When you buy your RV parts from Cummins, you’re ensured reliability and durability when you need it most. Don't settle for the sub-par quality of off-brand parts. With genuine parts, your generator’s performance will be optimal every time you use it.
RV Manuals
Looking for RV generator manuals? Some of our most popular operators and installation manuals are now available for direct download.
Routine maintenance, whether it’s do-it-yourself or a certified professional, will help ensure that the RV is working properly at all times. There are a few common parts that will need to be checked during the maintenance process.
- Air filters: Genuine Cummins air filters are designed with a special foam pre-cleaner, for use specifically in RV generators. Other manufacturers' air filters may contain a lighter-density filter paper and the sealing surfaces may get hard and crack over time, allowing dirty air into the engine intake system. Over time it takes about a thimbleful of dirt to wear out piston rings and cylinders. (Replacement filters for some older models may not include the pre-cleaner.)
- Spark plugs: Genuine Cummins spark plugs come gapped correctly from the factory for your RV generator engine. Spark plugs purchased from other sources come gapped for automotive engines, which are gapped much larger. When regapping, the ground strap must be bent and it may not cover the entire electrode which will reduce spark plug life.
- Oil filters: Cummins RV oil filters feature valves that allow oil to bypass the oil filter during cold starts, or if the filter becomes plugged. Other manufacturers' oil filters often do not have bypass valves. As these "will-fit" filters trap debris, oil pressure starvation can occur, leading to high oil pressures, failed gaskets and even engine damage. Other "will-fit" oil filters do contain bypass valves but they do not determine at what PSI the valve opens. If the setting is too high, the filter's paper element can be damaged during a cold start rendering it useless, or cause oil starvation to the engine.
Watch our helpful video for information on top tips for RV Generator Maintenance.
For customers in the U.S. and Canada, shop.cummins.com offers a wide selection of Onan RV Generator Parts available for purchase online.
If you prefer full service from a local shop, please check our locator to find the authorized dealer nearest you.
Get the most out of your Cummins RV Generator by accessing resources such as maintenance how-to videos, manuals and more. These tools help you learn where to find specs and serial number information for determining which parts to use for service and repair as well as basic maintenance tips.
Whether you’re changing the oil yourself or need to check the specs on your generator, there are digital manuals and spec sheets available for quick and easy download.
Learn more about Cummins RV generators
Tough and quiet
Cummins RV generators are among the toughest and quietest options on the market today. With the proper care, you can expect your Cummins RV generator to last for many years to come.
RV Generator Warranty
There are outstanding warranty options offered by Cummins. We make sure you are covered so you can maintain your peace of mind.
Widely available support
You receive unmatched support when you have a Cummins RV generator. From certified local dealers to Cummins Care, we are here to guide you through any challenges.
Find an RV generator service location near you
Not interested in doing it yourself? A certified RV service provider can quickly and professionally help you with maintenance and part replacement.
Cummins RV generator service FAQs
To start:
- Press and hold START at the interior control panel or outside at the set until the unit starts and the run indicator light comes on.
- Quiet Diesel: When you press START, the control verifies several parameters, including temperature. Glow plug burn and fuel pump prime happen prior to the starter engaging. On a cold morning, this “prime” could take up to 30 seconds before you hear the starter engage (this is normal.)
- Don’t over-crank with no start-crank no longer than 20 seconds; allow the starter to cool for at least two minutes between attempts.
- Allow generator to run for 30 seconds prior to applying large loads. In many cases, the RV’s automatic transfer switch has this delay built in.
To stop:
- Press the STOP button at the control panel or at the set. It is a good practice to turn off air conditioners and large electrical loads and allow the generator to run for three to five minutes prior to stopping. This allows the generator to cool down.
You can run your generator as long as you need to as long as your fuel lasts, depending on the load. The breaker will automatically flip if it becomes overloaded.
Every year or every 150 hours, whichever comes first.
