The substrate pump for businesses and professionals

A brief history

Once it was necessary to use cement mixers, wheel barrows, cranes or other types of lifting machinery to mix and transport floor screed. This meant low productivity and hard labour. Since more than twenty years Bunker has developed and produced floor screed mixer-transporters. By using this machine one saves both time and money.

High productivity at low cost

You always need floor screed conveyors characterized by extreme mobility that guarantee maximum reliability in constantly conveying the necessary materials. The conveyors running and maintenance costs must be low, they must be long-lasting and operate according to the relative safety and enviromental laws. The Tragen B250 EB is the right response to the needs of the modern days building site. It is equipped with a scraping device and loading skip which ensure high productivity.



The 4000 liter compressor permits the mixing and pumping of approximately 30 m3 of material in one day to a height of 80 m within a range of 180 m. The most varied mixes and floor screed materials can be used today in modern construction:

  • pure and bound expanded claypoly
  • normal and fine concrete with a maximum grain size of 16 mm
  • light concrete and sand
  • styrene, cork, gravel

It is not necessary to move the machinery around, even on the biggest building sites, everything is simple.

Technical Data

Thanks to our involvement in research and development and years of experience of building sites worldwide, we have managed to successfully project our concept of simplicity and reliability. As new customers you will experience this as have hundreds of other users.The length of the tragen has been reduced to a minimum, the weight has been controlled and its height is only 90 cm: these factors allow easy loading and positionning even in the narrow streets of old cities. The controls are all positioned on the same side of an electric board which is protected from sprays of water and allows easy control of all the machine’s functions highlighting them with lit bulbs and automatically blocking the electric motors in case of a drop in tension or the opening of the safety protection units. The machine also has an hour meter which helps to schedule work and maintenance.

The tank has been designed and tested to resist pressure and general wear and tear. It is prepared for hoses of different diameter and is fitted with a protective grid wich once opened blocks the mixer. The fast closing lid has a balanced spring and a robust vent valve, this safety feature stops if opening while in use. Inside the machine the mixer shaft is supported by special pads and durable washers. The mixing paddles are anti wear and tear resistant.

The floor screed which is loaded either manually or using the skip is mixed quickly, subsequently the flow of compressed air pushes it through the tubing to the pumping area.

With the floor screed mixture left to dry very quickly, a perfect mixture of gravel and binding agent must be guaranteed in order to achieve the best results and to create the fundamental chemical combination for low levels of humidity within a few hours. The form, number and positioning of mixing paddles have been improved for this.



B250 E B250 EB
Mixer motor Electric triphase Electric triphase
Type 230/400V 50Hz 230/400V 50Hz
Power 5,5 kW 5,5 kW
Skip motor Electric triphase
Type 230/400V 50Hz
Power 1,1 kW
Vessel capacity 270 l 270 l
Skip capacity 270 l
Scraping device Optional
Compressor (not incorporated)
Air delivery 2400 – 5000 l/min 2400 – 5000 l/min
Working pressure 7 bar 7 bar
Floor screed output* 3 m³/h 3-4 m³/h
Max granulometry** 20 mm 20 mm
Conveying distance 70 – 80 m 70 – 80 m
Horizontal* 120 m 120 m
Vertical* 80 m 80 m
Vessel outlet 60 – 65 – 100 Ø 60 – 65 – 100 Ø
Length 2750 mm 2920 mm
Width 1300 mm 1300 mm
Height 1340 mm 1340 mm
Weight 700 kg 880 kg

* Depending on air volume of compressor used
** Con tubazioni da Ø 100

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