Cruncher U-21JXR

Cruncher U-21JXR

The crushing cruncher

Compared to NPK® G-series, the new U-21JXR cruncher shows important differences: one big center tooth and a center cutter. Because of the center tooth, all forces are concentrated to one point, which makes the U-cruncher act also as a crusher. Besides that, the new model has a relatively longer center cutter for cutting light steel structures, besides rebar. Another advantage is the 360 degrees hydraulic rotation, allowing great manoeuvrability. Together with the center tooth and cutter the U-21JXR cruncher is an ideal tool for crushing and cutting walls, floors and light steel structures, such as apartments, reinforced walls, etc.

High speed – extreme power

As all NPK® crushers and crunchers, the U-model has the standard integrated booster system, a unique feature designed by NPK®. This booster system automatically activates whenever the jaws meet resistance. This 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.


  • Standard integrated booster system that automatically activates when the jaws meet resistance.
  • Center tooth: more crushing power.
  • Hydraulic rotation 360° for precise positioning.
  • High productivity and extreme power.
  • Standard center cutter for rebar and light steel structures.
  • No additional pressure reduction is required in the hydraulic system.


Model NPK U-21JXR
Excavator weight (ton) 19 – 28
Weight (kg) 2325
Max. jaw opening (mm) 800
Working pressure (MPa) 26
Oil flow (l/min) 100 – 200
Rotation pressure (MPa) 14
Rotation oil flow (l/min) 10 – 15
Max. force (A) (kN) 645
Max. force (B) (kN) 885

High Speed

Opening time (sec.) 1.2
Closing time (sec.) 1.6
Total cycle time (sec.) 2.8
Number of cycles (sec.) 21
Oil flow (l/min) 200


Cruncher U-21JR


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