Komatsu Fault Code
Free · no signupSPN 520950 FMI 00
Reduced Digging Force / Motor Temp Warning
System
Thermal / Motor
Symptom
Reduced Digging Force / Motor Temp Warning
Diagnosis & fix steps
LOGIC: Electric Drive Motor Stator Winding Temperature Exceeds Limit.
ACTION: Check PT100/KTY temperature sensor resistance inside motor stator pigtail. Inspect liquid cooling sleeve flow rate and check for scale buildup or collapsed rubber hoses on the motor coolant jacket.
Red Seal field insights
Copper Breakdown: Overloading electric motors under prolonged digging cycles drives stator winding temperatures past 150°C, risking insulation varnish breakdown and phase-to-phase shorts.
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