Cruncher G-18JX

Cruncher G-18JX

Extreme power – amazing production

Main advantage of the Cruncher (G-series) is the standard integrated booster system, a unique feature designed by NPK®. This booster system automatically activates whenever the jaws meet resistance. Compared to competitive crunchers without such a booster, the pressure intensifier system has a relatively low oil flow and produces faster cycle times and more crushing strength.

Additionally, other excavators functions remain uninfluenced. The integral booster allows a compact body design, reduces the total weight of the attachment and affords ease of maintenance.

The cruncher is specifically designed to reduce oversized concrete pieces from ground level after they have been demolished. Simultaneously the reinforced steel will be separated from the concrete on site! This results in a significant reduction of transport costs and recycling becomes much more efficient.

Bolt on Teeth

All models are equipped with a Tooth plate, leading to easier replacement. The cruncher can remain on site while the Tooth plate is changed or removed for refurbishment.

Down time is therefore kept to an absolute minimum, greatly enhancing production.


  • Standard integrated booster system that automatically activates when the jaws meet resistance.
  • Easy maintenance.
  • Bolt on Tooth plate: easy teeth replacement.
  • Large jaw opening.
  • Piston rod fully protected against damage.
  • Low oil flow – other functions of excavator are not influenced.
  • Short opening/closing time (3.2 sec.) in unloaded condition, produces 19 cycles a minute.
  • High productivity and extreme power.
  • Designed and produced by the world’s largest manufacturer of boom mounted attachments.
  • Standard rebar cutters.
  • No additional pressure reduction is required in the hydraulic system.
  • Worldwide sales and product support network.




Model NPK G-18JX
Excavator weight (ton) 17 – 22
Weight (kg) 2150
Max. jaw opening (mm) 823
Working pressure (MPa) 26
Oil flow (l/min) 100 – 200
Max. force (A) (kN) 820
Max. force (B) (kN) 1060

High Speed

Opening time (sec.) 0.9
Closing time (sec.) 2.3
Total cycle time (sec.) 3.2
Number of cycles (sec.) 19
Oil flow (l/min) 200


Cruncher G-18J


Concrete_Cruncher.pdf (276.61 kB)

Betonpulverisierer.pdf (278.46 kB)

Crocs_a_béton.pdf (281.34 kB)



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The NPK Powerbooster can be explained in 4 steps, as described above. As soon as the jaws meet resistance the extra speed is changed to extra power. Without concrete in the jaw, the booster creates more speed.

Read more about NPK technologies