When it comes to tackling heavy-duty urban construction jobs, Kubota’s compact excavators have earned a stellar reputation worldwide. Among the most popular models in the used market are the Kubota KX163 and the Kubota U55. Both are high-performing, Japanese-engineered machines in the 5.5–6.8 ton class, but they serve fundamentally different operational philosophies. The KX Series prioritizes raw power and stability, while the U Series is engineered for maximum agility in confined spaces.
This expert comparison breaks down the used Kubota KX163 and used Kubota U55 across critical metrics—design philosophy, specifications, digging performance, urban job suitability, and total cost of ownership—to help you determine which used excavator delivers superior value for your heavy-duty urban projects in 2026.
1. Design Philosophy: Power vs. Precision
The fundamental difference between the two series is clearly articulated by industry experts: “Where the U Series prioritizes agility in tight spaces, the Kubota K/KX Series prioritizes raw power and stability”.
Kubota KX163: The Power and Stability Machine
The used Kubota KX163 is a 5.6–6.8 ton compact excavator (depending on configuration) designed for versatility and high performance in demanding environments. It belongs to Kubota’s KX Series, which focuses on delivering robust digging force and exceptional lifting capacity. The KX163’s longer track length and wider stance provide superior stability during heavy digging and lifting operations, making it ideal for projects where the machine remains in one position for extended periods.
A key advantage of the KX163 is its ability to handle heavier lifting tasks. The machine boasts a front lifting capacity of 1,145 kg (2,524 lbs) , a critical metric for jobs requiring pipe handling, concrete block placement, or heavy material loading. The KX163 also features a zero-tail-swing design with only 65mm of tail overhang beyond the track width, allowing it to work efficiently in moderately confined spaces. Combined with its offset boom capability, the KX163 can dig directly against walls without frequent machine repositioning.
Kubota U55: The Ultra-Agility Specialist
The used Kubota U55 (including variants U55-4 and U55-5) is a 5.5–5.8 ton compact excavator with a true zero-tail-swing design. Its counterweight stays entirely within the track width during rotation, allowing 360-degree operation without collision risk—even in extremely narrow spaces like city alleys, basements, and indoor demolition sites.
The U Series is specifically “engineered for one primary purpose: to work perfectly in confined areas,” and is described as “a necessity” when your job site is measured in inches, not acres. The U55-5, Kubota’s tight tail swing compact excavator, is designed specifically for confined-space operations where conventional machines create collision risks or require constant repositioning.
2. Technical Specifications: Head-to-Head Comparison
Data compiled from Kubota official specifications and dealer listings
3. Heavy-Duty Urban Job Performance: Which Excavator Excels?
Digging Force and Excavation Power
Both machines offer nearly identical bucket breakout force—approximately 40 kN (8,990–9,000 lbf)—meaning their digging power in soil, clay, and light rock is comparable. However, the used Kubota KX163 pulls ahead in applications requiring sustained heavy digging. Its longer track length (2,500 mm vs. ~2,200–2,800 mm) and wider track gauge (1,560 mm) provide a more stable platform that translates to better digging efficiency and less machine rocking during aggressive excavating.
For rock excavation or demolition debris handling, the KX163’s greater mass and superior lift capacity give it a noticeable edge.
Lifting and Hoisting Capacity
For heavy-duty urban jobs requiring significant lifting—such as placing concrete pipes, steel beams, or pre-cast elements—the KX163 dominates. Its 1,145 kg front lifting capacity is a standout feature. While U55 lifting specifications vary by configuration, the KX163’s longer wheelbase (1,990 mm) and wider track gauge provide superior stability during hoisting operations, allowing operators to handle heavier loads safely and efficiently.
Maneuverability in Confined Spaces
In ultra-tight urban environments, the U55 holds the advantage. With true zero-tail-swing—its counterweight never extends beyond track width—the U55 can rotate fully without contacting adjacent walls or obstacles, making it ideal for basement excavation, work inside existing structures, and narrow city alley projects where every inch matters.
The KX163, while featuring zero-tail-swing with 65mm overhang, requires slightly more clearance for full rotation. However, for most urban construction sites—where 65mm rarely creates obstruction—this difference is negligible. For work requiring maximum swing clearance, choose the U55; for all other applications, the KX163’s additional power and lifting capacity provide greater value.
4. Key Technologies and Operator Comfort
KX163 Advanced Features
The used Kubota KX163 incorporates a digital LCD monitoring system with advanced signal collection, processing, and distribution capabilities. The system displays real-time operational data—including hour meter, fuel level, water temperature, and engine RPM—and stores up to 90 days of work history. It also includes maintenance reminder functionality and instant fault alerts.
The KX163 is equipped with a three-pump load-sensing hydraulic system with two variable pumps and two gear pumps, providing exceptional responsiveness and fuel efficiency.
U55 Technologies
The U55 features Kubota’s reliable direct-injection diesel engine technology with excellent fuel efficiency and low emissions compliance (Tier 4 Final standards for newer models). The cab is described as having a wide doorway and plenty of operator space, designed for operator comfort during long shifts.
