Head to head
Kubota U55-4 vs Yanmar ViO57-6B
The Yanmar ViO57-6B has 301kW more power and is the bigger machine by 85kg.
Last reviewed 13 September 2026
Key differences
- Engine power: the Yanmar ViO57-6B has 301kW more power.
- Operating weight: the Yanmar ViO57-6B is the bigger machine by 85kg.
Specifications side by side
| Kubota U55-4 | Yanmar ViO57-6B | |
|---|---|---|
| Operating weight | 5400kg | 5485 kg |
| Engine power | 46PS | 33,5 kW (at 2200 rpm) |
| Breakout force | - | 41,9 kN |
| Fuel tank | - | 66 l |
Sources: Kubota U55-4, Yanmar ViO57-6B. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the U55-4 if...
A midi excavator for groundworks, utilities and landscaping contractors. At 5.4 tonnes it arrives on a lorry rather than behind a car.
Listed by
- Yorkshire Plant Sales - Wakefield, Leeds
Buy or hire the ViO57-6B if...
- you want one that has 301kW more power
- you want one that is the bigger machine by 85kg
A 5 to 6 tonne zero-tail swing digger for civils and groundworks contractors on deeper trenching, pipe laying and loading. Hire fleets use it where space is tight but a bigger machine is needed.
Full ViO57-6B specifications →Common questions
What is the difference between the Kubota U55-4 and the Yanmar ViO57-6B?
The Yanmar ViO57-6B has 301kW more power and is the bigger machine by 85kg. The Kubota U55-4 is a midi excavator, 3 to 6 tonnes; the Yanmar ViO57-6B is a 5.5 tonne zero-tail mini excavator.
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