Liebherr Fault Code
Free · no signupSPN 520290 FMI 14
Free-Fall Winch Interlock Active
System
Hydraulics / Winch
Symptom
Free-Fall Winch Interlock Active
Diagnosis & fix steps
LOGIC: Controlled Free-Fall Brake Pressure Sensor Implausible.
ACTION: Check brake pressure sensor zero-point offset key-on engine off (spec: 0.5V / 0 bar). Perform a hydraulic pressure test on the wet clutch brake release port.
Red Seal field insights
Safety Override: Prevents accidental clutch release; the crane controller blocks free-fall arming if residual hydraulic release pressure is detected while brakes are set.
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