Chain Drive, Chain Brake, Chain - Stihl MS 661 Manual

3.2 Chain Drive, Chain Brake, Chain Tensioner
Condition
Chain sprocket wears rapidly
Saw chain stops under full load
Saw chain does not stop
immediately when brake is
activated
MS 661, MS 661 C-M
Cause
Chain not properly tensioned
Wrong chain pitch
Insufficient chain lubrication
Brake band blocked
Chain brake spring
stretched / broken
Brake band
stretched / worn / broken
Clutch drum worn
Remedy
Tension chain as specified
Fit chain of correct pitch
Check chain lubrication
Check freedom of movement and
operation of brake band
Fit new brake spring
Fit new brake band
Install new clutch drum
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