Configuration studies
An attachment performs only if it is matched to its carrier. The catalogue says what a tool does; it never says whether it will do it on your machine.
Here we start from a machine and look at what it can carry.
The other page starts from the site:
a job to be done, and what is
deduced from it — ten cases, ten lines of reasoning.
The two tell the same work from both ends.
Here are four configurations, explained all the way through:
what is asked, what
constrains, what decides. These are practical cases met by us or
by one of our partners. We name neither the companies nor the
equipment:
what counts here are the characteristics and the reasoning that
goes with them.
They are not there to show off know-how.
They are there so that
you can go through the reasoning yourself.
the machine first, the tool afterwards. Tonnage, coupler, flow and pressure are read on site, and it is that reading which decides — not the catalogue.
Synthetic image.
A pruning disc on a 1.5 to 3.5 t mini-excavator
The need. Fitting a pruning disc to a light machine, without losing reach or stability.
-
What constrains — the hydraulics
A constant flow in the order of 40 to 60 l/min.
⚠ This is not a peak flow:
it is a sustained flow. A line that reaches the figure without holding it is not enough. - What constrains — the interface At these tonnages, the coupler is often proprietary to the machine's manufacturer — see why couplers diverge.
What decides:
weight, and nothing else. A 550 mm disc
cutting up to 150 mm exists in several weights depending on the make.
On a
1.5 to 3.5 t machine, the difference between 55 and 80 kg is not decided
by cutting performance:
it is decided by what happens with the arm extended, at
height.
The reasoning to take away: on a mini-excavator, the weight-to-power ratio comes before everything else. A better-performing but heavier tool does less work, because it works from less far out.
A hydraulic drum cutter on an 8 t excavator
The need. Slot cutting or precision excavation on a mid-tonnage carrier.
-
What constrains — the pressure
Up to 400 bar.
A lower working pressure does not make the tool work more slowly:
it stops it biting at all. - What constrains — the coupling A mounting plate specific to the machine's quick-change system.
What decides:
torque, not the stated power. A
twin-motor cutter develops around twice the rotation torque of
a single-motor cutter of comparable power.
On a 405 mm drum
fitted with 32 picks, in compact material, it is torque that
determines whether the cutter bites or slips.
⚠ And the opposite constraint, the one people forget:
an 8 t arm has
limits. A more powerful cutter is no progress if it exceeds
what the carrier can take.
The reasoning to take away: you are not looking for the most powerful cutter, you are looking for the highest torque that stays within the limits of the arm. The tool's page.
A 360° rotation on an 8 t tool carrier
The need. Giving the tool complete freedom of orientation, without changing machine.
-
What constrains — the oil passage
The oil must keep flowing through a rotary joint,
in the order of 52 l/min. ⚠ That is the delicate point of any rotating
module:
the rotation must not throttle the flow intended for the final tool. - What constrains — the rotation torque About 3,000 Nm at 175 bar to orient a tool of this category under load.
What decides:
the configuration of the interface, above as well as
below. A rotation module is supplied bare, and is
configured:
above, the machine's coupler; below, the tool's
interface. It is that double configuration that makes one and the same module
serve one machine or another — and it is also what makes it
transferable from one carrier to another.
The reasoning to take away: a rotating module is not bought, it is configured. The question is not “which one”, it is “with what above and what below”.
Heavy drilling on a 7 to 8 t excavator
The need. Drilling vertically in varied soils, with a high torque requirement.
- What constrains — the pressure Peaks around 240 bar.
- What constrains — the fixing A 75 mm square drive for the large-diameter augers.
- What constrains — the flow In the order of 80 to 115 l/min, regulated.
What decides:
not drowning the hydraulic motor.
⚠ That is the trap peculiar to drilling at this tonnage.
You naturally reason in
torque — a great deal is needed, in the order of 6,000 Nm for a large-diameter
auger — and you then choose a bigger motor.
That is
the mistake.
A planetary gear motor multiplies force by the reduction, not by the displacement. It obtains the torque without demanding from the excavator's circuit a flow it cannot supply.
The reasoning to take away: on a small machine, you look for reduction, not displacement. A motor bigger than the excavator can feed runs badly — and it overheats. The tool's page.
In all four cases, what decides is not the tool
It is the meeting between the tool and the carrier.
| Configuration | What people think | What decides |
|---|---|---|
| Pruning on a mini-excavator | cutting capacity | weight at full extension |
| Drum cutter on an 8 t excavator | power | torque, within the limits of the arm |
| 360° rotation | the module | the interface above and below |
| Heavy drilling | motor size | reduction, not displacement |
You will notice that no brand is mentioned on this page.
That is not
an oversight:
what decides is read in the characteristics, never on
the label.
The values given here are orders of magnitude taken from real
configurations, not product specifications.
They
serve the reasoning; they do not replace the manufacturer's data sheet.
That is why we always ask the same questions before
proposing anything at all:
which machine, which coupler, and what flow
comes out of your auxiliary line. These are not
administrative questions — they are the only three that decide.
Is your configuration not in the list?
That is normal:
there are as many as there are machines. Describe the
work to be done and give us the machine — or simply
a photo of the end of the dipper arm, which on its own answers
half the questions.
Written study within 3 working days, complete file.
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