Komatsu Fault Code

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SPN 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.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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