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Cummins Onan Parts

Genuine Cummins Onan Green Label Parts to suit RV QG Models and many others. They are available from all Macfarlane Generators branches. We are the largest certified Cummins Onan RV service and parts dealers in Australia.

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We stock genuine Cummins Onan parts across all three branches, with the ability to dispatch to anywhere in Australia and the South Pacific region. 

Make sure you know the difference between genuine parts and 'will-fit' parts! Don't settle for aftermarket (will-fit) parts. Genuine Cummins onan parts offer the durability and performance you've come to expect from the company. They're the originals. 

The following includes some of the parts you'll become accustomed to checking and changing as part of your maintenance routine, as well as the reasons for choosing Cummins Onan parts:

Air Filters

Genuine Cummins Onan air filters are designed with a special foam pre-cleaner for sure specifically in RV generators. Other manufacturer's 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. It only takes about a thimbleful of dirt to wear out piston rings and cylinders.

Please note: Replacement filters for some older models may not include the pre-cleaner. 

Spark Plugs

Genuine Cummins Onan spark plugs come gapped correctly from the factory for your RV generator engine. Spark plugs purchased from other sources come gapped for automatic engines, which are gapped much larger. When regapping, the ground strap must be bent and it may not cover the entire electrode, reducing spark plug life. 

Oil Filters

Cummins Onan RV oil filters feature valves that allow oil to bypass the oil filter during cold starts or if the filter becomes plugged. Other manufacturer's 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.