Used Cummins Diesel Generators for Sale
Your Trusted Partner for Reliable Pre-Owned Cummins Power
Experience Unmatched Power & Proven Reliability with Used Cummins Diesel Generators
When your operations demand unwavering power, efficiency, and durability, a Cummins diesel generator stands as a global leader. At Generator Source, we specialize in providing meticulously inspected and tested used Cummins diesel generators, offering the same legendary performance at a fraction of the cost of new. Our extensive inventory covers a broad range from 20kW to 4000kW, ensuring you find the ideal power solution for any application, from critical standby power to continuous prime power.
Choosing a used Cummins generator from Generator Source means investing in a powerhouse known for its robust engineering, fuel efficiency, and worldwide serviceability. Each unit undergoes our rigorous 31-point inspection process to guarantee peak performance and reliability, ready to integrate seamlessly into your system.
Why Choose a Used Cummins Diesel Generator from Generator Source?
Cummins Reliability
Cummins generators are engineered for demanding conditions, featuring heavy-duty components and advanced control systems that ensure consistent power delivery and extended operational life.
Immediate Availability
Bypass lengthy manufacturing lead times. Our used Cummins generators are ready for immediate deployment, allowing for rapid integration into your facility or project.
Cost Savings
Acquire premium Cummins power generation equipment at a substantially lower investment compared to purchasing new, freeing up capital for other operational needs.
Proven Performance
Many of our used Cummins units have a documented history of reliable operation, particularly low-hour standby units that have primarily served as backup power. All backed by our 31-Point Inspection process.
Popular Used Cummins Diesel Generator Models & Series
Our inventory frequently features a wide array of Cummins models and series, renowned for their specific strengths and applications. Some of the highly sought-after Cummins diesel generator series you might find include:
Cummins Onan Series
Often found in smaller to medium kW ranges, known for reliable standby and prime power solutions for commercial and light industrial use.
Cummins QSK Series
High-horsepower engines delivering robust power for large-scale industrial, data center, and critical facility applications. (e.g., QSK60, QSK50).
Cummins QST Series
Designed for heavy-duty applications, offering excellent power density and reliability for mining, oil & gas, and large commercial operations (e.g., QST30).
Cummins QSB/QSL Series
Versatile and efficient engines used in a wide range of generators from commercial to industrial, offering a balance of power and efficiency.
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Popular Cummins Generators
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Our 31-Point Inspection
Quality Assurance
Built on Integrity, Committed to Excellence
Standard Tests
- Grease Gen Bearing
- Tighten Hose Clamps
- Check Oil & Condition
- Check Coolant (Full & Protected for Temp)
- Turn Engine for 2 Full Rounds
- Remove Remote Wires
- Tighten All Term Screws
- Check Air Filter
- Check Barrel Leads (Insul. Tightness)
- Voltage Check
- Check Fan Belts
- Missing Belts
- Check Block Heater
- Remote Start Connection (Locate, Test & Tag)
- Fuel Pumped Out of Tank
- Battery Voltage (12 or 24 Volt)
- Cold Water Leaks
- Check Fuel Rack
- Check Battery Cables
- Check Battery Charger
Load Bank Tests
- Check Temperature with Heat Gun
- Coolant Leaks
- Oil Leaks
- Full Rating Tests
- Gauge Compliance Tests
- Gauge Adjustment Tests
- Accurate Temperature Gauge Test
- Engine Alternator Test
- Pre-Alarm Verification
- Shut Down Verification
- Auto Start Test & Tag Verifications
What to Consider When Selecting Your Used Cummins Generator
Power Requirements
Accurately calculate your total power needs, factoring in starting loads (e.g., motor-starting surge). Our experts can assist with proper generator sizing.
Application
Determine if you need backup power, continuous power, or supplementary power during high demand.
Fuel Type & Capacity
While this page focuses on diesel, consider fuel tank size and replenishment logistics for extended operation.
Hour of Operation
Lower hours often indicate less wear, but well-maintained high-hour units can still offer excellent value.
Physical Condition & Enclosure
Assess the generator’s physical state, and decide if an open, enclosed (sound-attenuated), or trailer-mounted unit best suits your environment.
Voltage & Phase
Match the generator’s output voltage and phase configuration to your facility’s electrical requirements.
Maintenance & Service History
Request available records to understand past servicing and potential future needs.
Budget
Balance your power needs with your financial allocation for the generator itself, as well as installation and ongoing maintenance.
What is the typical lifespan of a used Cummins diesel generator?
With proper maintenance, Cummins diesel generators are built to last for thousands of hours. Many used units, especially those that served as standby power, have significant operational life remaining. Our detailed inspection helps assess the remaining life.
Do used Cummins generators come with a warranty?
While used generators typically do not carry a new manufacturer’s warranty, Generator Source offers various warranty options or guarantees on select units. Please inquire about specific warranty coverage for the generator you are interested in.
Can Generator Source assist with installation and ongoing maintenance for a used Cummins generator?
Yes, Generator Source offers installation services and can connect you with our expert service team for ongoing maintenance, parts, and technical support. We have service locations in Austin, TX; Brighton, CO; Jacksonville, FL; and Pensacola, FL.
How do I know the condition of a used Cummins generator?
Every used Cummins generator from Generator Source undergoes a comprehensive 31-point inspection, including load bank testing. We provide detailed reports, photos, and often videos to give you full transparency on the unit’s condition and performance.
Are replacement parts readily available for older Cummins generator models?
Yes, one of the significant advantages of Cummins is their extensive global parts and service network. Parts for most Cummins engine and generator models are widely available, ensuring long-term support for your investment.
Need help finding a generator?
Not sure where to start with your power system? Our team is here to help. Generator projects involve many factors – from sizing and site preparation to compliance – so it’s wise to consult with our experts (and your electrical engineers) early in the process. We can assist in selecting the optimal unit or paralleling setup and ensure all technical requirements are met before purchase and installation.