Fault Phenomenon: Komatsu D375A dozer while driving, one track suddenly stops, accompanied by a loud metallic breaking sound.

Troubleshooting Process:
– Checked final drive: disassembly revealed planetary gear broken.
– Checked lubrication: gear oil contained large amounts of metal debris.
– Checked bearings: planet carrier bearings severely worn.
– Checked load: recent severe overload or impact operations.

Root Cause: The final drive planetary gear broke due to fatigue or instantaneous impact overload, seizing the entire drive system.

Required Parts: Replace final drive planetary gear set, planet carrier, and bearings; thoroughly clean final drive housing.