Kubota builds some of the most popular mini excavators on the market, and for good reason, they’re compact, fuel-efficient, and built to last well beyond their first owner. But choosing the right model means getting into the numbers. Digging depth, operating weight, horsepower, and bucket capacity all vary significantly across the lineup, and those differences determine whether a machine fits your job or holds it back. That’s exactly why understanding Kubota mini excavator specs matters before you commit to a purchase.

At Japan Machinery Trader, we source used Kubota mini excavators directly from Japanese rental fleets and auction channels, machines that typically come with lower hours and well-documented maintenance histories. We inspect every unit and handle export logistics worldwide, so buyers in Africa, the Middle East, Southeast Asia, and beyond can access reliable equipment at competitive prices.

Below, we break down the specs for 6 Kubota mini excavator models, from the sub-1-ton U-10-5 up to the mid-size U-55-5. Each section covers the key numbers, weight, horsepower, dig depth, and more, so you can compare models side by side and find the right fit for your operation.

1. Japan Machinery Trader Kubota mini excavators

Japan Machinery Trader sources used Kubota mini excavators directly from Japanese rental companies and auction channels. These machines arrive with lower operating hours than comparable used equipment from other markets, because Japanese rental fleets follow strict maintenance schedules and rarely push machines past safe limits.

How to compare specs across multiple Kubota models fast

When you’re reviewing Kubota mini excavator specs across several models, line up the core numbers side by side: operating weight, engine horsepower, and maximum dig depth. Those three figures eliminate most mismatches immediately, whether your constraint is transport weight limits, site access width, or trench depth requirements.

Narrowing by weight class first cuts your shortlist down faster than any other filter.

Start there, then work down to secondary specs once you’ve ruled out machines that clearly don’t fit your jobsite conditions or haul capacity.

What to confirm beyond weight, HP, and dig depth

Once you have a shortlist, check bucket heaped capacity and hydraulic flow rate, which together determine how productive a machine is per cycle. You should also verify tail swing radius, especially when working in confined sites where a standard-swing machine creates safety risks near walls or structures.

Auxiliary hydraulic flow is worth confirming if you plan to run attachments like hydraulic breakers or augers, since not all models in this lineup deliver the same output at the auxiliary circuit.

What inspection details matter on used Japanese machines

Ask for the full inspection report and confirm it covers the undercarriage wear, hydraulic hose condition, and swing bearing play. On used Japanese machines, rubber track condition and boom pivot pin wear are reliable indicators of how hard a machine was actually used, regardless of what the hour meter shows.

What to plan for shipping size, paperwork, and delivery

Japan Machinery Trader manages export documentation, freight booking, and customs paperwork for buyers worldwide. Before finalizing any order, confirm the transport dimensions of your chosen model against available container sizes, since compact units like the K008-5 often fit a 20-foot container, while heavier models typically require a 40-foot.

2. Kubota K008-5

The K008-5 is Kubota’s smallest option in the mini excavator lineup. Its sub-1-ton operating weight and narrow transport width make it a practical choice for indoor demolition, landscaping, and access-restricted sites where larger machines simply cannot operate.

Weight, engine power, and max dig depth

The K008-5 weighs 920 kg (2,028 lbs) and runs on a Kubota D722 engine producing 10.1 hp (7.5 kW). Maximum dig depth reaches 1,680 mm (66.1 inches), which handles most light trenching and landscaping work without issue. These Kubota mini excavator specs place it firmly in the micro-excavator category.

Key dimensions that decide access and transport

This machine measures 980 mm (38.6 inches) in transport width, meaning it fits through standard doorways and narrow garden gates. Overall transport length is 2,720 mm, so you can load it onto a small trailer without specialized equipment.

If your site has strict access constraints, the K008-5’s transport width is often the deciding factor over dig depth or engine output.

Where the K008-5 fits best on real jobsites

Your best use cases for the K008-5 include indoor demolition, residential landscaping, and confined utility trenching. Its light footprint also reduces surface damage on finished ground, which matters on renovation and hardscaping projects.

Used-buy checklist for compact machines

When reviewing used K008-5 units, confirm rubber track thickness and check the boom cylinder seals for leaks. Verify the hour meter reading against visible wear on the blade edge and bucket pins.

3. Kubota U17

The U17 sits in the 1.7-ton class and brings meaningful capability upgrades over the K008-5 while staying compact enough for restricted-access sites. Its zero tail swing design is the standout feature, letting you work safely close to walls, fences, and structures without the rear of the machine swinging into obstacles.

Weight, engine power, and max dig depth

The U17 carries an operating weight of 1,650 kg (3,638 lbs) and runs a Kubota D902 engine producing 13.5 hp (10.1 kW). Maximum dig depth reaches 2,470 mm (97.2 inches), which is a solid step up from the micro-excavator class and handles most utility trenching and light foundation work without strain.

Tail swing and width options for tight spaces

Kubota offers the U17 in two track width configurations: a 990 mm narrow width and a 1,240 mm standard width. The zero tail swing radius keeps the counterweight within the machine’s track footprint during rotation, removing a genuine safety risk on confined urban sites.

The zero tail swing feature is often the deciding factor for contractors working close to structures or in city-center environments.

Where the U17 fits best on real jobsites

The U17 performs best on urban utility work, residential foundation trenching, and indoor demolition where both access width and swing clearance matter. Its dig depth also makes it practical for drainage and pipeline runs that exceed the reach of true micro-excavators.

Used-buy checklist for compact machines

When reviewing a used U17, inspect the swing bearing and boom pivot pins for play. Check the hydraulic hose routing around the zero-tail-swing area, since hoses in that zone wear faster on machines that regularly worked tight sites.