5. Price Analysis: Used Market in 2026
Based on current market data, here are typical price ranges for these models:
| Model | Condition / Hours | Price Range (USD) | Typical Source |
|---|---|---|---|
| KX163 (Used, Good) | 1,000–4,000 hours | $25,000–$35,000 | Dealer / Export yard |
| KX163 (Used, Higher hours) | 4,000–8,000 hours | $15,000–$25,000 | Auction / Private sale |
| U55 (Used, Good) | 1,500–3,000 hours | $18,000–$28,000 | Dealer / Export yard |
| U55 (Used, Higher hours) | 3,000–6,000 hours | $12,000–$18,000 | Auction / Private sale |
A 2020 U55-4 with 2,000 hours was recently listed for approximately $12,800 USD. A 2019 U55 with 1,800 hours was available for approximately $13,000 USD. A 2020 KX163 with 6.8-ton configuration and 2,561 hours was listed in the higher end of the range. The KX Series generally commands higher prices, with the KX Series ranging from $25,000 to $60,000 in the used market, reflecting its premium positioning in terms of power and lifting capacity.
6. Which Machine Should You Choose?
Choose the Used Kubota KX163 If:
- Heavy lifting (pipes, pre-cast concrete, steel beams) is part of your daily operations
- Maximum digging force and stability on uneven terrain are priorities
- Your typical job site has moderate space constraints (standard urban lots, construction zones)
- Longer reach for trenching or slope work is frequently required (KX163 offers 6,140 mm reach)
- You prefer maximum value for money—slightly higher initial cost justified by superior capability
Choose the Used Kubota U55 If:
- Extreme space constraints define your work—building basements, indoor demolition, city alleys
- Zero tail swing within track width is non-negotiable for avoiding wall or obstacle contact
- You prioritize maximum maneuverability over raw lifting power
- Budget is a primary concern—U55 typically offers a $5,000–$10,000 lower entry price
7. Competitor Context: How Do They Compare to Alternatives?
When evaluating used excavators in this class, the Kubota offerings face competition from several established brands:
| Brand/Model | Strengths | Considerations |
|---|---|---|
| Kubota KX163 | Superior lifting capacity; stable platform; proven reliability | Higher purchase price |
| Kubota U55 | Exceptional urban maneuverability; true zero-tail-swing | Lower lifting capacity |
| Takeuchi TB216 | Hydraulically adjustable track width | Smaller weight class (1.9 tons) |
| Hitachi ZX55 | Reliable performance; good parts availability | Lower breakout force than Kubota |
For contractors needing a balance of power and agility, the KX163 remains the strongest performer. For those whose primary constraint is confined workspace, the U55 is unmatched.
Conclusion: Know Your Job Site to Make the Right Choice
The battle between the used Kubota KX163 and used Kubota U55 comes down to one question: What does your job site demand?
If your heavy-duty urban work involves significant lifting, requires maximum digging force on variable terrain, and allows for moderate swing clearance, the used Kubota KX163 is your clear winner. Its superior lifting capacity (1,145 kg), longer reach (6,140 mm), and stable undercarriage make it the more powerful and versatile machine for most urban construction projects.
If your job site is measured in inches—basements, city alleys, indoor demolition—and avoiding wall contact is critical, the used Kubota U55 with its true zero-tail-swing is the specialized tool you need. Its ability to rotate 360° without counterweight extension, combined with a lower entry price point, makes it the right choice for the most extreme space-constrained applications.
Both machines deliver Kubota’s legendary durability, fuel efficiency, and reliability. The right choice depends entirely on matching the machine’s strengths to your specific operational requirements.
Your Trusted Partner for Used Kubota Excavators: Taihongmachinery
At Taihongmachinery (TH Engineering Equipment Limited) , we specialize in connecting international buyers with high-quality used Kubota excavators, including both the KX163 and U55 models. With years of experience serving clients across Africa, the Middle East, Southeast Asia, and Latin America, we understand that choosing the right used excavator requires expert guidance.
Why Choose Taihongmachinery:
- Curated Inventory: We carefully inspect every used Kubota excavator before listing—verifying hour meters, engine performance, hydraulic function, and undercarriage wear against OEM standards.
- Transparent Condition Reports: We provide detailed photos, videos, and honest assessments—including cold start videos, hydraulic function tests, and wear measurements. No hidden surprises.
- Third-Party Inspections Welcome: We encourage independent inspections through SGS, Bureau Veritas, or other agencies. Our confidence means we have nothing to hide.
- Competitive Pricing: Our direct sourcing channels allow us to offer fair market prices—typically 15–25% below dealer retail.
- Full Export Support: From documentation to shipping coordination, our logistics team handles the complexities.
- After-Sales Assistance: Even after your used excavator arrives, we’re here to help with parts sourcing and technical support.
Whether you’re evaluating a used Kubota KX163 against a used Kubota U55 or comparing with other compact excavator brands, Taihongmachinery provides the expertise and transparency you need to make a confident investment.
