Komatsu Fault Code
Free · no signupSPN 520285 FMI 14
Ripper Stalls / Low Penetration Force
System
Hydraulics
Symptom
Ripper Stalls / Low Penetration Force
Diagnosis & fix steps
LOGIC: Ripper Hydraulic Flow Merging Valve Mechanical Deviation.
ACTION: Connect hydraulic pressure gauges to the ripper control circuit. Inspect the pilot-operated merge spool inside the main rear valve block for scoring or contamination sticking.
Red Seal field insights
Hard-Ripping Logic: The controller commands dual-pump flow integration during deep ripper shank penetration; a sticky spool starves the ripper of full hydraulic power.
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