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.

The U-21JXR has an easy replaceable tooth plate on arm and frame. Due to these easy and quickly replaceable tooth plates, downtime has been reduced to a minimum.

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 – 250
Rotation pressure (MPa) 14
Rotation oil flow (l/min) 10 – 15
Max. force (A) (kN) 645
Max. force (B) (kN) 885


Model NPK U-21JXR
Opening time (sec) 0.6
Closing time (sec) 1.3
Total cycle time (sec) 1.9
Number of cycles (c/min) 32
Oil flow (l/min) 250



Concrete_Cruncher.pdf (989.55 KB)

Betonpulverisierer.pdf (988.24 KB)

Crocs_a_béton.pdf (426.21 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.

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