CAT 336 vs. Komatsu PC360LC-11: Large Excavator Comparison for Heavy Civil Work

Somewhere between the 20-ton excavator that handles most utility trenching and a true mining-class machine sits a class of excavator that doesn't get talked about nearly enough: the 36-to-40-ton workhorse. This is the machine that shows up when a job stops being about digging a trench and starts being about moving real dirt — mass excavation for a retention pond, bulk grading ahead of a pad, loading haul trucks on a quarry face, or ripping out a building's foundation on a demolition job. If your crews already run a mid-size excavator in the CAT 320 class and you've started turning down bigger mass-excavation and heavy civil bids because you don't have the iron for it, this is the class you're shopping in next.

Two machines dominate the conversation at this size: the Caterpillar 336, CAT's next-generation 40-ton-class excavator that launched in 2022, and the Komatsu PC360LC-11, the current generation of Komatsu's long-running 350-series excavator. Both are genuinely good machines built by manufacturers that know this weight class well, and both show up constantly in the same bid comparisons among contractors who've outgrown a 320 or PC210. We pulled the real spec sheets, built a side-by-side chart, and dug into what the numbers actually mean once the bucket hits the ground.

Meet the Contenders

The CAT 336 isn't a facelift of the old 336F — it's a genuine next-generation redesign that Caterpillar rolled out in 2022 as part of the same platform update that touched the rest of the large excavator lineup. The jump that matters most to an operator: CAT moved the 336 up to a C9.3B engine rated at 311 net horsepower, added a new cab with more glass and a smoother swing, and made CAT Grade with 2D and 3D grade control a factory-installable option rather than an aftermarket bolt-on. Caterpillar markets the 336 as a 40-ton-class excavator, and at roughly 81,900 lb operating weight, it sits right at the top of what most states let you haul on a standard lowboy without extra permitting headaches.

Komatsu's PC360LC-11 is a quieter kind of update. It replaced the PC360LC-10 without a dramatic redesign, but the improvement Komatsu leaned into hardest was hydraulic efficiency — what they call “Improved Power mode,” which is really about squeezing more digging performance out of the engine without burning more fuel. That matters on a machine that's going to run 2,000-plus hours a year on mass excavation: shaving fuel burn on a big-bore diesel adds up fast across a season. The PC360LC-11 runs Komatsu's HydrauMind load-sensing hydraulic system, the same architecture Komatsu uses across its PC210 and PC220 excavators, tuned for a bigger frame here.

What the Spec Sheet Actually Tells You

On paper the two machines are close, and that's exactly why this comparison matters — the differences are the kind you only notice once you've run both. The CAT 336 comes in heavier at roughly 81,900 lb against the PC360LC-11's 79,146 lb in a comparable configuration. That's not a huge gap, but at this size every few thousand pounds changes how the machine feels on soft or wet ground, and it changes your trucking math if you're moving the excavator between sites regularly. A heavier machine also generally means more stable digging force at full reach, which matters when you're loading haul trucks from a bench and don't want the counterweight lifting on you.

Horsepower is where the 336 pulls ahead more clearly: 311 net horsepower against the PC360LC-11's 257 net horsepower. That's a real gap, not a rounding error, and it shows up in cycle times on hard digging — clay, shot rock, frozen ground in the winter months up north. Komatsu's counter-argument, and it's a fair one, is that HydrauMind's load-sensing pump delivers hydraulic power more precisely to whatever the bucket needs at that instant, so the PC360LC-11 doesn't feel as far behind in the field as the horsepower numbers alone suggest. Contractors who've run both machines back to back generally agree the 336 has more raw muscle for breaking ground, while the PC360LC-11 feels smoother and more fuel-conscious on lighter digging and finish grading passes.

Reach and dig depth land almost identically — both machines dig to right around 26.8–26.9 feet and reach out to roughly 38.5 feet with a standard boom and stick, which tells you both manufacturers are targeting the exact same mass-excavation and pond-digging use case. Where you'll actually feel a difference is bucket capacity: the 336's standard bucket range tops out around 2.97 cubic yards versus the PC360LC-11's 2.56 cubic yards. On a mass-excavation job where you're being paid by the cubic yard moved and the clock is running, that capacity gap turns into real cycles saved over a ten-hour shift.

The Engineering Details That Separate Them

Grade control is where these two philosophies really diverge. CAT Grade with Assist ties directly into the 336's factory hydraulics and lets an operator run 3D grade work with a smoother, more integrated feel than most aftermarket systems — useful if your crews are doing finish grading on retention ponds or building pads as part of the same scope as the mass dig. Komatsu answers with its own Komatsu-branded grade control options and leans on KOMTRAX telematics to give owners uptime and utilization data across a mixed fleet. If you already run other Komatsu iron and use KOMTRAX to manage your fleet, keeping the PC360LC-11 in that same ecosystem has real operational value — one login, one maintenance-alert system, one set of service intervals to track instead of two.

Cab comfort and visibility both improved meaningfully on the 336's redesign — more glass area and a reworked interior that CAT carried over from its smaller Next Generation excavators. Komatsu's cab on the PC360LC-11 is a known quantity: comfortable, well laid out, and largely unchanged in philosophy from prior PC-11 generation machines, which is either a non-issue or a mild disadvantage depending on how much you value the newest ergonomics on a 2,000-hour-a-year machine your operators live in.

