Stihl MS 251 Instruction Manual - Page 10
Chain Drive, Chain Brake, Chain Tensioner, Replace the clutch springs or install - replace 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 Remedy Tension chain as specified Fit chain of correct pitch Check chain lubrication Saw chain stops under full load Clutch shoes badly worn 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 Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the clutch springs or install new clutch 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 231, MS 231 C, MS 251, MS 251 C 9