9
MS 780, MS 880
4.
Troubleshooting
4.1
Clutch
Condition
Cause
Remedy
Saw chain stops under load at full
throttle
Clutch shoes badly worn
Install new clutch
Clutch drum badly worn
Install new clutch drum
Saw chain rotates at idle speed
Engine idle speed too high
Check carburetor settings and
readjust properly if necessary
Clutch springs stretched or fatigued Replace the clutch springs or install
new clutch
Clutch spring hooks broken
Replace the clutch springs
Loud noises
Clutch springs stretched or fatigued Replace all clutch springs
Needle cage damaged
Fit new needle cage
Clutch shoe retainer broken
Install new retainer or clutch
Clutch shoes and carrier worn
Install new clutch
