The Challenge: Invisible Wear at Great Heights

The main hoists of STS cranes operate under extreme load cycles. Inspecting the barrel couplings installed in these systems is traditionally complex and dangerous, requiring access at great heights and often necessitating facility downtime. A further issue: Misalignment in the drive train often goes unnoticed during visual inspections but can drastically reduce coupling service life. This was exactly the scenario threatening a main hoist at HHLA.

The Solution: Continuous Precision Monitoring

To make the condition of the couplings transparent, HHLA installed the MALMEDIE® LifeMonitor. Sensors continuously record the wear status with a precision of up to 0.1 mm.

The data analysis revealed an immediate need for action:

  • Left Coupling: Extreme wear of approx. 8 mm per year. Without intervention, this would have meant a remaining service life of less than one year.
  • Right Coupling: Also showed elevated wear, unnecessarily shortening operating time.

Precision over risk: The LifeMonitor records the wear status directly on the barrel coupling—without any manual intervention.

The Solution: Targeted Service Instead of Unplanned Downtime

Based on the alarming data, the MALMEDIE Service Team performed a MIC-Check in April and realigned the drive system. The effect was immediately visible on the LifeMonitor dashboard.

Before-and-After Effect: The chart shows the steep rise in wear caused by misalignment (left) and the immediate stabilization following the MALMEDIE Service intervention (right).

The Result: 5 Years of Service Life Secured

The realignment brought the wear rate almost to a halt. The data proves the success impressively:

  • Wear Reduction: From a critical 8 mm/year down to a minimal 0.42 mm/year.
  • Life Extension: The projected remaining service life of the affected coupling increased from just a few months to 5 years.
  • Reliability: The right coupling now theoretically achieves up to 20 years of service life (in new condition).

Conclusion

With the LifeMonitor, HHLA successfully shifted from reactive maintenance (“repair on failure”) to a predictive maintenance strategy. This saves costs, increases personnel safety, and ensures that the cranes at the Port of Hamburg operate reliably.