Head to head
JCB 3CX vs Komatsu D51PX
The Komatsu D51PX is the bigger machine by 6,045kg.
Last reviewed 13 September 2026
Key differences
- Operating weight: the Komatsu D51PX is the bigger machine by 6,045kg.
Specifications side by side
| JCB 3CX | Komatsu D51PX | |
|---|---|---|
| Operating weight | 8,135kg standard and Contractor, 8,435kg on 3CX Super | 14,180kg |
| Dig depth | 4.24m with standard dipper, up to 5.46m with Extradig | - |
| Class | - | 14 tonne |
Sources: JCB 3CX, Komatsu D51PX. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 3CX if...
The machine most people picture when they think of a building site, and still the default where one machine has to both dig and load. Groundworkers and utilities contractors buy it precisely to avoid putting two machines on a small site.
Listed by
- TPH Plant Hire - Gravesend, Northfleet
- Red Plant Sales Ltd - Colchester, Frating
Buy or hire the D51PX if...
- you want one that is the bigger machine by 6,045kg
A mid-size dozer built with wider, low ground pressure tracks for soft or wet ground. Groundworks and landfill contractors choose the PX variant over a standard-track D51 where the ground itself would otherwise bog a machine down.
Listed by
- B & T Plant Hire - Gravesend
- B & T Plant Hire Ltd - Morden
Common questions
What is the difference between the JCB 3CX and the Komatsu D51PX?
The Komatsu D51PX is the bigger machine by 6,045kg. The JCB 3CX is a wheeled backhoe loader; the Komatsu D51PX is a low ground pressure crawler dozer, 14 tonne class.
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