failure mode
FM-21: FM-21 GUIDE BAR, SAW CHAIN, SCABBARD, OR CUTTING ATTACHMENT IS DAMAGED
FM-21 GUIDE BAR, SAW CHAIN, SCABBARD, OR CUTTING ATTACHMENT IS DAMAGED
Diagnostic overview
FM-21 GUIDE BAR, SAW CHAIN, SCABBARD, OR CUTTING ATTACHMENT IS DAMAGED
Likely Root Causes
- Chain hit soil, stone, metal, or a hard foreign object
- Bar was bent in a pinch or impact
- Chain derailed or broke
- Wrong chain or bar was installed
- Scabbard was crushed, cut, or lost
Quick Checks
- for transport.
Repair Preview
- 1.
- Remove the battery and do not run the saw with a bent bar, cracked rail, broken link, missing FM-21
This is a preview of the troubleshooting guidance included in the full repair manual.
Common Fixes
- Low-kickback saw chain
- Reduced-kickback guide bar
- Guide-bar scabbard
Related symptoms
The bar is bent or cracked, chain links or cutters are broken, or the guide-bar scabbard is split, missing, or will not stay on.
The bar is bent or cracked, chain links or cutters are 1. Remove the battery and do not run the saw with a bent bar, cracked rail, broken link,
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.