Won't release
Often a stuck thruster piston, an unprimed hydraulic line, or a frozen rail clamp jaw after a salt-fog week. Inspect, free, and lubricate per OEM.
Won't engage
Stuck open spring stack — usually corrosion or contamination. Strip, clean, and replace springs if cracked.
Drift in wind
Worn jaw inserts or rail head deformation. Replace inserts; inspect rail head profile.
False alarm under operation
Limit switch out of adjustment or wear sensor over-sensitive. Recalibrate.