Fault Phenomenon: Kobelco tower crane within normal load range, the moment limiter frequently cuts off hoisting and luffing actions.

Troubleshooting Process:
– Checked load sensor: sensor drifted.
– Checked radius sensor: potentiometer worn, poor contact.
– Recalibrated moment limiter, replaced radius sensor.

Root Cause: The radius detection potentiometer wore out, causing signal jumps and falsely triggering overload protection.

Required Parts: Radius sensor (potentiometer).