Service parts for the G855 Series
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredBelts
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
for the Cummins/Onan G855| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | filter element, NG | 05e00009 | Amazon eBay | ||
| Fuel filter | Install a new filter element and replace the filter cover using a new o-ring seal. | — | 1500 hr | ||
| Oil filter | 7/16 capscrews, 3/8 capscrews | — | 1500 hr | ||
| Battery | Disconnect the batteries, Slowly close the manual gas supply valve. | — | 1500 hr | ||
| Belt | Drive Belt, Cooling Fan | 17900012 | 1500 hr | Amazon eBay | |
| Coolant filter | — | 1500 hr | |||
| Oil | Lubricating Oil Level | — | 250 hr | ||
| Spark plug | Adjust the exhaust oxygen by turning the power valve on the carburetor. | — | 1500 hr |
Common questions
What engine is in the Cummins/Onan G855 Series?
The Cummins/Onan G855 Series is powered by the Cummins/Onan G855 engine.
Which air filter part number does the Cummins/Onan G855 Series take?
The Cummins/Onan G855 Series uses air filter part number 05e00009.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Coolant Loss - External | Radiator cap is not correct, is malfunctioning, or has low-pressure rating | Check the radiator pressure cap. Refer to the OEM service manual. |
| Coolant Temperature Above Normal - Gradual Overheat | Coolant level is below specification; Lubricating oil level is above or below specification; Load is excessive for engine horsepower rating; Coolant temperature gauge is malfunctioning; Radiator fins are damaged or obstructed with debris; Radiator cap is not correct, is malfunctioning, or has low-pressure rating; Cooling system hose is collapsed, restricted, or leaking | Inspect the engine and cooling system for external coolant leaks. Repair if necessary. Add coolant.; Beene enannne Check the oil level. Add or drain oil, if necessary.; Refer to Procedure 007-043 (Lubricating Oil Level) in Sections 3 and Procedure 007-002 (Lubricating Oil and Filters) in Section 4.; Reduce the load on the engine. Refer to OEM specifications.; Test the temperature gauge. Repair or replace the gauge if necessary. Refer to the OEM service manual.; Inspect the radiator fins. Clean and repair the fins as necessary. Refer to the OEM service manual.; Check the radiator pressure cap. Refer to the OEM service manual. |
| Coolant Temperature Below Normal | Engine is operating at low ambient temperature | OK |
| Engine Decelerates Slowly | Compare the calibration in the electronic control system with the engine rating and the Control Parts Electronic control module system calibration is |............ List (CPL), Bulletin number 3379133 or 4021327. If not correct necessary, calibrate the system. | Refer to a Cummins Authorized Repair Facility. |
| Throttle plate is malfunctioning | Refer to a Cummins Authorized Repair Facility. | |
| Engine Difficult to Start or Will Not Start | STEP 1 Check the OEM fuel shutoff valves. Verify that the OEM manual fuel shutoff valve is closed fuel tanks are open. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan G855 Series troubleshooting guide (18 entries) →
Parts
34| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 03100050 | Rocker lever cover gasket | 1 | Gasket | Amazon eBay |
| 03100052 | Rocker lever cover gasket | 1 | Gasket | Amazon eBay |
| 03100058 | Overhead Set | Overhead set | Amazon eBay | |
| 03100063 | Rocker Lever Cover | Rocker lever cover | Amazon eBay | |
| 03100064 | Rocker Lever Cover | Rocker lever cover | Amazon eBay | |
| 03100066 | Rocker Lever Cover | Rocker lever cover | Amazon eBay | |
| 03100067 | Rocker Lever Cover | 5 | Rocker lever cover | Amazon eBay |
| 03100069 | Rocker Lever Cover | Rocker lever cover | Amazon eBay | |
| 03900242 | Coolant Filter | 1 | Filter | Amazon eBay |
| 03900243 | Coolant Filter | 1 | Filter | Amazon eBay |
| 03900244 | Coolant Filter | 1 | Filter | Amazon eBay |
| 03900245 | Coolant Filter | 1 | Filter | Amazon eBay |
| 05e00009 | filter element, NG | Air filter | Amazon eBay | |
| 06400190 | Air/fuel mixer power valve | 1 | Power valve | Amazon eBay |
| 06600154 | Air cleaner tube | 1 | Air cleaner | Amazon eBay |
| 081000714 | RESTORE™ CC2610 1 - Gallon | Fluid | Amazon | |
| 08400269 | Spark Plug Wire | 1 | Spark plug | Amazon eBay |
| 08900235 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 08900236 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 089002397 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 08900246 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 08900247 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 09900238 | Low-Temperature Aftercooler (LTA) Water Pump | 1 | Pump | Amazon eBay |
| 10200031 | Fan, Cooling | Fan | Amazon eBay | |
| 17900012 | Drive Belt, Cooling Fan | Belt | Amazon eBay | |
| 0500007 | filter cover | Service part / kit | Amazon Amazon eBay | |
| 08100072 | Belts | Service part / kit | Amazon eBay | |
| 08100073 | Catalytic Converters | Service part / kit | Amazon eBay | |
| 08100074 | Clutches | Service part / kit | Amazon eBay | |
| 08400190 | capscrew, 7/16 | Service part / kit | Amazon eBay | |
| 08600155 | capscrew, 3/8 | Service part / kit | Amazon eBay | |
| 08600156 | capscrew, 7/16 | Service part / kit | Amazon eBay | |
| 3376592 | Inch Pound Torque Wrench | 1 | Service part / kit | Amazon $380.14 eBay $174.95 KuduParts $359.00 |
| 3822735 | Plastic bead blasting media | 1 | 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.
Available documents
Service manual — Cummins Diesel G855 Manual 2006 (2) (Cummins/Onan)Service manual — Cummins Gas G855 Manaul 2004 (2) (Cummins/Onan)