Stihl MS 311 User Manual - Page 10
Chain Drive, Chain Brake, Chain Tensioner
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3.2 Chain Drive, Chain Brake, Chain Tensioner Condition Chain sprocket wears rapidly Cause Chain not properly tensioned Wrong chain pitch Insufficient chain lubrication Chain sprocket worn Remedy Tension chain as specified Fit chain of correct pitch Check chain lubrication Fit new chain sprocket Saw chain stops under load at full Clutch shoes badly worn throttle Clutch drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 311, MS 391 9