Short answer
A mini excavator works where a large machine cannot go: interior refurbishment, basements, courtyards, narrow streets, barns and greenhouses. The HKM attachment range starts at 0.7-tonne carriers, and in that class breakers, augers, grapples, rippers and small concrete cutters are genuinely usable. The realistic expectation is this: a mini does the same job more slowly, but it does it where a large machine could not work at all. The constraint is often not tonnage but the flow the attachment line delivers.
Attachments that genuinely work in the mini class
- Breaker: the most common use. Indoor concrete breaking, floor removal, foundation work. Because small breakers work in dusty enclosed spaces, lubrication and dust management matter more here.
- Auger: gardens, fence posts, tree planting, light foundations. One of the most productive attachments in the class.
- Grapple: clearing rubble, building stone walls, handling timber and pipe. It takes work done by hand into the machine.
- Ripper: frozen or compacted ground. Needing no hydraulics, it does not touch the limited flow of a mini machine, which is a real advantage in this class.
- Small concrete cutters and pulverisers: for controlled indoor dismantling. The tonnage limit bites harder here.
The real constraint is hydraulic, not tonnage
On minis, the flow delivered to the attachment line matters as much as tonnage, often more. The pump on a small machine is limited, and the share allocated to the attachment line is smaller still.
So "the tonnage fits but it does not work" is a common situation in this class. A breaker goes on, the tonnage is right, but because flow is below the range it strikes slowly and produces little.
On some minis the attachment line is not factory-fitted but added later. If diameter and valve are not chosen correctly on a retrofitted line, actual flow stays below the paper figure.
If you enter flow as well as tonnage in the selector, models that match your tonnage but not your flow appear under a separate heading. In the mini class that distinction is especially useful.
Have it measured before you buy
Having the actual flow of the attachment line measured is the most valuable thing to do before choosing an attachment for a mini. The manual figure is often not valid for a retrofitted line. Your service can measure it quickly, and it prevents buying the wrong attachment.
What indoor and enclosed work demands
- Dust: in an enclosed volume dust stays airborne. Dust channel tools and water suppression give disproportionate benefit in this class.
- Noise and vibration: where occupied structures adjoin, drum cutters or controlled dismantling methods come into consideration.
- Floor loading: working in basements and on slabs, machine and rubble weight have to be calculated together.
- The route out: unless you plan from the start how broken material leaves, the job jams at the haulage stage rather than the breaking stage.
- Ventilation: running a diesel machine in an enclosed space requires ventilation, and that is part of the programme.
A realistic expectation
A mini does the same work more slowly than a large machine. That is not a shortcoming but the definition of the class. The value is not in speed but in access: it gets where the large machine cannot and makes the job possible.
So in the mini class the right question is not "how fast" but "how else would we have done this". The alternative is usually breaking by hand or dismantling part of the structure, and both cost more.
The same logic applies to choosing attachments: rather than the largest attachment that will fit a mini, choose the one that will finish the job. An attachment working at its limit tires both itself and the machine.