Fault Phenomenon: Kalmar reach stacker after the spreader reaches the container, the twistlock indicator shows unlocked, unable to lift.

Troubleshooting Process:
– Checked twistlock cylinder: cylinder internal leakage.
– Checked twistlock mechanical structure: foreign object obstruction.
– Checked proximity switches: switch position offset.
– Cleared obstruction, adjusted switch position, replaced cylinder seals.

Root Cause: Twistlock mechanism obstruction and position detection switch misalignment.

Required Parts: Proximity switch, cylinder seals.