Here at our shop we service all makes and models of Onan Generators. Keeping up on your hourly services is the best thing you can do to get the most hours out of your generator. Contact us today for all your servicing needs!

Scroll to the bottom of this page for Generator Maintenance

The Standard in RV power. 

For more than 80 years, when you’ve been ready to hit the road in your RV, so have we. Green Onan generators are built to last—enabling peace of mind no matter where your travels take you. And with the industry’s largest service network stretching across all 50 states and Canada, support is always nearby. Keep moving with Cummins.

Onan QG 4000 for RV

Ideal for light and medium-duty applications with small size and weight constraints. Features exceptionally quiet operation, single-side servicing, and an enclosed muffler.

  • Suitable for medium-duty commercial mobile applications
  • Microprocessor control with diagnostics
  • Smooth, quiet operation
  • Sealed connectors
  • Full housing with enclosed muffler
  • Lightweight, compact
  • Overhead valve engine
  • One-year/1000-hour limited warranty (commercial)
  • ** Indicates Factory OEM packaging

Onan QD 6000 for RV

Runs two air conditioners with power to spare. Quieter than National Park Service sound level requirements.

  • Computer-controlled variable speed operation matches engine speed to load demand, minimizing noise level.
  • Special sound-controlling housing encloses cooling system and muffler.
  • Three-point, fully focalized mounting system reduces vibration.
  • Self-diagnostic capabilities simplify troubleshooting.
  • Easy, accessible maintenance points
  • Runs two 15000 Btu air conditioners with power to spare.
  • High quality, pure sine wave electrical output helps prevent damage to appliances.

Onan Maintenance

RV QG (Gasoline)

  • Clean and check battery and connections monthly. Do this more often if operating in dusty environments.
  • Clean spark arrester every 50 hours. Perform sooner if engine performance deteriorates.
  • Change oil and oil filter every 150 hours. Perform more often if operating in dusty environments or hot weather. This should be performed at least once a year.
  • Change the air filter every 150 hours. Perform more often when operating in dusty environments. Perform sooner if engine performance deteriorates.
  • Replace spark plugs every 450 hours. Perform sooner if engine performance deteriorates.
  • Change the fuel filter every 450 hours. Perform sooner if engine performance deteriorates.
    • Check fuel quality monthly and add fuel stabilizer, like OnaFresh, for prolonged storage.
  • Schedule Cummins service center tune-up every 450 hours. 

RV QD (Diesel)

  • Clean and check battery connections monthly. Do this more often when operating in hot weather.
  • Change oil and oil filter every 150-250 hours. Perform more often when operating in dusty environments and hot weather. This should be performed at least once a year.
  • Change the air filter every 500 hours. Perform more often when operating in dusty environments and sooner if the engine performance deteriorates.
  • Flush the coolant system every 1,000 hours.
  • Change the fuel filter every 500 hours. Perform sooner if engine performance deteriorates. 
    • Check fuel quality monthly and add fuel stabilizer, like OnaFresh, for prolonged storage.

Dos and Don’ts 

To keep your Onan generator running at its highest potential and running for as long as possible, follow these general dos and don’ts.

DO

  • Keep your generator clean by wiping it periodically with a clean cloth
  • Turn off all appliances before starting your generator for best long-term performance
  • Stay up to date on maintenance schedule
  • Check exhaust system regularly for damage or leaks
  • Check air filter periodically and clean it tapping it on a flat surface
  • Install a running hour meter, if not already present
  • Exercise your generator for a few hours every month with a load
  • Make sure that clean fuel is used, and for prolonged storage or inactivity be sure to add OnaFresh fuel stabilizer to avoid damage caused by bad fuel
  • Change your fuel filter. This is often forgotten about 

Your fuel filter is very important as it removes bits of debris from the fuel to prevent clogging the carburetor jets. In time, however, it collects enough material to become plugged. This restricts fuel flow and reduces the generator’s power delivery.

It is recommended to always have a spare set of filters, oil, and belts on hand in case of an emergency.

DON’T

  • Don’t run the generator for long periods of time without using it to power appliances
  • Attempt to adjust the carburetor, governor, choke, etc. yourself. See your Cummins authorized RV service and parts dealer for assistance
  • Run your generator set with the generator door panel removed
  • Run your generator on roads when there is heavy pooling of water

Never settle when it comes to buying parts for your Onan generator. Choose the parts designed to the exact product specifications, shop for Onan Green Label Parts.

For more information on how to operate and maintain your Onan generator, you can download our RV Handbook. Please visit https://www.cummins.com/generators/rv-generators, select “Manuals & Helpful Publications,” then click on “RV Handbook.” You will also find other helpful information such as user manuals, dealer director, parts reference guide, etc. to download.