STIHL 064, 066 9
2. TROUBLESHOOTING
CHARTS
2.1 Clutch,
Chain Drive,
Chain Brake and
Chain Tensioner
Condition
Saw chain turns at
idle speed
Cause
Engine idle speed too high
Spring hook(s) broken
Remedy
Readjust at idle speed
adjustment screw
(counterclockwise)
Fit new spring(s)
Loud noises
Springs stretched or fatigued
Needle cage damaged
Clutch shoe retainer
broken
Clutch shoes and carrier
worn
Replace all clutch springs
Fit new needle cage
Fit new retainer
Fit new clutch
Chain sprocket wears
rapidly
Chain wears rapidly
Chain not properly
tensioned
Chain not properly
tensioned
Poor chain lubrication
rectify problem
Worn chain sprocket
Tension chain as specified
Tension chain as specified
Check chain lubrication and
Fit new sprocket
Chain does not stop
immediately when chain brake
is activated
Brake spring broken
Brake band stretched or
broken
Fit new brake spring
Fit new brake band
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