Who Actually Runs a Machine This Size

This isn't a machine every general contractor needs, and that's the point of buying at this class instead of renting it three times a year. The buyers who consistently need a 36-to-40-ton excavator on the yard are mass-excavation and site-development contractors clearing and grading multi-acre pads, underground utility contractors installing 24-inch-and-larger trunk sewer or storm lines where the trench itself demands this kind of reach and bucket capacity, heavy civil subcontractors building retention ponds and detention basins, demolition contractors pulling foundations and structural slabs, and aggregate operations that need a excavator this size loading haul trucks off a quarry face. If your backlog includes two or more of those scopes a year, the math for owning starts looking very different than the math for renting.

Rent vs. Own: The Case for Owning at This Size

Renting a 30-to-40-ton excavator isn't like renting a skid steer. Most general rental houses don't stock machines this large — you're calling a specialty heavy-equipment rental yard, and you're often waiting on availability during peak season when every other contractor in the region is bidding the same mass-excavation work you are. When you do get one, you're paying mobilization and float charges to get a machine this size to your site on a lowboy, and you're paying them again to send it back, every single time you rent. Those float costs don't show up on the weekly rate quote, but they show up on your job cost report.

Owning flips that math. A 336 or PC360LC-11 sitting on your yard means it's available the moment a bid turns into a notice to proceed, with no competing against other contractors for the same rental fleet during your region's busy season. It also means the machine is configured exactly how your crews want it — grade control installed, the right bucket already on hand, telematics tied into your own fleet system — instead of whatever the rental house happened to have ready. For a contractor bidding mass excavation, heavy civil sitework, or utility trunk-line work as a recurring part of the business rather than a one-off, financing a machine like this stops being a luxury and starts being the thing that lets you bid the work you're already qualified to do without waiting on someone else's fleet.

The decision isn't just rent-versus-buy in the abstract — it's whether you'd rather structure a lease or loan around your excavator purchase now, or keep handing float charges and availability risk to a rental yard every time a big job lands. If your excavator financing plan is scaled to your actual bid pipeline instead of a single job, ownership usually wins by the second or third rental cycle in a year.

Fuel Burn and Total Operating Cost

Horsepower and bucket capacity get most of the attention in a spec comparison, but on a machine that's going to run 1,800 to 2,400 hours a year, fuel burn quietly becomes one of the biggest line items in your cost-per-yard math. This is exactly where Komatsu's HydrauMind system earns its keep — by matching hydraulic output to what the bucket actually needs moment to moment instead of running the pump at a constant high output, the PC360LC-11 tends to sip fuel more conservatively during lighter digging, travel, and swing phases of the cycle, even though its peak horsepower trails the 336. CAT's C9.3B engine on the 336 is no less efficient for its class, but the extra 54 horsepower on tap means an operator working aggressively in hard material will burn more diesel to get there, even if the extra power shortens the cycle itself.

Neither manufacturer publishes a single fuel-burn number that means much outside a controlled test, so the honest answer is that the real gap shows up in your own fleet fuel logs after a few hundred hours — and it's worth tracking separately from horsepower when you're deciding which machine actually costs less to run across a full season of mass excavation.

Parts, Service, and Dealer Network

A 36-to-40-ton excavator down for a week waiting on a hydraulic pump or a final drive isn't a minor inconvenience — it's a mass-excavation crew standing around, and that cost dwarfs whatever you saved shopping between brands. Caterpillar's dealer network is the largest in North America by a wide margin, which matters most in exactly the scenario you hope never happens: a major component failure mid-project. Komatsu's dealer network is smaller but still well-established in most major construction markets, and KOMTRAX's remote diagnostics often catch a developing problem before it becomes a breakdown, which can offset some of the network-size gap by preventing the failure in the first place rather than reacting faster to one that already happened.

Before you commit to either brand at this size, it's worth calling your closest dealer for both and asking directly about parts availability and average turnaround on the specific components most likely to need attention on a machine running this many hours — hydraulic pumps, final drives, undercarriage. The answer varies enough by region that it can reasonably tip the decision on its own.

The Verdict: Two Good Answers to the Same Question

There isn't a wrong choice between these two machines — that's what makes this such a common bid-room debate. If your work leans toward hard digging, shot rock, or loading haul trucks where raw horsepower and bucket capacity move the needle, the CAT 336's extra muscle and larger standard bucket are worth the premium. If your fleet is already Komatsu, your operators value HydrauMind's smooth, fuel-conscious hydraulics on finish work, or you're watching fuel burn closely across a heavy annual duty cycle, the PC360LC-11 is a genuinely strong, slightly more efficient answer at a lighter operating weight. Either way, you're buying into a proven 36-to-40-ton platform from a manufacturer that isn't going anywhere, backed by a dealer network that can actually get you parts when a hydraulic hose lets go on a Friday afternoon.

If you're weighing this purchase against what a large excavator financed today would mean for the mass-excavation and heavy civil bids you've had to pass on, it's worth running the real numbers instead of guessing. Every large excavator on our lot moves through the same financing desk as our smaller machines — the process doesn't get more complicated just because the equipment got bigger.

Ready to Put One of These to Work?

Renting by the month adds up fast and you never build equity. If you're ready to add a large excavator to your fleet, start your equipment financing application and we'll walk you through structuring the deal around your job pipeline.

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