failure mode
FM-16: The Installed Blade Is Loose, Wobbles, Slips, Or Runs Off Center
After installation, the blade can shift at the spindle, visibly runs side-to-side, slips under load, or will not remain centered even though the motor turns.
Diagnostic overview
After installation, the blade can shift at the spindle, visibly runs side-to-side, slips under load, or will not remain centered even though the motor turns.
Likely Root Causes
- Wrong arbor size, blade diameter, blade type, or damaged blade plate
- Outer washer is reversed, missing, dirty, or not seated
- Clamping screw is loose or clamp/spindle surfaces are damaged
- Blade is bent, cracked, or mounted in the wrong rotation direction
Quick Checks
- With the battery removed, the blade is rigid at the spindle, rotates by hand without lateral runout or guard contact, and remains secure in one controlled cut.
Repair Preview
- Release the trigger at the first wobble or slip, wait for a full stop, remove the battery, and do not make another powered cut.
- Remove the blade and reject any bent, cracked, chipped, wrong-size, wrong-arbor, abrasive, or unsuitable blade.
- Clean the spindle and clamp area dry, inspect both washers and the clamping screw, and confirm the large flat washer face is against the blade with the bev
- Install a verified correct blade in the marked rotation direction and tighten firmly using the blade-lock and wrench procedure.
- - Hand-turn and visually check clearance and runout - if looseness, slip, or off-center rotation remains, stop and route the spindle/clamp system for authoriz
This is a preview of the troubleshooting guidance included in the full repair manual.
Common Fixes
- Wood-cutting circular saw blade
- Blade clamping screw or washer
- Gearcase, gears, bearings, or spindle
- Blade lock, blade wrench, clamping screw, and washers
- Lower blade guard, retracting lever, pivot, and spring
- Gearcase, gears, bearings, and spindle
- 7-1/4-inch wood-cutting blade
Related symptoms
The Installed Blade Is Loose, Wobbles, Slips, Or Runs Off Center
After installation, the blade can shift at the spindle, visibly runs side-to-side, slips under load, or will not remain centered even though the motor turns.
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.