Fault Phenomenon: Zoomlion ZR360 rotary drilling rig rotary head swing bearing and gears have not been lubricated for a long time, producing dry grinding abnormal noise.

Troubleshooting Process:
– Checked lube pump: electric lube pump motor burnt or seized.
– Checked controller: timing control module faulty.
– Checked lines: grease supply line clogged or ruptured.
– Checked grease: grease hardened and dried.

Root Cause: The electric lube pump motor of the automatic centralized lubrication system burnt out, failing to inject grease into critical friction pairs on schedule.

Required Parts: Replace electric lube pump motor and clean lines.