symptom
Abnormal drive-contact noise occurs while the pad turns
A repeatable grinding or scraping sound comes from beneath the tool while the pad turns.
What this symptom means
A repeatable grinding or scraping sound comes from beneath the tool while the pad turns.
Likely Root Causes
- Pad or dust skirt is rubbing
- Belt is damaged or misrouted
- Drive bearing or eccentric is failing
- Debris entered the pad/drive clearance
Quick Checks
- The drive turns quietly after an external rub is corrected, or the tool is removed from service.
Repair Preview
- Set O, remove the battery immediately, and do not repeat the noise under load.
- Remove the disc and inspect pad, skirt, four screws, and accessible clearance for rubbing debris.
- - Rotate the pad by hand
- - Correct only a proven external rub
This is a preview of the troubleshooting guidance included in the full repair manual.
Related failure modes
Included in the full manual
- root cause analysis
- tools needed
- step-by-step repair procedure
- diagrams
- exploded views
- post-repair checks
Public pages show a preview only. Purchase the full manual to download complete repair steps, diagrams, and verification procedures.
Related symptoms and error codes
Related models
Common symptoms
- No response when the switch is set to I
- Sander stops and restarts with the switch left at I
- On/off switch travel is blocked
- Powered motion continues after the switch is set to O
- Battery will not slide fully onto the tool rails
- Battery seats but will not latch
- Latched battery will not release
- Speed dial will not turn through its range