10 Years of Repairing Air Compressors: The Little-Known "Golden Rules" I Only Dare to Share Now(Part 5）

Guide to Identifying Unusual Noises: Not All Sounds Require Disassembly

Disassembling immediately after hearing abnormal noise leads to over-maintenance—a "clicking sound" usually means the belt tensioner lacks oil (solve with 3 drops of sewing machine oil); "buzzing + vibration" requires testing with a phone app: replace bearings within 72 hours only if vibration exceeds 2.5mm/s.​

Case Example：A mold factory mistakenly took belt tensioner noise as main engine failure, losing ¥8000 on disassembly—actually only a ¥20 bearing replacement was needed.