Liebherr Fault Code
Free · no signup0x01D8
Engine Severe Lugdown / Black Smoke
System
Hydraulics / Main
Symptom
Engine Severe Lugdown / Black Smoke
Diagnosis & fix steps
LOGIC: Main Hydraulic Pump 1 Displacement Electronic Control Valve Stuck On.
ACTION: Inspect proportional pressure reducing valve (PPRV) spool on Rexroth A4VSO pump regulator for metal slivers or varnish. Measure solenoid driver current under neutral standby.
Red Seal field insights
Over-Stroke Physics: Debris jamming the pilot spool locks the axial piston pump at maximum swashplate angle, overloading engine torque output even with joysticks in neutral.
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