Module 9 sur 10 160m 160 min 11 exam Qs 11 exam questions covered
Noise & Vibration Diagnosis
Noise source identification, vibration causes, bearing failures, loose hardware, drive system noise, and sound transmission remedies.
- Identify noise sources by type and location
- Diagnose bearing wear and vibration causes
- Resolve drive system noise and sound transmission problems
Leçon 1
Noise Source Identification & Classification
Categorizing Garage Door Noises
Different noises point to different problems. Training your ear is one of the most valuable diagnostic skills.
| Sound | Location | Likely Cause |
|---|---|---|
| Grinding | Track area | Worn rollers, track misalignment |
| Clicking/popping | Hinges | Dry hinges, loose hinge bolts |
| Squealing | Drive system | Dry chain, worn belt |
| Banging | Full travel | Hitting limit too hard, loose panels |
| Rattling | Hardware | Loose nuts, bolts, or track hangers |
| Humming | Opener | Motor running without movement, gear issue |
Isolation Technique
To pinpoint a noise source, disconnect the opener and operate the door manually. If the noise persists, it is a door-side issue. If the noise disappears, it is an opener-side issue. This single test cuts your diagnostic time in half.
Key Takeaway
Different sounds indicate different problems. Use the manual operation test to isolate door-side vs. opener-side noise sources. Grinding = rollers/track, clicking = hinges, squealing = drive system, rattling = loose hardware.