Liebherr Fault Code
Free · no signupSPN 522104 FMI 5
Winch Lowers Slowly / Warning Active
System
Hydraulics / Winch
Symptom
Winch Lowers Slowly / Warning Active
Diagnosis & fix steps
LOGIC: Kelly Winch Slack Rope Proximity Switch Circuit Open.
ACTION: Inspect inductive proximity sensor gap on the winch drum frame (spec: 2–4 mm). Check 24V feed and signal return harness at mast junction box terminal block X60.
Red Seal field insights
Rope Spool Protection: Prevents cable nesting and bird-nesting on the drum by stopping winch feed down if tension drops off the wire rope.
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