Fault Phenomenon: Komatsu D275A dozer a dry grinding sound occurs during blade swing, ring gear wears quickly.

Troubleshooting Process:
– Checked lubrication points: grease fittings clogged or damaged.
– Checked grease: incorrect type of grease used.
– Checked auto-lube pump: pump not working or line broken.
– Checked seals: ring gear dust cover damaged, allowing debris entry.

Root Cause: A line in the automatic centralized lubrication system ruptured, preventing grease from reaching the ring gear, causing dry wear.

Required Parts: Repair lubrication line and apply specialized grease.