Safety & Efficiency with Height and Slew Restrictors

At Halo we continually seek ways to enhance safety and efficiency, and the integration of height and slew restrictors in excavators represents a significant advancement in achieving these goals.

Our Kobelco SK55SR 5t excavator is in the workshop getting these attached for an upcoming project.

What are Height and Slew Restrictors?

Height and slew restrictors are specialised safety devices installed in excavators. These restrictors serve as crucial control mechanisms, ensuring that the excavator’s movements stay within predefined limits.

Height Restrictors: These devices limit the maximum height to which the excavator’s arm can be raised. This is particularly vital in areas with overhead hazards like power lines or when working inside structures with height limitations.

Slew Restrictors: Slew restrictors control the rotational movement of the excavator. This is essential in confined spaces or near roads and pedestrian areas, preventing the excavator from swinging into traffic or endangering workers nearby.

Halo Civil Innovation Height and Slew Kobelco SK55SR 5t excavator

Applications in Construction

These restrictors find their utility in a variety of construction scenarios:

  • Urban Construction: In densely populated urban areas, where space is limited and safety is paramount, these restrictors ensure that the excavator operates within a safe range, avoiding potential accidents with buildings, vehicles, and pedestrians.
  • Utility Works: When working near live utilities, height restrictors can prevent accidental contact with overhead power lines, significantly reducing the risk of electrocution.
  • Controlled Demolition: During demolition projects, slew restrictors help in controlling the direction of the excavator’s movements, ensuring debris falls within a designated area.



  • Enhanced Safety: By controlling the excavator’s range of motion, these devices significantly reduce the risk of accidents, ensuring the safety of both operators and bystanders.
  • Compliance with Safety Regulations: They assist construction companies in complying with safety regulations and guidelines, which is essential for legal and insurance purposes.
  • Increased Efficiency: Restrictors can improve operational efficiency by allowing operators to focus on their tasks without worrying about overextending the machine’s capabilities.


The adoption of height and slew restrictors in excavators symbolises halo ‘commitment to safety and efficiency in the construction industry. These devices not only safeguard the well-being of our workers and the public but also enhance the overall productivity and compliance of our projects.

As technology evolves, such innovations will continue to shape a safer and more efficient future in construction.



If you need height and slew, machine control or tilt rotators on your project to increase safety and efficiency, contact Halo Civil Engineering.

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