Stihl MS 261 User Manual page 10

3.2 Chain Drive, Chain Brake, Chain Tensioner
Condition
Chain sprocket wears rapidly
Saw chain stops under full load
Saw chain rotates at idle speed
Saw chain does not stop
immediately when brake is
activated
MS 261, MS 261 C
Cause
Chain not properly tensioned
Wrong chain pitch
Insufficient chain lubrication
Clutch shoes badly worn
Clutch drum badly worn
Brake band blocked
Engine idle speed too high
Clutch springs stretched
Clutch springs broken
Brake spring stretched or broken
Brake band stretched or worn
Clutch drum worn
Remedy
Tension chain as specified
Fit chain of correct pitch
Check chain lubrication
Install new clutch
Install new clutch drum
Check freedom of movement and
operation of brake band
Readjust idle speed screw LA
Replace the clutch springs or install
new clutch
Replace the clutch springs
Fit new brake spring
Fit new brake band
Install new clutch drum
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