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MB Series rock breakers.

MB Series

Rock breakers

MB Series rock breakers are complete functional packages for rock breaking in the primary crushing stage. The breaker booms and hammers are engineered to meet the requirements set by rough primary crushing applications. These packages are optimized to work together and support Metso Outotec primary crushers, ensuring the best productivity of the whole primary crushing station.

Reduction of oversized rocks

Breaks oversized rocks before they enter the primary crusher

Improves long-term plant production

Downtime can be easily cut to a minimum ensuring a steady material flow.

Operated by a remote-control unit

The Rock breaker can be operated from a safe distance with remote control.

Safe and easy to operate and maintain

Safe way to manage blockages and build-ups and to clear the crusher cavity.

Rock breaker for primary crushing applications

Metso Outotec rock breaker is a solution for primary crushing applications. They are most commonly used to break oversized rocks on top of the crusher cavity, to move single rocks which are stuck somewhere or to break build-ups caused by multiple coarse but not necessarily oversized rocks. Rock breakers are typically used to support the primary crusher, either jaw crushers or primary gyratories. Rock breakers can also be used to crush oversized boulders on top of the grids or grizzlies or to assist material flow in chute works or other possible challenging places in crushing processes.


Consist of following components: breaker boom, impact hammer, hydraulic power unit and radio remote control. Metso Outotec rock breakers are engineered and built tough for the demanding primary crushing applications to meet the same requirements as the crushers.

Rock breakers are operated by a remote-control unit. Same unit can be used as a radio remote unit or as a cable remote control unit depending on customer preference.

The remote-controlled boom and hammer with the radio remote control, which is part of standard scope of delivery, means that the boom and hammer can be operated from a location that gives the operator unlimited visibility into the area where the rocks are moved or broken.


Long-term plant production is significantly improved when the primary station is equipped with a rock breaker solution. Downtime due to build-ups and blockages can be easily cut to a minimum. This ensures a steady material flow through the primary station to the next process stages. The huge economic impact as a result of improved productivity means that the investment pay-back time is typically very short.

Each rock breaker is a complete optimized package which is dimensioned perfectly to operate smoothly as a package. Each package is optimized to support certain size jaw crusher or primary gyratory.


A rock breaker solution is clearly the safest way to manage blockages and build-ups and to clear the crusher cavity. Thanks to the remote controls the operator can operate the equipment from a location which is safe for the operator and from where the operator can easily see into the area where the rock breaker is operating. Remote controls and proportional valves ensure smooth, agile and accurate controls which is important for safe, quick and easy operation. Metso Outotec rock breaker solutions are also engineered safe and easy to maintain, with single-point lubrication of the boom joints as a standard feature.


  • Primary crushing station equipped with a jaw crusher or a primary gyratory crusher
  • Grid or grizzly application
  • To assist material flow in the chute works
  • Safe breaking of oversized materials
  • Safe clearing of build-ups, bridgings
  • Stationary, portable or mobile application
Check the video
Metso Rock Breakers help you to cut black belt time in your primary crushing process. They are a safer way to manage blockages and to clear build ups and the crusher cavity. Watch the video and learn why our Rock Breakers are a perfect match with your primary crushing operation.
How others have improved profitability and reduced risks?

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