Fault Phenomenon: XCMG LW500 wheel loader all work equipment actions are slow and weak, and shifting is sluggish.

Troubleshooting Process:
– Checked pilot pump: pilot gear pump severe internal leakage.
– Checked pressure reducing valve: pilot circuit pressure reducing valve set too low or stuck.
– Checked filter: pilot oil filter clogged.
– Checked leakage: pilot lines or internal handle leakage.

Root Cause: The pilot circuit pressure reducing valve spool is stuck in the pressure relief position due to debris, preventing pilot pressure from building.

Required Parts: Clean or replace pilot pressure reducing valve.