Fault Phenomenon: Komatsu WA470 wheel loader a loud abnormal noise comes from the drive axle when turning, normal when driving straight.

Troubleshooting Process:
– Checked differential: planetary or side gears worn, broken teeth.
– Checked bearings: differential case bearings loose.
– Checked lubrication: insufficient or deteriorated gear oil.
– Checked tires: significant diameter difference between left and right tires.

Root Cause: The differential planetary gear teeth broke due to long-term oil starvation or overload, causing abnormal noise during turning due to inability to differentiate speed normally.

Required Parts: Replace differential gear set and bearings.