FM-20: FM-20 ABNORMAL GRINDING, RATTLING, OR SEVERE VIBRATION

Abnormal grinding, rattling, or severe vibration during operation indicating mechanical faults.

• Loose bar, cover, or handle hardware
• Chain is dry, loose, damaged, or off the sprocket
• Debris is trapped under the cover
• Worn drive sprocket or gearbox
• Motor bearing or internal housing fault

1. The saw runs with its normal sound and vibration and all external parts remain secure.

1.

This is a preview of the troubleshooting guidance included in the full repair manual.

• Motor or gearbox
• Drive sprocket or internal drive parts

• The saw makes new grinding, clacking, rattling, or strong vibration during no-load running or cutting.

  The saw makes new grinding, clacking, rattling, or strong 1. Release the trigger, remove the battery, and stop immediately if the sound is harsh,

• 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.