Stihl 029, 039 - 2. TROUBLESHOOTING CHARTS; 2.1 Clutch, Chain Drive, Chain Brake and Chain Tensioner

STIHL 029, 039 7
Condition Cause Remedy
Saw chain turns at idle speed Engine idle speed too high Readjust at idle speed
adjusting screw
(counterclockwise)
Spring hooks broken Fit new springs
Loud noises Clutch springs stretched or Replace all clutch springs
fatigued
Needle cage damaged Fit new needle cage
Clutch shoe retainer broken Fit new retainer
Clutch shoes and carrier Fit new clutch
worn
Chain sprocket wears Chain not properly Tension chain as specified
rapidly tensioned
Chain wears rapidly Chain not properly Tension chain as specified
tensioned
Poor chain lubrication Check chain lubrication and
rectify problem
Worn chain sprocket Fit new sprocket
Chain does not stop Brake spring broken Fit new brake spring
immediately when brake is
activated Brake band stretched or Fit new brake band
broken
2. TROUBLESHOOTING
CHARTS
2.1 Clutch,
Chain Drive,
Chain Brake and
Chain Tensioner