- If the new blade still rubs, the issue is often a warped rear cover or a worn fan motor bearing.
- Verify the blade is seated fully—partial seating causes wobble and noise.
- Don’t ignore shaft play; a failing motor will quickly damage the new blade.
- If you hear a “tick-tick” only at certain speeds, check for cover screws contacting the blade path.
- After install, run convection at 350°F for 5 minutes and listen for speed ramp stability.
- If the retaining nut is stubborn, use penetrating oil sparingly and avoid bending the shaft.
- Confirm you’re replacing the lower blade—some models have different upper/lower blade geometries.
- Any blade impact damage usually means something was loose—check the cover and motor mounts.
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