Fault Phenomenon: ZPMC ZP3000 floating crane during rotation, a periodic metallic impact sound comes from the swing bearing.

Troubleshooting Process:
– Checked swing bearing bolts: some bolts loose.
– Checked gear meshing clearance: excessive clearance.
– Checked raceway: found localized pitting.
– Tightened bolts and adjusted gear clearance; severe pitting requires replacement.

Root Cause: Loose swing bearing mounting bolts and excessive gear meshing clearance.

Required Parts: High-strength bolts, grease.