFPA 110 applications a coolant heater is required. | |||
| Engine oil | 5W30 API SM | API SM | 4.3 L | Approximately 4.5 quarts (4.3 L). Dipstick High mark 4.3 L (4.5 qt), Low mark 3.8 L (4.0 qt). | |
| Fuel | Natural gas or propane vapor | Fuel pressure 6-14 inch water column. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
13| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 143 | Engine Oil Pressure Low | Engine oil pressure is below the low oil pressure warning threshold. | Warning | Check the oil level and add oil if necessary. Inspect the engine and surrounding area for external oil leaks; contact your local dealer if a leak is present. |
| 1438 | Fail to Crank | The engine failed to crank after the generator control received a start signal. | Shutdown | Verify battery voltage is at least 12 VDC. Charge or replace the battery as necessary. |
| 146 | Engine Coolant Temperature Above Normal | Engine coolant temperature has exceeded 225 °F (107.2 °C) for greater than 5 seconds. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; inspect/clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 1472 | High AC Current | The generator output current has exceeded at least 150% of rated current. | Shutdown | Reduce the generator set load by powering off unnecessary household appliances. |
| 151 | Engine Coolant Temperature High | Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Shutdown | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 155 | Intake Manifold Temperature High | Engine intake manifold temperature has exceeded 203 °F (95 °C) for greater than 10 seconds. | Shutdown | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 197 | Coolant Level Low | Coolant level sensor signal is showing a low coolant level for greater than 10 seconds. | Warning | Remove radiator cap and check that coolant is up to the required level. |
| 415 | Engine Oil Pressure Low | Engine oil pressure is below 26 psig (180 kPa) for greater than 10 seconds. | Shutdown | Check the oil level and add oil if necessary. Inspect the engine and surrounding area for external oil leaks; contact your local dealer if a leak is present. |
| 421 | Engine Oil Temperature High | The control has detected the engine oil temperature has exceeded the warning threshold. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; inspect/clear enclosure air intake blockage; check and add coolant. |
| 441 | Battery Voltage Low | Battery voltage low. | Warning | Inspect the battery cable connections for corrosion and for loose connections. |
| 488 | Intake Manifold Temperature High | Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 5134 | Unknown Shutdown at Idle | The generator set failed to start. | Shutdown | Check that the manual shutoff valves are open (fuel supply issue). |
| 5569 | Engine Combustion | Rapid rate of increase of intake manifold temperature detected. | Shutdown | Inspect hose couplings between compressor outlet and intake manifold; inspect the turbocharger; inspect the mixer; check the TMAP sensor value with GCP Display service tool or InPower; inspect the engine harness and connector pins (resistance should be 5 ohms or less) and repair or replace as necessary. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
11Check the fault log diagnostic
- From any Information Menu, hold down the up and down arrows simultaneously for two seconds to access the Service Menu.
- Select Fault History.
- Active faults are displayed first, followed by Fault History screens newest to oldest.
Adding oil maintenance
⚠ Too much oil can cause high oil consumption. Too little oil can cause severe engine damage.
⚠ Hot engines can burn you. Ensure that the generator set engine has cooled down before adding or draining the oil.
- Ensure that the oil fill cap area is clean, and prevent debris from entering the engine.
- Add the appropriate amount of oil, based on the engine oil level check performed beforehand.
- Recheck the engine oil level. Based on the results, add or drain oil.
- Clean up and dispose of any oil in accordance with local/state regulations.
Air cleaner element removal and installation (Heavy Duty) maintenance
- Wipe dirt from the cover and upper portion of the air cleaner.
- Lift tab and turn end cover counter clockwise.
- Pull the end cover away from the housing.
- Remove the media from the housing.
- To install: insert the media into the housing, install the end cover onto the housing, turn clockwise until the latch snaps into place.
Air cleaner removal and installation (Normal Duty) maintenance
⚠ Holes, loose-end seals, dented sealing surfaces, corrosion of pipes render the air cleaner inoperative and require immediate element replacement.
- Loosen the strap clamp.
- Wipe away debris around the air cleaner connection to the engine.
- Remove the dirty cleaner and dispose of the dirty element per local requirements.
- To install: install the air cleaner and tighten the strap clamp.
Changing engine oil and oil filter maintenance
⚠ Used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation, ingestion, and prolonged contact.
⚠ Avoid direct contact of hot oil with your skin.
- Operate the engine until the water temperature is approximately 60 °C (140 °F).
- Shut down the engine.
- Drain the oil.
- Remove the oil filter and clean the filter mounting surface; remove the old gasket if it remains.
- Make sure the gasket is in place on the new filter, apply a thin film of clean oil to the gasket, install until the gasket just touches the block, then turn an additional 1/2 to 3/4 turn.
- Refill with oil until full.
- Start and run for 30 seconds.
- Shut the engine off and wait 5 minutes.
- Check the engine oil level.
- Dispose of the used oil and oil filter according to local environmental regulations.
Check the engine oil level maintenance
⚠ Crankcase pressure can blow out hot oil and cause severe burns. Do NOT check oil while the engine is operating.
- Pull out the dipstick and wipe it clean.
- Clean off the area surrounding the dipstick port to prevent entry of debris into the oil pan.
- Make sure that the engine has not been running for approximately five minutes.
- Reinsert and fully seat the dipstick.
- Remove the dipstick and check the oil level.
- Reinsert and fully seat the dipstick.
Draining oil maintenance
⚠ Ensure that the generator set engine has cooled down before adding or draining the oil.
- Detach the oil drain hose from the side of the engine.
- Place the end of the drain hose into an appropriate container.
- Open the oil drain valve to release oil from the engine into the container.
- Recheck the engine oil level. Based on results, add or drain oil.
- Close the oil drain valve, wipe it clean, and re-attach the drain hose.
