Cummins Onan Generators
- CM74RR
- No Inverter
- Diesel
- Cummins Onan
- Fixed Mount
- 120 Volt Output
- 240 Volt Output
- 12500 Running Watts
- Electric Start
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.
Highlights
- Direct Replacement: Installs where your old Onan sat—no odd adapters needed.
- Instant Power On Demand: Reliable one-touch starting keeps your RV AC, fridge, and essentials running.
- Extra-Quiet Operation: Soundproofing and enclosed muffler mean quieter days and nights.
- USDA Spark Arrestor Muffler: Safe for national forests and campgrounds—no modifications needed for compliance.
- Built for the Long Haul: Get reliable, long-lasting power—perfect for replacing your well-traveled original Onan.
- Worry-Free Protection: Built-in shutoffs for low oil, overload, and engine issues let you relax wherever you park.
Features to know about
Seamless Replacement or Upgrade for Your RV
If your old generator finally gave out, this Onan QD 12500 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 three 15,000 BTU air conditioners at once, so you can beat the summer heat and stay comfortable wherever you park.
Reliable Power, Every Time
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.
Peace and Quiet, Anywhere
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.
Simple Upkeep for the Real World
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.
Specs:
Dimensions & Weight:
- Overall dimensions: 41-3/8" long x 24-1/2" wide x 27" tall
- Overall weight: 787 lbs
Engine & Performance:
- Design: 4-cycle, liquid-cooled diesel engine
- Cylinders: 3 inline vertical cylinders
- Displacement: 91.44 in³ (1499 cm³)
- Compression ratio: 23:1
- Maximum power at 1800 rpm: 24.8 hp (18.5 kW)
- Cooling: centrifugal blower cooling
- Oil capacity: 5.9 qt (5.6 L)
Electrical & Fuel:
- Watts: 12,500
- Frequency: 60 Hz
- Voltage: 120 V / 240 V
- Amperage: 104 amps / 52 amps
- Circuit breakers: (2) 50-amp breakers
- Maximum operating temperature: 120° F
- Fuel: diesel
Mechanical:
- Electric fuel pump
- Heavy duty air cleaner
- Remote 12V starter
- Automatic timed glow plugs for quick, easy start
Noise:
- Sound level: 70 dBA, meets National Park Service requirements of max 60 dBA @ 50 ft
- Sound dampening housing with enclosed muffler
- Three-point, fully focalized internal mounting system reduces vibration
Safety:
- USDA Forest Service approved spark arrestor muffler
- Instant one-touch stop
- Low oil pressure, over/under speed, and overload protection
- Meets applicable U.S. EPA and California emissions standards
Warranty:
Notes:
- Designed for diesel fuel only. Gasoline and LPG models are available for alternative fuel needs - see CM25ZR, CM54RR, CM62ZR, CM72ZR, CM92ZR, CM22ZR, CM34RR, CM32ZR, CM42ZR, CM82ZR, or CM52ZR.
- For specialized applications required to meet Tier III Evaporative Emissions of the California Air Resources Board. Effective January 1, 2011, gasoline generator sets on trailers, diesel chassis or any other non-motorized mobile apparatus must have an EVAP generator set, approved tank, EVAP canister, hoses and fittings all meeting the CARB Tier 3 and EPA phase 3 standards and specifications. This law applies in all 50 states.
- This product cannot be shipped to or used in California.
A055E844 Cummins Onan RV Generator - QD12500 - Diesel - 12.5HDKCB-11506
WARNING: This product can expose you to chemicals including Carbon black (airborne, unbound particles of respirable size) which is known to the State of California to cause Cancer, and Lead which is known to the State of California to cause Developmental Harm. For more information, go to www.p65warnings.ca.gov.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.