Troubleshooting; Clutch - Stihl MS 661 Manual

3.

Troubleshooting

3.1

Clutch

Condition
Saw chain stops under full load
Saw chain runs while engine is
idling
Loud noises
8
Cause
Clutch shoes badly worn
Clutch drum badly worn
Engine idle speed too high
Clutch springs stretched
Clutch springs broken
Clutch springs stretched
Needle cage damaged
Clutch shoe retainer broken
Clutch shoes and carrier worn
Remedy
Install new clutch
Install new clutch drum
Depending on model: Readjust idle
speed screw LA or check M-Tronic
Replace the clutch springs or install
new clutch
Replace the clutch springs
Replace all clutch springs
Fit new needle cage
Install new retainer or clutch
Install new clutch
MS 661, MS 661 C-M