- Dispose of the used oil in accordance with local/state regulations.
Exercise settings - update exercise frequency operation
- Press Exercise Schdr on the Daylight Saving Adjust End Menu.
- Press Adjust.
- Use + or - keys to edit Schdr Enable, Exercise Schedule, and Day/Hours/Minutes/AM-PM.
- Press Save to save any changes.
Screen brightness and contrast adjustment operation
- From any Information screen, hold down the up and down arrows simultaneously for two seconds to access the Service Menu screen.
- Select Screen Adjust.
- Select Adjust to access the screen variables.
- Press the right arrow to move between variables.
- Adjust settings, and press Save to save any changes.
Set up the clock (Time Setup) operation
⚠ When battery power is lost, these settings must be reset.
- Access the Time Setup Menu by selecting Clock Exerciser on the Genset Service Menu.
- Select Adjust.
- Use the right arrow to select blocks and + or - keys to adjust values.
- Press Save to save any changes.
Update exercise duration operation
- Press the down key on the Exercise Schdr Menu.
- Press Adjust.
- Use the horizontal right arrow key to select the duration block.
- Use the + or - keys to edit the exercise duration minutes.
- Press Save to save any changes.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
How many kW is the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 is rated 36 kW standby (36.0 kVA).
Which engine powers the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 is powered by the Cummins/Onan QSJ2.4 engine.
What kind of fuel does the Cummins/Onan C36 N6 run on?
The Cummins/Onan C36 N6 runs on natural gas / propane (field selectable).
What is the coolant capacity of the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 cooling system holds 50 liters (13.2 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the oil capacity of the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 has an engine oil capacity of 4.3 liters (4.5 US quarts), per the manufacturer specification sheet.
How loud is the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 is rated at 63.0 dBA at 7 m, per the manufacturer specification sheet.
How much does the Cummins/Onan C36 N6 weigh?
The Cummins/Onan C36 N6 has a dry weight of 587 kg (1294 lb).
What voltages is the Cummins/Onan C36 N6 available in?
The Cummins/Onan C36 N6 is offered in 120/240 V, 120/208 V, 277/480 V, 1 or 3-phase.
What size battery does the Cummins/Onan C36 N6 need?
The Cummins/Onan C36 N6 uses 1 battery, 12 V each, 550 CCA, group ['26 standard', '34 high capacity'], per the manufacturer specification sheet. The starting system is 12 V DC.
Which alternator is fitted to the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 uses a Brushless, 2-pole rotating field, single bearing alternator. It has 2 poles.
Which oil filter part number does the Cummins/Onan C36 N6 take?
The Cummins/Onan C36 N6 uses oil filter part number CA135-E12.
What air filter fits the Cummins/Onan C36 N6?
The Cummins/Onan C36 N6 uses air filter part number A046N983.
Troubleshooting
5Fault codes
| Code | Meaning |
|---|---|
| Code 143 | Engine Oil Pressure Low (Warning) |
| Code 146 | Engine Coolant Temperature Above Normal (Warning) |
| Code 151 | Engine Coolant Temperature High (Shutdown) |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Any spillage that occurs during fueling or during oil top-off or oil change must be cleaned up before starting the generator set. | Clean up any spillage before starting the generator set. | |
| Fire Hazard | Contaminated insulation is a fire hazard. | Remove any contaminated insulation and dispose of it in accordance with local regulations. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
9- Air cleaner element removal and installation (Heavy Duty)
- Air cleaner removal and installation (Normal Duty)
- Check the engine oil level
- Check the fault log
- Draining oil
- Exercise settings - update exercise frequency
- Screen brightness and contrast adjustment
- Set up the clock (Time Setup)
- Update exercise duration
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
13| Part # | Description | Qty | System | |
|---|---|---|---|---|
| A046N983 | Preventive Maintenance Kit –Heavy Duty | 2 | Air filter | Amazon eBay |
| A046N985 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| A046N987 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| CA115-T12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| CA135-E12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| A046J612 | Base Barrier – Elevated Genset | 1 | Service part / kit | Amazon eBay |
| A046L270 | Instruction Sheet | 1 | Service part / kit | Amazon eBay |
| CA115-H14 | Small | Service part / kit | Amazon eBay | |
| CA115-J12 | Small | Service part / kit | Amazon eBay | |
| CA115-L14 | Small | Service part / kit | Amazon eBay | |
| CA115-M12 | Large | Service part / kit | Amazon eBay | |
| CA115-P12 | Large | Service part / kit | Amazon eBay | |
| CA115-R12 | Large | Service part / kit | Amazon eBay |
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
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Standby | 25% | 8.33 | 2.2 |
| Standby | 50% | 12.11 | 3.2 |
| Standby | 75% | 15.52 | 4.1 |
| Standby | 100% | 19.31 | 5.1 |
Available documents
Spec sheet (Cummins/Onan)Spec sheet — NAS-5692-EN (Cummins/Onan)Spec sheet — NAS-5706-EN (Cummins/Onan)Spec sheet — NAS-5777-EN (Cummins/Onan)Spec sheet — NAS-5790-EN (Cummins/Onan)Spec sheet — eds-1169 (Cummins/Onan)Spec sheet — epa-1239 (Cummins/Onan)Operator's manual — 2929 rx powerconnect operatormanual (Cummins/Onan)Parts manual — 77789-1301Parts manual — NAACSB-6026-EN (Cummins/Onan)Service manual — 8023 rx powerconnect installmanual (Cummins/Onan)Service manual — C30N6 Service Manual (Cummins/Onan)Service manual — QSJ2.6 Generator Set Operator Manual (Cummins/Onan)Service manual — cummins-rs30-208-owners-manual (Cummins/Onan)
This page was generated from the 14 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.