Stihl MS 171 Manual page 9

4. Troubleshooting
4.1 Clutch
Condition
Saw chain stops under load at full
throttle
Saw chain rotates at idle speed
Loud noises
8
All manuals and user guides at all-guides.com
Cause
Clutch shoes badly worn
Clutch drum badly worn
Engine idle speed too high
Clutch springs stretched or fatigued Replace the clutch springs or install
Clutch spring hooks broken
Clutch shoe bores worn
Clutch springs stretched or fatigued Replace all clutch springs
Needle cage damaged
Clutch shoe retainer broken
Clutch shoes and carrier worn
Remedy
Install new clutch
Install new clutch drum
Readjust with idle speed screw
(LA) (counterclockwise)
new clutch
Replace the clutch springs
Replace clutch shoes or install new
clutch
Fit new needle cage
Fit new retainer
Install new clutch
MS 171, MS 181, MS 211