4. Kubota KX033-4

The KX033-4 moves into the 3-ton class, bringing a meaningful jump in digging power and working reach over the U17. This model suits contractors who need a machine capable of deeper excavation and heavier material handling without stepping up to a full-size unit.

Weight, engine power, and max dig depth

The KX033-4 carries an operating weight of 3,195 kg (7,044 lbs) and runs a Kubota D1703 engine producing 24.8 hp (18.5 kW). Maximum dig depth reaches 3,264 mm (128.5 inches), which opens up foundation work, sewer line installation, and deeper utility trenching that the lighter models cannot reach.

Reach, dump height, and working envelope basics

Reviewing Kubota mini excavator specs for this model, you get a max reach at ground level of 4,665 mm (183.7 inches) and a dump height of 3,170 mm (124.8 inches). That working envelope lets you load trucks directly without constantly repositioning on confined sites.

Dump height is easy to overlook, but it directly affects cycle time when you’re loading onto trucks parked at grade.

Where the KX033-4 fits best on real jobsites

The KX033-4 works well on sewer and drainage installations, residential foundation excavation, and road utility trenching. Its weight class also handles harder ground conditions more effectively than sub-2-ton machines.

Used-buy checklist for compact machines

When reviewing a used KX033-4, inspect the boom and arm cylinder seals for any leakage. Also check track frame welds for cracking, which appears on machines that worked consistently in rocky or abrasive ground.

5. Kubota KX040-4

The KX040-4 steps up into the 4-ton class and delivers a noticeable increase in digging force, lifting capacity, and hydraulic power over the KX033-4. If your work involves tougher ground conditions or larger material volumes, this model handles those demands without requiring a full-size machine on site.

Weight, engine power, and max dig depth

Kubota’s KX040-4 carries an operating weight of 3,895 kg (8,587 lbs) and runs a V2203 engine producing 36.7 hp (27.4 kW). Maximum dig depth reaches 3,665 mm (144.3 inches), giving you the reach needed for deeper foundation work, pond excavation, and utility trenching that exceeds what the KX033-4 can manage. These Kubota mini excavator specs confirm its position in the capable mid-range class.

Stability and lift considerations in the 4-ton class

Added weight in this class directly improves stability during lifting and side-reach work, reducing tipping risk when you’re loading trucks from awkward angles. Bucket breakout force also increases significantly over lighter models, translating to faster cycle times in compacted or clay-heavy soil.

If your sites regularly involve heavy lifts or dense material, the KX040-4’s stability advantage over 3-ton machines becomes a practical daily benefit.

Where the KX040-4 fits best on real jobsites

This model performs best on foundation excavation, pond construction, and road maintenance projects where both dig depth and material volume push beyond what lighter machines handle. Its dimensions still allow transport on a standard flatbed trailer.

Used-buy checklist for compact machines

When reviewing a used KX040-4, inspect boom and arm cylinder seals carefully for leakage and check bucket pin and bushing wear, which reveals how hard the machine worked in dense or rocky ground conditions.

6. Kubota KX057-5

The KX057-5 is Kubota’s largest mini excavator in this lineup and delivers the most digging power, hydraulic output, and working reach of the six models covered here. If your projects regularly involve heavy ground conditions, larger trench volumes, or demanding attachment use, this machine is the right choice.

Weight, engine power, and max dig depth

The KX057-5 carries an operating weight of 5,490 kg (12,104 lbs) and runs a V3307 engine producing 47.6 hp (35.5 kW). Maximum dig depth reaches 3,810 mm (150 inches), handling deep foundation work, large drainage projects, and heavy excavation that exceeds the KX040-4’s reach. These Kubota mini excavator specs place it firmly at the top of the compact class.

Hydraulic flow and attachment readiness

The KX057-5 delivers high auxiliary hydraulic flow, making it well-suited for running demanding attachments like hydraulic breakers, augers, and compactors at full operating pressure. Confirm the auxiliary circuit flow rating against your attachment’s requirements before purchasing, since mismatches reduce both attachment performance and overall machine longevity.

If you run attachments regularly, the KX057-5’s hydraulic output gives you capacity that the lighter models in this lineup simply cannot match.

Where the KX057-5 fits best on real jobsites

This model handles deep foundation excavation, large drainage and sewer installations, and heavy demolition support where consistent power and reach matter throughout the workday. Its size still allows transport on a standard low-loader trailer without special permits in most markets.

Used-buy checklist for compact machines

When reviewing a used KX057-5, inspect the boom cylinder seals and hydraulic return filters for contamination or leakage. Also check undercarriage wear components, including track links, rollers, and idlers, which show significant wear on machines that worked long hours on abrasive terrain.

Quick recap

These six models cover a wide range of Kubota mini excavator specs, from the 920 kg K008-5 designed for access-restricted sites to the 5,490 kg KX057-5 built for demanding ground conditions and heavy attachment use. Each machine fills a specific role, and matching the right model to your jobsite requirements comes down to operating weight, dig depth, and hydraulic capacity working together, not any single number in isolation.

When you’re ready to move from specs to purchase, sourcing from Japanese rental fleets gives you an advantage that other used equipment markets rarely match: lower hours, documented maintenance, and professional inspection reports you can verify before committing.

Browse current stock and get direct pricing by visiting Japan Machinery Trader’s used Kubota mini excavators. The team handles export logistics, customs documentation, and freight coordination for buyers worldwide, so you can focus on picking the right machine rather than managing the shipping process.