Liebherr Fault Code

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SPN 520280 FMI 14

Rotary Head Speed Limit / Torque Drop

System

Hydraulics

Symptom

Rotary Head Speed Limit / Torque Drop

Diagnosis & fix steps

LOGIC: Auxiliary Hydraulic Pump Proportional Pressure Valve Override Active. ACTION: Check 24V PWM driver output from Litronic U47 module. Connect mechanical gauge to pump displacement control port to verify swashplate stroke.

Red Seal field insights

Hydraulic Logic: Protects variable displacement auxiliary pumps from cavitation when operating high-torque auger/Kelly drive attachments under extreme resistance.

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