Recycling and recovering

Star screening bucket

Three star shafts meshing with one another, their branches offset from one shaft to the next, with soil and stones caught between them. — The screening is decided by the spacing of the stars:
what passes between them is graded, the rest moves on.
Synthetic image.

Shafts fitted with rubber stars turn in opposite directions.
Where a grid clogs, the stars clean themselves — it is the tool for wet soil.

Other names for this tool: disc screening bucket, star screen, star separating bucket, rotor screening bucket, star screen.

The essentials

Family: Recycling and recovering
Classes (t): Mini-excavators
Coupler: We calculate it with you for your machine
Power source: Hydraulic, continuous function — flow and pressure: we calculate it with you for your machine

Compare with the screening bucket →

01 Use

What it is for

On the left, the stars clean themselves as they turn, the wet soil passes through and falls. On the right, the conventional grid blocks as soon as the soil is wet. Computer-generated image. — **Left:** the stars clean themselves as they turn, the wet soil passes through and falls.
**Right:** the conventional grid blocks as soon as the soil is wet.
What sets it apart:
the whole difference lies in the clogging — where a grid blocks, the stars clean themselves.
Computer-generated image.

**Left:** the stars clean themselves as they turn, the wet soil passes through and falls.
**Right:** the conventional grid blocks as soon as the soil is wet.
What sets it apart:
the whole difference lies in the clogging — where a grid blocks, the stars clean themselves.
Computer-generated image.

The bottom of the bucket is made up of parallel shafts carrying stars.
As they turn, they move the material forward and let what passes between them fall.
The oversize comes out at the front, the passing fraction falls below.

Topsoil, compost, clay spoil, ditch silt:
everything that is damp, sticky or fibrous.
That is precisely what the other screens cannot handle.

The whole difference lies in the clogging. A grid blocks as soon as the soil is damp, and you have to stop to clear it.
The stars, turning against one another, clean themselves continuously.
On a soil at 20% moisture, one works and the other does not.

02 What we check with you

On which machine?

They exist for machines from 1,8 to 50 t.
For example, on an excavator over 20 t, the weight is generally from 1 420 to 4 100 kg.
A star screening bucket is designed for mini-excavators.
The exact class and the coupler: we calculate them with you for your machine.

What the tool does

It is a tool for screening, recycling and recovering.
For example, for a width of 1 500 mm: capacity from 550 to 2 250 l, weight from 740 to 2 500 kg.
The bucket volume and its weight: we calculate them with you for your machine.

What is needed on the hydraulic side

It needs a continuous hydraulic function.
It generally needs from 25 to 280 l/min, at a pressure from 200 to 320 bar, depending on the size of the machine.
The flow, the pressure and the number of circuits: we calculate them with you for your machine.

Figures taken from 30 models on the market.
Your study sets the exact value for your machine.

All the measurements found for this equipment →

Don't have these figures?
A photo of the machine is enough to start.

03 Your study

Have your machine checked.

Give us your excavator model, the material to be screened and the particle size aimed at.
Above all, tell us in what season you work:
it is the moisture that separates the two families of screeners.

What we need to answer you

Your machine Its make and its tonnage.
The auxiliary circuit Its flow in l/min, its pressure in bar, single- or double-acting.
The coupler in place Its system and its class.
The work The use, and the material.

Without these details, the study still begins: we will ask you for them.

Send my photos

or describe your need

Book an appointment with the specialist

Or call 01 84 16 55 49 · our lines are open 7 days a week, from 7h to 22h.

Written study within 3 working days, once the file is complete.

04 Choice

What determines the choice

01 — The spacing between the stars It is what fixes the particle size of the passing fraction.
On some models it is adjusted by changing the speed of the shafts, on others the stars have to be changed.
The difference matters if you handle several materials.
02 — The real nature of the material The stars excel on the damp and the fibrous.
On dry, stony material or crushed concrete, a screening bucket in its classic form does better and costs less.
03 — The flow available, continuously The shafts turn throughout the cycle.
It is a tool with a continuous function, which makes demands on the hydraulics without interruption.
04 — The wear of the stars They are the consumable parts.
Whether they can be replaced one by one, without taking the shaft out, decides what a season costs.

It is not a variant of the screening bucket, it is another tool. The rotary screener is made for dry mineral material; the star screener for organic and damp material.
Choosing on the name rather than on the material is the most frequent mistake in this family.

05 Check

What is checked before ordering

The auxiliary line and its continuous flow First eliminating criterion. See the 7 criteria.
The moisture and the nature of the material It is the question to be answered before all the others.
The same soil in February and in August does not call for the same tool.
The operating weight, bucket full A screener works loaded, and damp material is heavy.
The interface Coupler type and size, or pin dimensions.
The tool is supplied with the matching plate — see the couplers.

In the same family

Before screening

On the interface

To go further

Family: Recycling and recovering
Trade: Agriculture
Trade: Landscaper
Classes: Mini-excavator, 2 to 5 t
Compatibility: The seven criteria in detail →