CAT 303 CR vs. Bobcat E35 R2-Series: The Honest Comparison in the 3-4 Ton Mini Excavator Class

Sep 25

7 min read

The 3–4 ton mini excavator class is where most residential and light utility contractors actually live — small enough to fit through a backyard gate or a 36-inch access point, big enough to dig a real footing or a utility trench without babying it. CAT and Bobcat both build a machine squarely in this bracket: the CAT 303 CR and the Bobcat E35 R2-Series. They get compared constantly in dealer lots and almost never with real numbers side by side, so here's the honest version — what each machine actually delivers, where they genuinely differ, and who should buy which.

The Real Numbers

The CAT 303 CR runs a CAT engine rated at 23.6 hp (17.6 kW) net power, weighs 7,817 lb operating weight, reaches a maximum dig depth of 116.1 in (2,950 mm) with the long-stick configuration, and produces 6,385 lbf of bucket digging force.

The Bobcat E35 R2-Series runs a Kubota Tier 4 engine — Bobcat offers it in a 25 hp and a 33 hp variant — weighs a comparable 7,659 lb, and produces 7,284 lbf of bucket breakout force, a figure Bobcat holds consistent across every arm configuration it offers. And that's the real story on this machine: it comes standard-arm at 121.2 in of dig depth, long-arm at 133 in, and in an extendable-arm configuration that reaches all the way to 153.2 in — more than three additional feet of dig depth over the CAT 303 CR's long-stick figure, from the same base machine.

Where They Actually Differ

Two real, verifiable differences separate these machines, and neither is marketing spin. First, breakout force: Bobcat's 7,284 lbf beats CAT's 6,385 lbf by roughly 14% despite the two machines weighing within 160 lb of each other — a genuine edge for the E35 in raw digging force per pound of machine, which matters directly on hardpan or compacted fill where breakout force, not bucket size, decides your cycle time. Second, reach: the E35's extendable-arm option gives you a materially deeper and longer-reaching machine without stepping up a full weight class, which is real versatility for a contractor who occasionally needs to dig deeper than a typical residential footing or trench — a deep utility tie-in, a pool excavation, a basement egress — without owning a second, bigger machine just for those jobs.

The engine sourcing is worth calling out too, because it's a real operational trade-off, not just a spec-sheet footnote. CAT builds and services its own engine for the 303 CR, which keeps parts and diagnostics inside CAT's own dealer network end to end. Bobcat runs a Kubota engine in the E35, which means engine-specific parts and service route through Kubota's network alongside Bobcat's own — not necessarily a downside given how deep Kubota's diesel parts network runs in North America, but it's a different support model than an all-CAT machine, and it's worth asking your dealer directly how that plays out for warranty and routine service in your specific area.

The Predecessor Comparison

Bobcat's R2-Series update to the E35 is well documented: it replaced the prior R-Series E35 with new low-effort joysticks paired with a redesigned hydraulic control valve for meaningfully better metering and controllability, a roomier and more comfortable cab, and — on the 33 hp variant specifically — a newly redesigned Bobcat engine built for better efficiency and simpler routine maintenance, including improved cold-weather starting. That's a real, substantive update, not a badge change, and it's the same pattern we found when we covered Bobcat's related E32 R2-Series update — Bobcat is working through its small excavator lineup class by class, and the hydraulic and control improvements are consistent across both machines.

The CAT 303 CR's own generational history is less cleanly documented in CAT's current published materials — we're not going to invent a specific predecessor comparison we can't verify, and neither should any dealer trying to sell you one. What's clear is that the 303 CR sits in CAT's current small mini-excavator generation alongside the 303.5 CR and 304, all matched to the same 3–4 ton attachment ecosystem, including the single-shank ripper we covered separately. If a predecessor comparison matters to your buying decision, ask your CAT dealer directly for the specific generational changeover on this model — it's a fair question and one they should be able to answer with real data.

