Kubota's U Series Mini Excavators: A Buyer's Guide to the Full Zero-Tail-Swing Lineup
Walk a Kubota dealer's lot in South Florida or anywhere else in the country and the letter you'll see stamped on more compact excavators than any other is U. The U Series is Kubota's entire zero-tail-swing excavator lineup, and it spans four distinct size classes that cover everything from a backyard gate install to a full utility crew digging a lateral line. Most buyer's guides online cover one model against a competitor's machine. This one lines up the whole Kubota family against itself, so you can figure out which size actually fits your work before you sign a loan application.
Why Zero Tail Swing Matters More Than the Model Number
Every machine in the U Series shares one engineering decision: the rear counterweight never swings past the width of the tracks, even at full rotation. On a wide-open grading job that detail barely matters. On a fenced backyard, a tight utility easement, or a job squeezed between a building and a property line, it's the difference between swinging freely all day and stopping every few minutes to check clearance behind you. That single design choice is why the U Series shows up constantly on landscaping, utility, demolition, and remodeling jobsites where the work happens close to something expensive.
The U17-5: Kubota's Smallest Dig, Updated to Dash 5
The U17-5 is the newest member of the lineup and the first U Series model to move up to Kubota's current Dash 5 update. It's a 1.7-metric-ton machine built for jobs where even a slightly larger excavator won't fit through the gate:
Operating weight: 3,902 lbs
Engine output: 16.1 gross horsepower, Kubota diesel
Max dig depth: 7 ft 6.2 in
Dump height: 8 ft 1.2 in
Bucket breakout force: 3,547 lbs
Auxiliary hydraulic flow: 7.3 gpm
Ground pressure: roughly 4 psi
The Dash 5 update widened the hydraulically retractable track frame to 39.4 inches retracted and 51.2 inches expanded, about 2.4 inches wider than the previous generation, and stretched the rear end by 1.2 inches for a touch more stability under load. At 4 psi of ground pressure, the U17-5 can work on finished lawns, pool decks, and freshly poured patios without leaving the kind of ruts a wheeled skid steer would. Fence installers, pool and patio crews, irrigation contractors, and small utility outfits are the trades that actually buy this size, usually as a second or third machine rather than a company's only excavator.
The U27-4 and U35-4: The Middle of the Lineup
Step up to the U27-4 and you're in genuinely different territory: a machine built to actually dig a trench or a footing all day, not just dress up around one. Current published specs put the U27-4 at:
Operating weight: roughly 5,625 lbs (2,551 kg)
Engine output: 20 horsepower net, 20.8 gross
Max dig depth: approximately 9 ft 4 in
Tail swing radius: 2.6 ft, still zero tail swing
Auxiliary hydraulic flow: 12.7 gpm
The U35-4 sits one step above it, in roughly the 3.5-metric-ton class, built for crews who need more breakout force and a longer reach than the U27-4 offers but still want the tight-access footprint that makes the whole U Series worth buying over a standard excavator. Kubota positions it as the size most general and utility contractors land on once they outgrow a sub-2-ton machine and need something that can keep up with a crew doing water, sewer, or electrical lateral work every day. Dash-4 remains the current generation on both the U27-4 and U35-4 as of this writing, so neither one has gone through the kind of ground-up update the U17-5 just received.
The U48: The Biggest Zero-Tail-Swing Machine in the Family
At the top of the U Series sits the U48, Kubota's largest excavator that still carries a true zero-tail-swing frame. The published figures for this class:
Operating weight: 4,760 kg on canopy, 4,850 kg with an enclosed cab (roughly 10,500-10,700 lbs)
Engine output: 40.2 horsepower net, 41.8 gross, from a Kubota V2607-DI diesel
Max dig depth: 3,380 mm (about 11 ft 1 in); max vertical dig depth 2,670 mm
Bucket breakout force: 3,360 kgf (about 7,400 lbf)
Auxiliary hydraulic flow: AUX1 at 70 l/min (18.5 gpm), AUX2 at 37 l/min (9.8 gpm)
That dual auxiliary circuit is the detail worth noticing. A 70 l/min primary auxiliary line is enough to run a hydraulic hammer, auger, or compaction wheel at full capacity, which puts the U48 in range for demolition subs, utility crews setting posts or breaking out old slabs, and site-development contractors who want one machine that can trench, break concrete, and still thread through a gate that a mid-size excavator never could.
