Fault Phenomenon: Komatsu WA470 wheel loader instrument displays hydraulic filter clogged alarm, actions slow.

Troubleshooting Process:
– Checked filter: return filter completely clogged with debris.
– Checked bypass valve: bypass valve not opened or spring broken.
– Checked oil sample: extremely high fluid contamination.
– Checked time: overdue for replacement.

Root Cause: The hydraulic return filter was not replaced for a long time; contaminant buildup caused complete blockage, resulting in high system back pressure.

Required Parts: Replace hydraulic return filter and hydraulic oil.