Attachment Ecosystem and Hydraulic Compatibility

Both machines are built to run the same broad category of 3–4 ton attachments — hydraulic thumbs, augers, compaction plates, and rippers — through a standard quick-coupler or pin-on mount, so neither brand locks you out of the aftermarket attachment world. Where it actually matters is auxiliary hydraulic flow and pressure for anything beyond a bucket and thumb: a hydraulic breaker, a compaction wheel, or a mulching head draws on the machine's auxiliary circuit, and Bobcat's new low-effort joystick and redesigned hydraulic control valve on the R2-Series E35 are specifically built to improve metering — how precisely you can modulate flow to an attachment — rather than just raw pump output. That's a real, felt difference running anything that needs fine hydraulic control, like a compaction wheel backfilling a utility trench in tight lifts. CAT's advantage runs the other direction: because the 303 CR shares its attachment coupler system with the rest of CAT's 3–4 ton mini excavator family, including the single-shank ripper line we've covered separately, a contractor standardizing on CAT across multiple machines gets attachment interchangeability across the whole small-excavator fleet, not just one unit.

Operator Comfort, Control Layout, and Stability

Neither manufacturer publishes a meaningfully different cab footprint in this class — both are genuinely tight one-person cabs built for all-day comfort rather than cross-body movement — but the control feel differs in ways an operator notices in the first hour, not the spec sheet. Bobcat's redesigned R2-Series joystick and valve combination specifically targets lower operator effort and smoother multi-function control, which matters most on repetitive digging cycles where hand fatigue over an 8-to-10-hour day is a real productivity factor, not just a comfort one. CAT's control layout keeps continuity with the rest of its mini excavator lineup, which is the bigger win for a crew rotating operators across multiple CAT machines — muscle memory carries over from a 303.5 CR or a 304 without retraining. Stability-wise, the two machines' operating weights are close enough (7,817 lb versus 7,659 lb) that neither has a decisive edge digging at full reach; the real stability variable in this class is almost always the ground you're working on and whether you've got the counterweight and undercarriage width dialed in for the slope, not a 158-lb difference between two competitors.

Who Should Actually Buy Which Machine

If your work is straightforward footing, trenching, and grading in tight residential or light commercial access — the bread-and-butter jobs for a general contractor, a landscape contractor, or a small excavation sub — both machines do the job well, and the decision often comes down to your existing dealer relationship and brand of loader or skid steer already in the fleet, since shared parts and service relationships save real money over time. If your work regularly needs extra reach or depth — pool installers, septic and utility contractors doing deeper tie-ins, anyone who's occasionally had to call in a bigger machine just because a 3-ton couldn't reach far enough — the Bobcat E35's extendable-arm option is a genuine differentiator worth paying attention to. And if you're running CAT equipment elsewhere in your fleet already, or your ground regularly includes caliche or compacted fill where CAT's own attachment ecosystem — including the single-shank rippers built specifically for this weight class — is already dialed in, the 303 CR keeps everything under one service relationship.

For contractors comparing this class against the next size up, we ran the same honest-numbers treatment on the 7–9 ton bracket in CAT 308 CR vs. Kubota KX080-5 vs. Bobcat E88 — useful if you're not sure whether a 3–4 ton machine is actually big enough for your typical job, or if you're sizing a second, larger excavator to complement one of these.

The Rent-vs-Own Case in This Class

A 3–4 ton mini excavator is one of the most frequently rented pieces of equipment in construction precisely because it's useful on almost every job — which is exactly why owning one pays off fastest. Daily rental on this class typically runs $250–$350 depending on region and attachment package; run that even two days a week across a working season and you're well past a monthly lease or loan payment on either the 303 CR or the E35, with nothing to show for it afterward and no guarantee the specific configuration you need — extendable arm, ripper-ready, whatever your job calls for — is sitting on the rental lot when you need it. Undercarriage wear is also a real factor in that math: a rental unit's track and undercarriage condition is entirely out of your control, while undercarriage economics on a machine you own and maintain yourself are something you can actually manage.

Whichever machine fits your work, financing a 3–4 ton excavator is straightforward at this price point, and used units in this class hold value well enough that how hours and model year shape financing terms is worth reading before you buy used instead of new — the math on a lightly used 303 CR or E35 can work strongly in your favor if you know what to look for.

One last practical note: whichever machine you land on, don't buy on horsepower alone in this class. A 1-2 hp gap between competing 3–4 ton machines almost never decides a real jobsite outcome — breakout force, arm reach, hydraulic metering, and your existing parts and service relationships do. Get a real demo on your actual ground before you sign, ideally digging the specific soil conditions — caliche, wet clay, compacted fill — you'll be running the machine in most, and treat the spec sheet as the starting point for that conversation, not the end of it.

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