When your old RV Onan quits—maybe right in the middle of your trip—this direct replacement brings back quiet, reliable power for your RV AC, fridge, and more, so you can keep exploring with all the comforts of home, no hookups required.
If your old generator finally gave out, this Onan QD 8000 fits in the same spot as your original. You'll still need to hook up the fuel line, electrical, and exhaust, but the major work is already done for you. Enjoy the comforts you count on—morning coffee, fully charged devices, and lights on at any hour. Plus, it has enough power to run two 15,000 BTU air conditioners at once, so you can beat the summer heat and stay comfortable wherever you park.
After a long drive or when the weather turns wet and rainy, nobody wants to wrestle with a bulky generator. With one-touch start, automatic timed glow plugs, and remote switching capability, powering up is always simple, rain or shine. All you have to do is press the power button and relax. And the built-in shutoffs handle low oil, overloads, and engine quirks automatically, so you can settle in for the night with your fridge cold, your CPAP on, and no worries about unexpected shutdowns.
This generator uses sound-dampening technology and a special muffler to help keep things peaceful. You won't have to raise your voice for campfire stories, cut conversations short, or lose sleep to engine noise. It also meets National Park Service noise guidelines, so you can experience brilliant fall foliage in the Great Smoky Mountains or visit the steaming geysers at Yellowstone without worry.
From routine oil changes to swapping out the air filter, service is straightforward. No need to be a mechanic—just basic tools and a few minutes are all it takes to keep things running strong for years to come. And with built-in self-diagnostic capability, troubleshooting issues is faster and easier so you can spend less time on maintenance.
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If you are a full-time RVer, running a big rig with two A/Cs, or just want a no compromise diesel generator that is built for the long haul, the Onan QD 8000 is a solid choice. It gives you all the power you need for boondocking or staying off grid, with the quiet and reliability you expect from Cummins.
It puts out 8000 watts, runs on diesel, and powers two 15000 BTU A/Cs, your fridge, microwave, and more. It is a fixed mount generator made to drop right in where your old one was.
Starting is easy. Just hit a button. It uses automatic glow plugs, so it warms itself up and starts smooth, even in cold weather.
It is quiet for its size, with soundproofing, an enclosed muffler, and a vibration control system. It also comes with a USDA spark arrestor muffler, so it is ready for national parks and forests with no extra mods needed. You will never have to worry about being the guy with the loud generator at the campground again.
Maintenance is simple, with easy oil changes, filter swaps, and built in self diagnostics to make troubleshooting quick.
If your diesel Class C or Super C came from the factory with an Onan 8kW Quiet Diesel, the CM44RR is the exact part you’re looking for. It’s a direct replacement, same performance, same footprint, same rock-solid reliability. You’re not reinventing the wheel here, just putting a better version of it back in place.
It’s the same footprint as the factory QD 8000, so you’re not cutting sheet metal or crawling under your RV with a tape measure and a prayer. It bolts in, hooks up to the existing diesel fuel line, and just works. Exhaust hookup and control wiring usually line up without a fight especially if you’ve still got your OEM harness in good shape.
You get 8,000 watts of 120V output, which is plenty for two rooftop A/Cs, your fridge, microwave, and a battery charger running in the background.
And it’s quiet, well, quiet for a diesel. Once you’ve got it mounted and the compartment closed, it’s more of a deep hum than anything disruptive. If you’ve got a coach that came with a QD 8000, this isn’t an upgrade it’s a smart swap.
Get the power you’re used to, minus the headaches of refitting your bay or redoing connections. Just solid power, ready to roll.
Let me put it this way: if your Class C motorhome came with an Onan 8kW generator and your kids sleep directly above the generator bay, the CM44RR is the direct replacement that won’t shake the walls or your sanity.
It’s a direct replacement. That alone makes it a win, but what makes it a real win? It’s shockingly quiet for a diesel. It hums along under load without that high-pitched rattle that’ll ruin bedtime.
I’ve got two toddlers. If a generator dares to start rumbling under nap time, the whole campground knows. With the CM44RR, you’ve got that quiet diesel technology that runs smoother and quieter than the older models.
It’s everything you liked about the original QD 8000, but cleaner, quieter, and easier to live with.
If your diesel Class C motorhome—like a Jayco Seneca, Dynamax Isata 5, or Nexus Rebel originally came with an 8kW Onan generator, the CM44RR is the go-to replacement. It shares the exact same mounting footprint as the original QD 8000, so installation is refreshingly straightforward. No bay modifications, no custom brackets—just drop it in, hook it up to your diesel line, and you’re good to go.
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