Which Size Actually Fits Your Work
The honest answer depends on what you're digging and what's around the hole, not on horsepower alone:
Fence, irrigation, pool, and small remodel crews: the U17-5 almost always wins on ground pressure and footprint.
General utility, water/sewer lateral, and site-prep crews digging all day: the U27-4 or U35-4 is the realistic workhorse size.
Demolition, hardscape, and heavier utility work needing real attachment power: the U48 carries the hydraulic flow to run hammers and augers without choking.
Transport and Trailering Across the Lineup
The weight jump across the U Series isn't just a spec-sheet number, it changes what you can legally tow and with what. A U17-5 at roughly 3,900 lbs loads onto a standard tandem-axle equipment trailer behind almost any half-ton or three-quarter-ton pickup most contractors already own. Step up to a U35-4 or especially a U48 with a cab, and you're pushing combined trailer-and-machine weight well past what a half-ton truck should be rated to pull, which usually means a heavier tow vehicle, a gooseneck or deckover trailer rated for the load, and in some states a different license class depending on your combined gross weight. That's a real cost that belongs in the financing conversation, not an afterthought discovered after delivery. If your current truck and trailer combo already handles your largest machine, moving up a size class inside the U Series is simpler than it looks. If it doesn't, budget the trailer upgrade into the same loan rather than treating it as a separate problem later.
Service Intervals and What Actually Drives Ownership Cost
Every machine in the U Series runs a Kubota diesel with standard service intervals around 50, 250, and 500 hours for fluid and filter changes, and all four sizes share Kubota's parts and dealer network, which matters more than people expect once a machine is a few years old. The real cost differences between sizes show up in undercarriage wear and attachment pricing, not the base service schedule. A U17-5's rubber tracks and rollers are inexpensive relative to a U48's, but the U48 spreads that heavier undercarriage cost over a machine that can also run a hydraulic hammer or auger at full flow, work the smaller machines can't do at all. When you're comparing a used U27-4 against a used U35-4 at similar hours, track and undercarriage condition is the single most expensive thing to inspect before you buy, because replacing tracks on either size can run into real money fast.
Financing a U Series Machine: Own It or Keep Renting
A U27-4 or U35-4 typically rents for several hundred dollars a day at most equipment rental counters, and that adds up fast once a machine is on a jobsite more than two or three weeks out of every month. We don't publish specific rate quotes here because every deal is different, but the structural comparison is straightforward: a rental has no path to equity no matter how many months you've paid for it, while a term loan or equipment lease builds ownership with every payment and gives you a depreciable asset on your books. For a contractor who already knows this size of machine will be busy most weeks of the year, financing usually wins the math once utilization crosses that threshold. For an outfit that needs a mini excavator three or four times a year for a specific job type, renting still makes sense. The honest test is your own job calendar, not a sales pitch.
The trades that end up owning rather than renting a U Series machine tend to share one trait: the excavator is doing something for them nearly every workday, not just on the days it's the star of the job. A fence contractor who also sets posts for retaining walls, an irrigation installer who's started bidding small drainage jobs, a demolition sub who needs the U48's hydraulic flow for a hammer as often as a bucket, a general contractor running a two- or three-person crew doing driveway culverts and footings between bigger jobs, a property-services company handling both landscape grading and utility repair calls: all of them tend to find that owning the right size outright, financed with manageable monthly payments, beats paying rental rates and rental-yard availability risk every single time they need the machine on short notice.
We've written separately about how Kubota's factory-installed hydraulic quick coupler changes attachment swaps on this same U Series platform, and that's worth a read if you're planning to run more than a bucket on whichever size you choose: Kubota's Hydraulic Quick Coupler vs. John Deere's Mechanical Coupler.
If you're weighing new against a used unit in any of these size classes, our breakdown of what actually holds resale value on a used Kubota excavator covers the hydraulic coupler, dash-generation, and tail-swing factors that move used pricing most.
See the full current Kubota lineup we finance nationwide, including every U Series size class, on our Kubota equipment financing page.
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