Cruncher U-45JR

Cruncher U-45JR

The crushing cruncher

Compared to NPK® G-series, the new U-cruncher shows important differences: one big center tooth. 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 cutter for cutting light steel structures, besides rebar. Another advantage is the 360 degrees hydraulic rotation, allowing great manoeuvrability. The U-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

Like 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.
  • No additional pressure reduction is required in the hydraulic system.
  • 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 (5.4 sec.) in unloaded condition, produces 11 cycles a minute.
  • High productivity and extreme power.
  • Designed and produced by the world’s largest manufacturer of boom mounted attachments.
  • Standard rebar cutters.
  • Worldwide sales and product support network.


Model NPK U-45JR
Excavator weight (ton) 45 – 50
Weight (kg) 4560
Max. jaw opening (mm) 1130
Working pressure (MPa) 30
Oil flow (l/min) 175 – 275
Rotation pressure (MPa) 14
Rotation oil flow (l/min) 20 – 30
Max. force (A) (kN) 1260
Max. force (B) (kN) 1740

High Speed

Opening time (sec.) 2.4
Closing time (sec.) 3.0
Total cycle time (sec.) 5.4
Number of cycles (sec.) 11
Oil flow (l/min) 275


Cruncher U-45JR


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.

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