When it comes to serious onsite power, few names carry more weight than Caterpillar—and few models have the kind of reputation that the CAT 3512 generator has earned over the years.
If you’ve worked in the oilfield, on a mine site, or in any remote industrial setting, chances are you’ve either operated or relied on one. These engines are still running strong across the globe, and for good reason. They’re not trendy. They’re not “latest-gen.” They just work—day after day, in conditions that would leave lesser units begging for mercy.
We’ve clocked countless hours around CAT 3512s, so we can spot a keeper the minute the panel lights up. Crews keep chasing these engines for one simple reason—they work. If you’re stuck choosing between a shiny new unit and a seasoned 3512 that’s already proved itself, stick with us. We’ll help you decide whether this workhorse belongs on your site.
So what keeps the 3512 showing up on the toughest jobs?
1. Serious Output
Dial it in, and a 3512 puts out a reliable one to two megawatts of power—more than enough to keep a rig turning, feed an entire frac spread, drive a compressor station, or stand guard as the emergency backup when the grid drops.
2. Low-RPM Efficiency
It’s built to run at 1,200 or 1,800 RPM depending on spec. Lower RPM means less wear, smoother operation, and extended lifespan when properly maintained.
3. Simple to Maintain
This isn’t some overly computerized power plant that needs a laptop just to change a sensor. The CAT 3512 is mechanical where it counts, rugged where it matters, and has a global network of parts and support if needed.
Why Buy Used? Simple: ROI and Reliability
A brand-new CAT 3512 with factory spec, Tier 4 Final compliance, and custom housing can run you well into the six figures. For many operations, that’s a steep price tag—especially when solid, field-tested units are available for a fraction of that cost.
Here’s why a used unit might be your smartest move:
- Upfront savings of 40–60%
- Proven reliability—these engines are built to last well beyond 40,000 hours with proper care
- Available now—no waiting on production, lead times, or overseas shipping
- Drop-in readiness—many of our units are already skid-mounted and load-tested
Used doesn’t mean abused. Not when you source it from a team that knows the difference.
What to Look for When Buying a Used CAT 3512
At Power Drive Supply, we don’t just flip equipment—we inspect, verify, and make sure every generator on our lot is ready to work. But whether you’re shopping with us or somewhere else, here’s what to keep an eye on:
✔️ Engine Hours and Load Profile
Ask how the generator was used. Was it load-balanced? Constant-start/stop? Standby? These clues help determine wear.
✔️ Oil Sampling and Maintenance Records
If the previous owner took care of it, they’ll have records. If you’re buying from us, we’ll show you full maintenance history, load bank tests, and fluid samples.
✔️ Cooling System Condition
The radiator, water pump, and hoses should all be clean and pressure-tested. Overheating is the death of any diesel engine.
✔️ Control Panel Functionality
We test all controls on-site—ensuring the governor, shutdown systems, alarms, and monitoring readouts are functional and accurate.
✔️ Skid and Enclosure Integrity
If the unit’s been stored outdoors, rust and weather damage are real risks. Our units are cleaned, repainted where needed, and stored properly.
Use Cases: Where the CAT 3512 Shines
The 3512 isn’t for small jobs. It’s a heavy-duty unit meant for operators who need sustained, high-output performance in demanding environments. Some examples of where our clients are using them:
- Oilfield drilling sites – powering drawworks, mud pumps, and lighting
- Compressor stations – supporting 24/7 natural gas operations
- Fracturing operations – handling massive electrical loads for multiple pumps
- Mining camps – off-grid power for crushers, conveyors, and worker camps
- Municipal backup power – reliable energy for hospitals, data centers, and water treatment plants
It’s the definition of overbuilt—and that’s exactly what makes it reliable.
Why Buy From Power Drive Supply?
We don’t list generators unless we’ve put eyes (and often hands) on them ourselves. Our process includes:
- Comprehensive inspections before a unit is listed
- Load testing to confirm operational power output
- Maintenance verification with records or logs
- Photos, videos, and walk-throughs available upon request
- Shipping and logistics handled—we’ll get it to your yard, anywhere in the U.S.
And if you need more than one? We often carry matched sets, pre-configured for synchronized operation, saving you time and setup costs.
Don’t Overpay for Power
A new generator might come with a shiny label, but when it’s time to turn key and push load, what matters is performance. The CAT 3512 diesel generator has earned its reputation by doing exactly that—time and time again, in the toughest environments.
We’ve got units in stock, ready to ship, priced to move. No games, no mystery, just real iron that works.
Ready to get specs, pricing, or see what’s on the lot?
Call us or reach out through our contact form. We’ll show you exactly what’s available, answer every question straight, and help you get power where you need it—fast.