Fault Phenomenon: LiuGong 856 wheel loader during loading operation, a loud noise suddenly occurs, the bucket falls or the boom cannot move.

Troubleshooting Process:
– Checked pins: boom or bucket pivot pin broken.
– Checked material: pin material defect or improper heat treatment.
– Checked load: severe overload or off-center loading.
– Checked fatigue: long-term fatigue crack propagation.

Root Cause: The work equipment pivot pin broke due to long-term fatigue or material defect under impact load.

Required Parts: Replace with high-strength pivot pin, inspect pivot holes for deformation.